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function calling between sources

This is a discussion on function calling between sources within the C++ Programming forums, part of the General Programming Boards category; ok i have main.cpp which loads functions from a dll have another second.cpp how do i use functions from main.cpp ...

  1. #1
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    function calling between sources

    ok i have main.cpp which loads functions from a dll

    have another second.cpp

    how do i use functions from main.cpp in second.cpp

    or do i have to have main.cpp free the dll, and have second.cpp load the dll like main already did?

  2. #2
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    There are some variations depending on your target system and build environment, but generally speaking.

    1) Place declarations in a header file (say, main.h) of functions in main.cpp

    2) #include "main.h" in second.cpp, preferably after #include'ing any standard header files.

    3) Within second.cpp, call functions declared in main.h to your hearts content. Ensure you get types of function arguments, return types, and calling conventions right (note: if you have not specifically monkeyed with calling conventions, the only requirement to get calling conventions right is to use compatible compilers).

    4) When building the executable, ensure the object files (main.o and second.o) are both included in the link. If usage of main.cpp requires use of a particular library, then also include that library in the link.


    If your intent is to directly call functions in the DLL, then second.cpp needs to use the same technique as main.cpp does.

    I've kept my answer generic - if you want a specific answer to your situation, you need to be specific in your question.
    Right 98% of the time, and don't care about the other 3%.

    If I seem grumpy or unhelpful in reply to you, or tell you you need to demonstrate more effort before you can expect help, it is likely you deserve it. Suck it up, Sunshine, and read this, this, and this before posting again.

  3. #3
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    ok, just have the dll i am calling the functions in/from so no header

    when i do the exact as main.cpp in the seond.cpp i get errors that they are already defined in main.obj.

    basically i am using a vellman k8055 card, with its supplied dll

    in main i have it loading the dll and taking the functions from it, like opencard();

    but in the second.cpp (a dialog box) i need to use for example SetDigitalChannel();

    how do i get second.cpp to use the function that main.cpp already "loaded"?

    i am used to single source console programs, i am jumping into gui with multiple CPP and UI files in QT....

    good news is i did manage to find out how to get dialog to send an int back to main!!!

  4. #4
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    Quote Originally Posted by Crossfire View Post
    when i do the exact as main.cpp in the seond.cpp i get errors that they are already defined in main.obj.
    That means you are duplicating function definitions (i.e. both source files implement a particular function). Remove the duplicates from one of your source files, recompile, and relink.

    Beyond that, you will need to read the documentation that came with your card and DLL. Generally, it makes no difference how many object files call functions in a DLL - as long as the linker can resolve the calls (or, if you are dynamically loading the DLL, your program can resolve functions at run time - but, from what little you have described, you are not doing that).
    Right 98% of the time, and don't care about the other 3%.

    If I seem grumpy or unhelpful in reply to you, or tell you you need to demonstrate more effort before you can expect help, it is likely you deserve it. Suck it up, Sunshine, and read this, this, and this before posting again.

  5. #5
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    well the functions are being called in main.cpp, and working, but i dont know how to call the functions in main.cpp FROM my second.cpp

  6. #6
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    Did you actually read my first post?
    stahta01 likes this.
    Right 98% of the time, and don't care about the other 3%.

    If I seem grumpy or unhelpful in reply to you, or tell you you need to demonstrate more effort before you can expect help, it is likely you deserve it. Suck it up, Sunshine, and read this, this, and this before posting again.

  7. #7
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    yeah
    1 dont have a header, no idea how to make a header from a dll. although i would love to strip out a dll and just place the functions right into my program instead of using a dll
    2 when i try to call everything in main and in second, i get duplication errors

    other then that, no idea what to do.

  8. #8
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    You don't make a header file from a DLL, and you don't need to - and I never suggested you need to. If a header file is needed to use a DLL, they will be supplied together - and, to get main.cpp working with it, you would have used that already if needed.

    You stated that you are seeking to call functions in main.cpp from second.cpp. To support that, you create - with your text editor or IDE, a header file with the appropriate function declarations (so the compiler has visibility of the function declarations when compiling both source files). Then you ensure that the functions are only implemented in one of the source files, not in both - if you don't do that, you get error messages about duplicated symbols from the linker. A function entry point is associated with a symbol. If you implement a function twice, the symbol is duplicated.

