Help a Beginner!

Hey, im making a DLL and i need some help. I need it to return the text in yellow. So what do I add to the following to do so. Here's what i have.

Code:

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#include "dll.h"
#include <windows.h>
#include <iostream.h>

int main()
{

HANDLE hOut;

hOut = GetStdHandle(STD_OUTPUT_HANDLE);

SetConsoleTextAttribute(hOut,
                            FOREGROUND_RED |
                            FOREGROUND_GREEN); }
                           
export double text(double string1, double string2)
 
{
      return (double) string1;
}

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Also is it possible and if so, what steps do you take in searching a string for certain characters and words.

- Thanx

Quote:

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what steps do you take in searching a string for certain characters and words.

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strstr searches for a string inside a string; strchr searches for a character; and strtok seperates a string into strings. There are lots of other functions, too: check some documentation.

So what happened with your DLL code? Did it work? Probably not, or you wouldn't post it here. :)

There isn't something like HTML where your output is written to the console as <color=yellow>yourstringhere</color>. SetConsoleTextAttribute changes attributes of the console window itself, so that any output written to the console has that specific attribute (i.e. color). Here's a function I made you could try and elaborate on:

Code:

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#include <windows.h>
typedef enum colors
{
        red = FOREGROUND_RED,
        blue = FOREGROUND_BLUE,
        green = FOREGROUND_GREEN
};
void WriteColoredString(const char* s, short int color)
{
        DWORD dwNumChars;
        HANDLE hStdout = ::GetStdHandle(STD_OUTPUT_HANDLE);
        ::SetConsoleTextAttribute(hStdout, color);


        /*
        * std::cout << s;
        * printf("%s", s);
        */

        // Write string and change it back to white
        ::WriteConsole(hStdout, s, strlen(s), &dwNumChars, 0);
        ::SetConsoleTextAttribute(hStdout, FOREGROUND_BLUE | FOREGROUND_GREEN | FOREGROUND_RED);
}
int main(int argc, char *argv[])
{
        WriteColoredString("hello\n", red);
        WriteColoredString("hello\n", blue);
        WriteColoredString("hello\n", green);
        return 0;
}

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Okay, so in the DLL i need it to return text, so with

Code:

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export double text(double string1, double string2)

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How do i set that to be the colour?

Code:

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#include "dll.h"
#include <windows.h>
#include <iostream.h>

typedef enum colors
{
        red = FOREGROUND_RED,
        blue = FOREGROUND_BLUE,
        green = FOREGROUND_GREEN
};

void WriteColoredString(const char* s, short int color)
{
        DWORD dwNumChars;
        HANDLE hStdout = ::GetStdHandle(STD_OUTPUT_HANDLE);
        ::SetConsoleTextAttribute(hStdout, color);
       
        ::WriteConsole(hStdout, s, strlen(s), &dwNumChars, 0);
        ::SetConsoleTextAttribute(hStdout, FOREGROUND_BLUE | FOREGROUND_GREEN | FOREGROUND_RED);
}
                           
export double text(double string1, double string2)
 
{
      return (double) string1;
}

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Quote:

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Originally Posted by Mad Dawg

Code:

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export double text(double string1, double string2)
 
{
      return (double) string1;
}

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why are you passing a string as a floating point number?
change it to

Code:

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std::string text(std::string& string1, std::string& string2)
 
{
      // do something useful here
      return string1;
}

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to start with

Ya, but now it doesn't work you see because in the header file is:

Code:

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#define export extern "C" __declspec (dllexport)

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thats why i had:

Code:

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export double text(double string1, double string2)
 
{
      return (double) string1;
}

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Yes the whole double thing makes no sense. Well, I'm pretty proud with my latest experimentations with all this win32 console programming. The name decoration stumped me for a little while, but I finally got this ugly P.O.S. ;)

The .DLL module

Code:

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#define _WIN32_WINNT 0x0600
#include <windows.h>


__declspec(dllexport) char* __cdecl WriteColoredString(const char* s, short int color)
{
        DWORD dwNumChars;
        HANDLE hStdout = ::GetStdHandle(STD_OUTPUT_HANDLE);
        ::SetConsoleTextAttribute(hStdout, color);


        /*
        * std::cout << s;
        * printf("%s", s);
        */

        // Write string and change it back to white
        ::WriteConsole(hStdout, s, strlen(s), &dwNumChars, 0);
        ::SetConsoleTextAttribute(hStdout, FOREGROUND_BLUE | FOREGROUND_GREEN | FOREGROUND_RED);
        return const_cast<char*>(s);
}

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And the executable that loads it:

Code:

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#include <windows.h>
#include <iostream>
typedef enum colors
{
        red = FOREGROUND_RED,
        blue = FOREGROUND_BLUE,
        green = FOREGROUND_GREEN
};
typedef char* (*LPFUNC) (const char*, short int);
int main(int argc, char *argv[])
{
        HINSTANCE hLib;
        hLib = ::LoadLibrary("C:\\Development\\Dev\\test\\test1\\Debug\\Project1.dll");
        if(hLib != NULL)
        {
                char* (*ourFunc)(const char*, short int) =
                        reinterpret_cast<char* (*) (const char*, short int)>
                        (::GetProcAddress(hLib, "_Z18WriteColoredStringPKcs"));
                if(ourFunc != NULL)
                        (*ourFunc) ("hello", red);
                else std::cout << "Error loading function from DLL\n";
        }
        else
                std::cout << "Error loading DLL\n";
        return 0;
}

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