方法一：

共有三个文件：print.h，print.c，test.c

---

print.h： 文件内容

ifndef PRINT_H

define PRINT_H

ifdef __cplusplus

extern " C " {

endif

//打印点东西 void Print(int iNum);

ifdef __cplusplus

}

endif

endif

---

---

print.c： 文件内容

include

include "print.h"

void Print(int iNum) { switch(iNum) { case 1: printf("hello,this is 1/n"); break; case 2: printf("ok ,2 now/n"); break; default: printf("hihi,default now /n"); break; } getch(); return; }

---

---

test.c：文件内容

include

include "print.h"

int main() { printf("please print a num:/n"); int iNum = -1; scanf("%d", &iNum); Print(iNum); return 1; }

---

编译动态dll库：

gcc -Wall -shared print.c -o print.dll

或者

gcc --share print.c -o print.dll

调用dll库生成exe文件：

gcc test.c print.dll -o test

编译静态库，可供windows调用：

1、gcc -shared -o print.dll print.c -Wl,--output-def,print.def,--out-implib,libprint.a

2、lib /machine:i386 /def:print.def

调用：vs2005

main.c

include

include

include "print.h"

pragma comment(lib,"print.lib")

int main() { Print(1); system("pause");

return 0;

}

方法二：

两个文件：Foo.c 和 Foo_test.c

---

Foo.c：文件内容

include

include

// 这就是按需加载的dll的主函数，dll被加载、卸载时，系统都回调用这个函数，通过dwReason判断 BOOL WINAPI DllMain(HINSTANCE hModule, DWORD dwReason, LPVOID lpvReserved) { switch(dwReason) { // 如果是进程加载本dll case DLL_PROCESS_ATTACH: printf("process attach/n"); break; // 如果是进程卸载本dll case DLL_PROCESS_DETACH: printf("thread attach/n"); break; // 如果是线程加载本dll case DLL_THREAD_ATTACH: printf("thread attach/n"); break; // 如果是线程卸载本dll case DLL_THREAD_DETACH: printf("process attach/n"); break; } // 如果返回FALSE，则说明加载失败，不会继续被加载，也不可使用 return TRUE; }

int foo(char *str) { printf("%s/n", str); return 0; }

---

---

Foo_test.c：文件内容

include

include

typedef int (FOO)(char str);

int main() { HMODULE mod; FOO foo;

    mod = LoadLibrary("lib.dll");

    printf("from main/n");

    if((foo = (FOO)GetProcAddress(mod, "foo")) != NULL) {
            foo("hello world");
    }

    FreeLibrary(mod);

getch();

    return 0;

}

---

编译动态dll库：

gcc -Wall -shared Foo.c -o Foo.dll

或者

gcc --share Foo.c -o Foo.dll

调用dll库生成exe文件：

gcc Foo_test.c Foo.dll -o Foo_test

资料：

1、基于MSYS的Win32动态链接库DLL开发：http://code.google.com/p/msys-cn/wiki/Chapter5