c - 如何在c中调用动态库？

作业系统：ubuntu 14.04

编写两个名为dtest1.c和dtest2.c的.c文件

dtest1.c

int p = 2;
void print()
{
    printf("this is the first dll test!\n");

    }

dtest2.c

int p = 3;
void print()
{
    printf("this is the second dll test!\n");

    }

然后，编译它们以获取两个名为dtest1.so和dtest2.so的文件。

  $gcc -O -fpic -shared -o dtest1.so dtest1.c
  $gcc -O -fpic -shared -o dtest2.so dtest2.c

编写一个名为dtest3.c的.c文件

dtest3.c

#include "dtest1.so"
int main ()
{
    print();
    return 0;
    }

到目前为止，一切都很好。没有错误（仅警告）

然后：

gcc -o dtest3 dtest3.c dtest1.so

错误：

In file included from dtest3.c:1:0:
dtest1.so:17:1: warning: null character(s) ignored [enabled by default]
dtest1.so:17:2: error: stray ‘\260’ in program
   ......
   ......    /*omit too many similar information */
dtest1.so:18:2: error: stray ‘\212’ in program
dtest1.so:18:2: error: stray ‘\1’ in program
In file included from dtest3.c:1:0:
dtest1.so:18:956: warning: null character(s) ignored [enabled by default]
In file included from dtest3.c:1:0:
dtest1.so:18:2: error: stray ‘\244’ in program
dtest1.so:18:2: error: stray ‘\1’ in program
In file included from dtest3.c:1:0:
dtest1.so:18:980: warning: null character(s) ignored [enabled by default]
dtest1.so:18:982: warning: null character(s) preserved in literal [enabled by default]
dtest1.so:18:982: warning: missing terminating " character [enabled by default]
In file included from dtest3.c:1:0:
dtest1.so:18:2: error: missing terminating " character

怎么了

请帮助我找出错误，谢谢。

最佳答案

库是编译后的代码，而不是（文本）源代码。 #include只是插入给定文件的内容，因此它应该是源代码。您必须通过将库作为参数传递给链接器来链接您的库。

阅读here了解更多。