win32 c语言编程 win32环境C语言实现最基本的DLL编写及调用实例 测试通过[原]

开发环境是DEV C++,采用C语言编写

创建一个DLL项目，项目名称hello,DLL编写采用的是DEV C++中的示例代码

头文件dll.h

#ifndef _DLL_H_

#define _DLL_H_

#if BUILDING_DLL

# define DLLIMPORT __declspec (dllexport)

#else /* Not BUILDING_DLL */

# define DLLIMPORT __declspec (dllimport)

#endif /* Not BUILDING_DLL */

DLLIMPORT void HelloWorld (void);

#endif /* _DLL_H_ */

C文件

dllmain.c

#include

#include

DLLIMPORT void HelloWorld ()

{

MessageBox (0, "Hello World from DLL!\n", "Hi", MB_ICONINFORMATION);

}

BOOL APIENTRY DllMain (HINSTANCE hInst /* Library instance handle. */ ,

DWORD reason /* Reason this function is being called. */ ,

LPVOID reserved /* Not used. */ )

{

switch (reason)

{

case DLL_PROCESS_ATTACH:

break;

case DLL_PROCESS_DETACH:

break;

case DLL_THREAD_ATTACH:

break;

case DLL_THREAD_DETACH:

break;

}

/* Returns TRUE on success, FALSE on failure */

return TRUE;

}

还有要注意的在.def文件中指定输出的函数，编译生成了hello.dll文件

DLL调用部分

dllcall.c

#include

#include

#include

HINSTANCE hDLL; //定义DLL包柄

typedef void ( *func)(); //定义函数指针原型

func hello; //定义函数指针

int main()

{

if (hDLL == NULL)

hDLL=LoadLibrary("hello.dll");//加载DLL

hello = (func)GetProcAddress(hDLL,"HelloWorld"); //获取函数指针

hello();

FreeLibrary(hDLL); //释放DLL

return 0;

}

编译执行