C语言下动态库相互调用

前段时间需要完成多个模块业务，而这些模块的接口都是一样的，于是为了方便管理就把每个模块都根据接口封装成了SO库，这里就留下SO库调用样例

SO库源文件代码：

//TestSo.c
#include <stdio.h>

int CommonInterface(char* str, unsigned int strLen)
{
    //deal with ...
    printf("%s, %d
", str, strLen);
    return 1;
}

编译命令：

gcc -shared -o TestSo.so TestSo.c

 

使用库代码：

//Main.c
#include <stdio.h>
#include <dlfcn.h>

typedef int (*CommonInterface_Func)(char* str, unsigned int strLen);

#define TEST_SO_FILE "/root/test/libtestSo.so"
void* soHandle = NULL;

/* get dynamic library function address, returns 1 success, otherwise fail. */
int getCommonInterfaceFuncAddr(CommonInterface_Func* funcAddr)
{
    // laod dynamic library.
    soHandle = dlopen(TEST_SO_FILE, RTLD_LAZY);
    if ( soHandle == NULL )
    {
        printf("dlopen,(%s)", dlerror());
        return 0;
    }    
    // get func addr
    *funcAddr = (CommonInterface_Func)dlsym(soHandle, "CommonInterface");
    if ( *funcAddr == NULL )
    {
        printf("dlsym,(%s)", dlerror());
        dlclose(m_soHandle);
        return 0;
    }
    return 1;
}

int main(int argc, char* argv[])
{
    char* str = "hello so.";
    CommonInterface_Func funcAddr = NULL;
    int result = getCommonInterfaceFuncAddr(&funcAddr);

    if (result != 1)
    {
        printf("get func address fail.
");
        return 0;
    }
    printf("get func address success.
");
    result = funcAddr(str, strlen(str));
    printf("exec func result : %d
", result);
    
    return 1;
}

编译命令：

 gcc -o Main_exec Main.c -ldl

 执行：./Main_exec

参考链接：http://www.cnblogs.com/leaven/archive/2010/06/11/1756294.html