    The fact that main.cpp is using the DLL is absolutely irrelevant.


    The real problem is that you are just hacking together your main.cpp and second.cpp. They way you're doing it would get the same problem (duplicated symbols) even if you weren't using a DLL. It so happens main.cpp is using functions from a DLL, and you are assuming "oh, the problem is with the DLL, not the way I've hacked things".
    Right 98% of the time, and don't care about the other 3%.

    If I seem grumpy or unhelpful in reply to you, or tell you you need to demonstrate more effort before you can expect help, it is likely you deserve it. Suck it up, Sunshine, and read this, this, and this before posting again.

  9. #9
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    well not hacking together, main.cpp is the main, second is the dialog box where you can "choose" an address for the connection to the card. trying to get the dialog to check if it can open the card, and if not warn the user, if so then open card and then close the dialog. Main will be doing all the functions, just need to pass the "opendevice" function to the dialog.

    never said any prob was with the dll, just back to orig question, how do i call the function in main, from the second.cpp (the dialog).

    making the declarations of the functions in a header sounds like it will work, and will try it asap.

    thank you

  10. #10
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    Quote Originally Posted by Crossfire View Post
    never said any prob was with the dll, just back to orig question, how do i call the function in main, from the second.cpp (the dialog).
    That "orig question" is exactly what I answered in the second post of this thread. You're the one who kept associating things (in your opening posts, and subsequent replies) with the DLL, as if that was causing some other difficulty - at the same time as providing other information that indicated the DLL wasn't causing your problem.

    Quote Originally Posted by Crossfire View Post
    making the declarations of the functions in a header sounds like it will work, and will try it asap.
    Hoorah.

    Quote Originally Posted by Crossfire View Post
    Main will be doing all the functions, just need to pass the "opendevice" function to the dialog.
    If main.cpp is implementing the "opendevice" function, then all that is needed is for the compiler to see a declaration of "opendevice" when compiling second.cpp. A header file providing said declaration is a common technique to achieve that.

    If "opendevice" is a variable (say, a pointer to a function that main.cpp obtains from the dll) then the same answer applies. A declaration of "opendevice" in a header file, which is #include'd by both main.cpp and second.cpp, is sufficient.

    In other words, the first post I made in this thread provided the answer.
    Right 98% of the time, and don't care about the other 3%.

    If I seem grumpy or unhelpful in reply to you, or tell you you need to demonstrate more effort before you can expect help, it is likely you deserve it. Suck it up, Sunshine, and read this, this, and this before posting again.

  11. #11
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    ok made header
    Code:
    intOpenDevice(intCardAddress);
    
    voidCloseDevice();
    
    intSearchDevices();
    
    intSetCurrentDevice(intlngCardAddress);
    
    intVersion();
    
    intReadAnalogChannel(intChannel);
    
    voidReadAllAnalog(int*Data1,int*Data2);
    
    voidOutputAnalogChannel(intChannel,intData);
    
    voidOutputAllAnalog(intData1,intData2);
    
    voidClearAnalogChannel(intChannel);
    
    voidClearAllAnalog();
    
    voidSetAnalogChannel(intChannel);
    
    voidSetAllAnalog();
    
    voidWriteAllDigital(intData);
    
    voidClearDigitalChannel(intChannel);
    
    voidClearAllDigital();
    
    voidSetDigitalChannel(intChannel);
    
    voidSetAllDigital();
    
    boolReadDigitalChannel(intChannel);
    
    intReadAllDigital();
    
    voidResetCounter(intCounterNr);
    
    intReadCounter(intCounterNr);
    
    voidSetCounterDebounceTime(intCounterNr,intDebounceTime);
    
    intReadBackDigitalOut();
    
    voidReadBackAnalogOut(int*Buffer);
    in main.cpp, before the main code
    Code:
    #include"relaypanel.h"
    
    #include"ui_relaypanel.h"
    
    #include<QApplication>
    
    #include<QtCore>
    
    #include<QtGui>
    
    #include<windows.h>
    
    #include"cardselect.h"
    
    #include"k8055.h"
    
