RE: [Dev-C++] LoadLib

[Abhinav_Arora <Abh...@sa...>]

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-----Original Message-----
From: Christian Wallukat [mailto:Chr...@vo...]
Sent: Monday, June 17, 2002 3:18 PM
To: CPP-Maillinglist (E-Mail)
Subject: [Dev-C++] LoadLib


Hi List,


I try to learn the handling with DLLs and the Project I've wrote doesnt
work...

Has anyone some Ideas what I've made wrong ???



Kind Regards


CHW

Here the code:

#include <windows.h>
#include <TCHAR.h>
#include <stdio.h>



static HINSTANCE hLibrary ;



int main(int argc, char* argv[])
{

	bool bT;		

	LPCSTR test;
	
	
	typedef bool (*lpTest)(void);
	typedef LPCSTR (*lpTest2)(void);
	typedef char* (*lpTest3) (char*);


	lpTest fnTest;
	lpTest2 fnTest2;
	lpTest3 fnTest3;


	//DLL einbinden
	if ((hLibrary = LoadLibrary (TEXT("DLL.DLL"))) == NULL)
    	{
		MessageBox (NULL, TEXT ("Can't load DLL.DLL."), "hjjhkj", 0)
;
        		return -1 ;
   	 };
	
	
   	 fnTest = (lpTest) GetProcAddress(hLibrary, _T("_Test1@0"));
    	if (fnTest != NULL)
	{
		printf("juhu\n");
		bT = fnTest();
	};
	
	FreeLibrary(hLibrary);         // Unload DLL from memory



	if ((hLibrary = LoadLibrary (TEXT("DLL.DLL"))) == NULL)
    	{
		MessageBox (NULL, TEXT ("Can't load DLL.DLL."), "hjjhkj", 0)
;
        	return -1 ;
    	};
	
    	fnTest2 = (lpTest2) GetProcAddress(hLibrary, _T("Test2"));
    	if (fnTest != NULL)
	{
		printf("juhu2\n");
		test = fnTest2();
		
	};
	
	FreeLibrary(hLibrary);         // Unload DLL from memory





	if ((hLibrary = LoadLibrary (TEXT("DLL.DLL"))) == NULL)
    	{
		MessageBox (NULL, TEXT ("Can't load DLL.DLL."), "hjjhkj", 0)
;
        		return -1 ;
    	};
	
    	fnTest3 = (lpTest3) GetProcAddress(hLibrary, _T("_Test3@4"));
    	if (fnTest3 != NULL)
	{
		char szTest[400];
		*szTest = 0;
		printf("juhu3");
		strcpy (szTest, fnTest3("hallo welt\0"));
		printf("%s", szTest);

		
	};
	
	FreeLibrary(hLibrary);         // Unload DLL from memory


	getchar();

	return 0;
}



Here the DLL:

#include <windows.h>
#include <string.h>

#ifdef __cplusplus
#define EXPORT extern "C" __declspec (dllexport)
#else
#define EXPORT __declspec (dllexport)
#endif

EXPORT BOOL CALLBACK TestA();

#define TestA Test1

EXPORT LPCSTR CALLBACK TestB();

#define TestB Test2

EXPORT char* CALLBACK TestC(char*);

#define TestC Test3


BOOL APIENTRY DllMain( HANDLE hModule, 
                       DWORD  ul_reason_for_call, 
                       LPVOID lpReserved
					 )
{
    return TRUE;
}

EXPORT BOOL CALLBACK TestA(void)
{
	return TRUE;
};

EXPORT LPCSTR TestB(void)
{
	return "Test\0";
};

EXPORT char* CALLBACK TestC(char *lpcStr)
{
	MessageBox(NULL, lpcStr, "test", MB_OK);


	return lpcStr;
};

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