c语言如何生成DLL文件.doc

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 stdio.h#include stdlib.h 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 windows.h#include stdio.h#include stdlib.h 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 /*c语言调用dll里的函数-例子2之文件下载 都5点了，还是睡不着，躺在床上 想着该做点撒，于是乎，开始查找了下资料，大致弄清楚了c里怎么调用dll 里的函数，就写了个文件下载的例子，很简单，调用系统本身的UrlMon.dll 里的 URLDownloadToFileA 函数，之前的例子一是过程的调用，现在这个是 函数的调用，都很简单。*/ #include WINDOWS.H #include WINBASE.H typedef int (*MYFUNC)(PVOID,char*,char*,int,char*); /* 函数原型*/ int main() { HINSTANCE LibHandle; MYFUNC FUNCADD; char dllbuf[] = UrlMon.dll; char sysbuf[] = URLDownloadToFileA; /*函数名*/ char *downfile = /img/logo-yy.gif; /*过程要带入的参数*/ char *savefile = f:\\c\\baidu.gif; LibHandle = LoadLibrary(dllbuf); /*载入dll*/