    
    
    
    typedefvoid(CALLBACK*t_func)(int);
    
    typedefvoid(CALLBACK*t_func0)();
    
    typedefint(CALLBACK*t_func1)();
    
    typedefvoid(CALLBACK*t_func2)(int*,int*);
    
    typedefvoid(CALLBACK*t_func3)(int,int);
    
    typedefint(CALLBACK*t_func4)(int);
    
    typedefbool(CALLBACK*t_func5)(int);
    
    
    
    
    t_func4OpenDevice;
    
    t_func0CloseDevice;
    
    t_func0Version_;
    
    t_func4ReadAnalogChannel;
    
    t_func2ReadAllAnalog;
    
    t_func3OutputAnalogChannel;
    
    t_func3OutputAllAnalog;
    
    t_funcClearAnalogChannel;
    
    t_func0ClearAllAnalog;
    
    t_funcSetAnalogChannel;
    
    t_func0SetAllAnalog;
    
    t_funcWriteAllDigital;
    
    t_funcClearDigitalChannel;
    
    t_func0ClearAllDigital;
    
    t_funcSetDigitalChannel;
    
    t_func0SetAllDigital;
    
    t_func5ReadDigitalChannel;
    
    t_func1ReadAllDigital;
    intinit(void);
    
    HINSTANCEhDLL;
    inth=init();
    after main

    Code:
    intinit(void)
    
    {
    
    hDLL=LoadLibrary((LPCWSTR)L"k8055d");
    
    if(hDLL!=NULL)
    
    {
    
    OpenDevice=(t_func4)GetProcAddress(hDLL,"OpenDevice");
    
    if(!OpenDevice)
    
    {// handle the error
    
    FreeLibrary(hDLL);
    
    return-2;
    
    }
    
    CloseDevice=(t_func0)GetProcAddress(hDLL,"CloseDevice");
    
    if(!CloseDevice)
    
    {// handle the error
    
    FreeLibrary(hDLL);
    
    return-2;
    
    }
    
    ReadAnalogChannel=(t_func4)GetProcAddress(hDLL,"ReadAnalogChannel");
    
    if(!ReadAnalogChannel)
    
    {// handle the error
    
    FreeLibrary(hDLL);
    
    return-2;
    
    }
    
    ReadAllAnalog=(t_func2)GetProcAddress(hDLL,"ReadAllAnalog");
    
    if(!ReadAllAnalog)
    
    {// handle the error
    
    FreeLibrary(hDLL);
    
    return-2;
    
    }
    
    OutputAnalogChannel=(t_func3)GetProcAddress(hDLL,"OutputAnalogChannel");
    
    if(!OutputAnalogChannel)
    
    {// handle the error
    
    FreeLibrary(hDLL);
    
    return-2;
    
    }
    
    OutputAllAnalog=(t_func3)GetProcAddress(hDLL,"OutputAllAnalog");
    
    if(!OutputAllAnalog)
    
    {// handle the error
    
    FreeLibrary(hDLL);
    
    return-2;
    
    }
    
    ClearAnalogChannel=(t_func)GetProcAddress(hDLL,"ClearAnalogChannel");
    
    if(!ClearAnalogChannel)
    
    {// handle the error
    
    FreeLibrary(hDLL);
    
    return-2;
    
    }
    
    ClearAllAnalog=(t_func0)GetProcAddress(hDLL,"ClearAllAnalog");
    
    if(!ClearAllAnalog)
    
    {// handle the error
    
    FreeLibrary(hDLL);
    
    return-2;
    
    }
    
    SetAnalogChannel=(t_func)GetProcAddress(hDLL,"SetAnalogChannel");
    
    if(!SetAnalogChannel)
    
    {// handle the error
    
    FreeLibrary(hDLL);
    
    return-2;
    
    }
    
    SetAllAnalog=(t_func0)GetProcAddress(hDLL,"SetAllAnalog");
    
    if(!SetAllAnalog)
    
    {// handle the error
    
    FreeLibrary(hDLL);
    
    return-2;
    
    }
    
    WriteAllDigital=(t_func)GetProcAddress(hDLL,"WriteAllDigital");
    
    if(!WriteAllDigital)
    
    {// handle the error
    
    FreeLibrary(hDLL);
    
    return-2;
    
