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