Help a Beginner!

This is a discussion on Help a Beginner! within the C++ Programming forums, part of the General Programming Boards category; Hey, im making a DLL and i need some help. I need it to return the text in yellow. So ...

  1. #1
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    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:
    #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;
    }
    Also is it possible and if so, what steps do you take in searching a string for certain characters and words.

    - Thanx

  2. #2
    Frequently Quite Prolix dwks's Avatar
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    what steps do you take in searching a string for certain characters and words.
    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.
    dwk

    Seek and ye shall find. quaere et invenies.

    "Simplicity does not precede complexity, but follows it." -- Alan Perlis
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  3. #3
    Registered User Tonto's Avatar
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    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:
    #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;
    }

  4. #4
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    Okay, so in the DLL i need it to return text, so with

    Code:
    export double text(double string1, double string2)
    How do i set that to be the colour?

    Code:
    #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;
    }

  5. #5
    semi-colon generator ChaosEngine's Avatar
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    Quote Originally Posted by Mad Dawg
    Code:
                
    export double text(double string1, double string2)
      
    {
           return (double) string1;
    }
    why are you passing a string as a floating point number?
    change it to
    Code:
                
    std::string text(std::string& string1, std::string& string2)
      
    {
          // do something useful here
           return string1;
    }
    to start with

  6. #6
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    Ya, but now it doesn't work you see because in the header file is:

    Code:
    #define export extern "C" __declspec (dllexport)
    thats why i had:

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

  7. #7
    Registered User Tonto's Avatar
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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:
    #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);
    }
    And the executable that loads it:
    Code:
    #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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