    }
    
    ClearDigitalChannel=(t_func)GetProcAddress(hDLL,"ClearDigitalChannel");
    
    if(!ClearDigitalChannel)
    
    {// handle the error
    
    FreeLibrary(hDLL);
    
    return-2;
    
    }
    
    ClearAllDigital=(t_func0)GetProcAddress(hDLL,"ClearAllDigital");
    
    if(!ClearAllDigital)
    
    {// handle the error
    
    FreeLibrary(hDLL);
    
    return-2;
    
    }
    
    SetDigitalChannel=(t_func)GetProcAddress(hDLL,"SetDigitalChannel");
    
    if(!SetDigitalChannel)
    
    {// handle the error
    
    FreeLibrary(hDLL);
    
    return-2;
    
    }
    
    SetAllDigital=(t_func0)GetProcAddress(hDLL,"SetAllDigital");
    
    if(!SetAllDigital)
    
    {// handle the error
    
    FreeLibrary(hDLL);
    
    return-2;
    
    }
    
    ReadDigitalChannel=(t_func5)GetProcAddress(hDLL,"ReadDigitalChannel");
    
    if(!ReadDigitalChannel)
    
    {// handle the error
    
    FreeLibrary(hDLL);
    
    return-2;
    
    }
    
    ReadAllDigital=(t_func1)GetProcAddress(hDLL,"ReadAllDigital");
    
    if(!ReadAllDigital)
    
    {// handle the error
    
    FreeLibrary(hDLL);
    
    return-2;
    
    }
    
    Version_=(t_func0)GetProcAddress(hDLL,"Version");
    
    if(!Version_)
    
    {// handle the error
    
    FreeLibrary(hDLL);
    
    return-2;
    
    }
    
    return0;// ok
    
    }
    
    return-1;// error load DLL
    
    }
    in second.cpp

    Code:
    #include"cardselect.h"
    
    #include"ui_cardselect.h"
    
    #include"k8055.h"
    
    #include<QtCore>
    
    #include<QtGui>
    
    intcard;
    
    CardSelect::CardSelect(QWidget*parent):
    
    QDialog(parent),
    
    ui(newUi::CardSelect)
    
    
    
    
    
    
    
    {
    
    ui->setupUi(this);
    
    
    
    
    }
    
    
    
    
    CardSelect::~CardSelect()
    
    {
    
    deleteui;
    
    }
    
    
    
    
    
    
    
    
    
    
    voidCardSelect::on_comboBox_highlighted(intindex)
    
    {
    
    card=index;
    
    }
    
    
    
    
    voidCardSelect::on_pushButton_clicked()
    
    {
    
    if(OpenDevice(card)==-1)
    
    QMessageBox::critical(0,"Failure","Card not attached or not set for address "+QString::number(card));
    
    }


    tons of errors,

    alot of

    error: C2365: 'OpenDevice' : redefinition; previous definition was 'function'

    for each function

    and all left operand because of functions.

    either i missed something, or i have too much something! lol

  12. #12
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    ok tried making a header, and even included a header from the company.

    still having probs.

    my relaypanel (dialog, source and header) loads the dll, and functions of the dll, then calls cardselect (dialog, source and header)

    how do i use a function, in this case opendevice, in the cardselect dialog.

    tried declaring functions in header, and calling them from relaypanel, then including same header in cardselect, it doent know what the functions are OR screaming already declaired

    "If your intent is to directly call functions in the DLL, then second.cpp needs to use the same technique as main.cpp does."

    tried that and it screams duplicate also....

    this all works as a single CPP, with a single UI, and also works as a single CPP in Console.

    as soon as i add a dialog to do the card address selection, the functions dont carry over.

  13. #13
    Algorithm Dissector iMalc's Avatar
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    When writing in C++, take advantage of that. Every single one of those FreeLibrary calls can be eliminated by using RAII. Just create a little smart class and put FreeLibrary in the destructor.
    My homepage
    Advice: Take only as directed - If symptoms persist, please see your debugger

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  14. #14
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    ok, i will start over with everything....

    Created a new GUI Application with QT
    selected DIALOG

    default files made are

    dialog.h

    Code:
    #ifndef DIALOG_H
    #define DIALOG_H
    #include <QDialog>
    namespace Ui {
    class Dialog;
    }
    class Dialog : public QDialog
    {
        Q_OBJECT
        
    public:
        explicit Dialog(QWidget *parent = 0);
        ~Dialog();
        
    private:
        Ui::Dialog *ui;
    };
    #endif // DIALOG_H
    dialog.cpp

    Code:
    #include "dialog.h"
    #include "ui_dialog.h"
    Dialog::Dialog(QWidget *parent) :
        QDialog(parent),
        ui(new Ui::Dialog)
    {
        ui->setupUi(this);
    }
    Dialog::~Dialog()
    {
        delete ui;
    }
    main.cpp

    Code:
    #include "dialog.h"
    #include <QApplication>
    int main(int argc, char *argv[])
    {
        QApplication a(argc, argv);
        Dialog w;
        w.show();
        
        return a.exec();
    }


    now in my main.cpp, i add my dll loading files, and add dll to folder and use command to open the card at address 0

    end up with main.cpp like this

    Code:
    #include "dialog.h"
    #include <QApplication>
    #include <QtCore>
    #include <QtGui>
    #include <windows.h>
    
    typedef void(CALLBACK* t_func)(int );
    typedef void(CALLBACK* t_func0)();
    typedef int(CALLBACK* t_func1)();
    typedef void(CALLBACK* t_func2)(int *, int *);
    typedef void(CALLBACK* t_func3)(int , int );
    typedef int(CALLBACK* t_func4)(int );
    typedef bool(CALLBACK* t_func5)(int );
    t_func4 OpenDevice;
    t_func0 CloseDevice;
    t_func0 Version_;
    t_func4 ReadAnalogChannel;
    t_func2 ReadAllAnalog;
    t_func3 OutputAnalogChannel;
    t_func3 OutputAllAnalog;
    t_func ClearAnalogChannel;
    t_func0 ClearAllAnalog;
    t_func SetAnalogChannel;
    t_func0 SetAllAnalog;
    t_func WriteAllDigital;
    t_func ClearDigitalChannel;
    t_func0 ClearAllDigital;
    t_func SetDigitalChannel;
    t_func0 SetAllDigital;
    t_func5 ReadDigitalChannel;
    t_func1 ReadAllDigital;
    int init(void);
    HINSTANCE hDLL;
    int h = init();
    int main(int argc, char *argv[])
    {
        QApplication a(argc, argv);
        Dialog w;
        int foundDLL = 0;
    
        //Check if DLL was found and loaded//
        if (!h)
            {
                foundDLL = 1;
            }
        else
            {
                QMessageBox select;
                select.windowTitle()="Error";
                select.critical(0, "Critical", "K8055D.DLL NOT FOUND\nExiting program");
                ExitProcess(1);
            }
        //open card at address 0 //
        int Card = 0;
        if (foundDLL)
            {
                if(OpenDevice(Card) == -1)
                    {
                        QMessageBox::critical(0,"Failure!!!","Card not attached or not set for address "+QString::number(Card));
                        ExitProcess(9); // no card
                    }
                if(OpenDevice(Card) != -1)
                    QMessageBox::information(0,"Success!!!","Card attached on address "+QString::number(Card));
            }
        w.show();
        return a.exec();
        CloseDevice();
        FreeLibrary(hDLL);
    }
        int init(void)
        {
            hDLL = LoadLibrary((LPCWSTR)L"k8055d");
            if (hDLL != NULL)
            {
                OpenDevice = (t_func4) GetProcAddress(hDLL, "OpenDevice");
                if (!OpenDevice)
                {      // handle the error
                    FreeLibrary(hDLL);
                    return -2;
                }
                CloseDevice = (t_func0) GetProcAddress(hDLL, "CloseDevice");
                if (!CloseDevice)
                {      // handle the error
                    FreeLibrary(hDLL);
                    return -2;
                }
                ReadAnalogChannel = (t_func4) GetProcAddress(hDLL, "ReadAnalogChannel");
                if (!ReadAnalogChannel)
                {      // handle the error
                    FreeLibrary(hDLL);
                    return -2;
                }
                ReadAllAnalog = (t_func2) GetProcAddress(hDLL, "ReadAllAnalog");
                if (!ReadAllAnalog)
                {      // handle the error
                    FreeLibrary(hDLL);
                    return -2;
                }
                OutputAnalogChannel = (t_func3) GetProcAddress(hDLL, "OutputAnalogChannel");
                if (!OutputAnalogChannel)
                {      // handle the error
                    FreeLibrary(hDLL);
                    return -2;
                }
                OutputAllAnalog = (t_func3) GetProcAddress(hDLL, "OutputAllAnalog");
                if (!OutputAllAnalog)
                {      // handle the error
                    FreeLibrary(hDLL);
                    return -2;
                }
                ClearAnalogChannel = (t_func) GetProcAddress(hDLL, "ClearAnalogChannel");
                if (!ClearAnalogChannel)
                {      // handle the error
                    FreeLibrary(hDLL);
                    return -2;
                }
                ClearAllAnalog = (t_func0) GetProcAddress(hDLL, "ClearAllAnalog");
                if (!ClearAllAnalog)
                {      // handle the error
                    FreeLibrary(hDLL);
                    return -2;
                }
                SetAnalogChannel = (t_func) GetProcAddress(hDLL, "SetAnalogChannel");
                if (!SetAnalogChannel)
                {      // handle the error
                    FreeLibrary(hDLL);
                    return -2;
                }
                SetAllAnalog = (t_func0) GetProcAddress(hDLL, "SetAllAnalog");
                if (!SetAllAnalog)
                {      // handle the error
                    FreeLibrary(hDLL);
                    return -2;
                }
                WriteAllDigital = (t_func) GetProcAddress(hDLL, "WriteAllDigital");
                if (!WriteAllDigital)
                {      // handle the error
                    FreeLibrary(hDLL);
                    return -2;
                }
                ClearDigitalChannel = (t_func) GetProcAddress(hDLL, "ClearDigitalChannel");
                if (!ClearDigitalChannel)
                {      // handle the error
                    FreeLibrary(hDLL);
                    return -2;
                }
                ClearAllDigital = (t_func0) GetProcAddress(hDLL, "ClearAllDigital");
                if (!ClearAllDigital)
                {      // handle the error
                    FreeLibrary(hDLL);
                    return -2;
                }
                SetDigitalChannel = (t_func) GetProcAddress(hDLL, "SetDigitalChannel");
                if (!SetDigitalChannel)
                {      // handle the error
                    FreeLibrary(hDLL);
                    return -2;
                }
                SetAllDigital = (t_func0) GetProcAddress(hDLL, "SetAllDigital");
                if (!SetAllDigital)
                {      // handle the error
                    FreeLibrary(hDLL);
                    return -2;
                }
                ReadDigitalChannel = (t_func5) GetProcAddress(hDLL, "ReadDigitalChannel");
                if (!ReadDigitalChannel)
                {      // handle the error
                    FreeLibrary(hDLL);
                    return -2;
                }
                ReadAllDigital = (t_func1) GetProcAddress(hDLL, "ReadAllDigital");
                if (!ReadAllDigital)
                {      // handle the error
                    FreeLibrary(hDLL);
                    return -2;
                }
                Version_ = (t_func0) GetProcAddress(hDLL, "Version");
                if (!Version_)
                {      // handle the error
                    FreeLibrary(hDLL);
                    return -2;
                }
                return 0;    // ok
            }
            return -1;     // error load DLL
        }

    Then after run, this laods the dll, gets the functions, connects to the card, then opens the dialog..

    NOW i want to control the card with dialog....

    so in dialog.cpp how would i call the functions main.cpp loaded?

    i just need to use lets say

    Code:
    SetDigitalChannel(1);
    to turn on relay 1, how would i call that function from the dialog.cpp?

    i hope this makes more sense, as it is NOT HACKED together, there is nothing wrong with the dll, nothing wrong with the program, as it runs fine from main.cpp, just need to use the function loaded form the dll at runtime in dialog...

  15. #15
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    Quote Originally Posted by iMalc View Post
    When writing in C++, take advantage of that. Every single one of those FreeLibrary calls can be eliminated by using RAII. Just create a little smart class and put FreeLibrary in the destructor.
    ok lost me!!! RAII? smart class?? destructor???

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