动态库.so调用实例

标签：linux   gcc   实例   库   library   

代码业务比较复杂这里就不细说，主要记录下动态库的编译以及调用过程：

1. 创建动态链接库

gcc -shared -fPIC paraDocxml.c  -o libmyxml.so

关于 -fPIC 参考这边笔记 http://blog.csdn.net/knight1840/article/details/47206855

可以看到，当前目录下多了一个文件libmyxml.so

接着生成可执行文件：

gcc TestFileOP.c   -lmyxml    -L.   -lxml2   -L /usr/include/libxml2/ -otest

编译链接成功后会生成test在当前目录；

注意其中- l 参数后边跟的是需要链接的库名，-L .告诉编译器在查找库文件的目录

如果没有-l 和-L说明会出现错误：

collect2: ld returned 1 exit status

源文件：

paraDocxml.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <libxml/parser.h>
#include "paraDocxml.h"
int paraDocxml(char *str_name,char *str_time,char *str_ver,char *str_md5,char *str_des,char *str_relation,char *str_spcversion)
{

    xmlDocPtr doc;
    xmlNodePtr curNode;
    xmlChar *szKey;
    char *Doctmp="Grade_list.xml";
    doc = xmlReadFile(Doctmp,"utf-8",XML_PARSE_RECOVER);
    if (NULL == doc)
    {
        fprintf(stderr,"Document not parsed successfully.\n");
        return -1;
    }
    curNode = xmlDocGetRootElement(doc);
    if (NULL == curNode)
    {
        fprintf(stderr,"empty document.\n");
        xmlFreeDoc(doc);
        return -1;
    }
    if (xmlStrcmp(curNode->name, BAD_CAST "grade_files"))
    {
        fprintf(stderr,"document of the wrong type, root node != root");
        xmlFreeDoc(doc);
        return -1;
    }
    curNode = curNode->xmlChildrenNode;
    while(curNode != NULL)
    {   printf("%s\n",curNode->name);
        if ((!xmlStrcmp(curNode->name, (const xmlChar *)"grade_file")))
        {
            int ret;
            char *pch;
            szKey = xmlNodeGetContent(curNode);
            sscanf((char *)szKey,"%s\n%s\n%s\n%s\n%s\n%s\n%s\n",str_name,str_time,str_ver,str_md5,str_des,str_relation,str_spcversion);
        }
        curNode = curNode->next;
    }
    return 0;
}

                                                                                                                                                                  

#ifndef _paraDocxml_
#define _paraDocxml_

int paraDocxml(char *str_name,char *str_time,char *str_ver,char *str_md5,char *str_des,char *str_relation,char *str_spcversion);
#endif
~

TestFileOP.h

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "paraDocxml.h"
void getCMDResult(const char *cmd,char *result)
{
     char buf_ps[1024];
     char ps[1024]={0};
     FILE *ptr;
     strcpy(ps,cmd);
     if((ptr=popen(ps, "r"))!=NULL)
     {
          while(fgets(buf_ps, 1024, ptr)!=NULL)
          {
               strcat(result, buf_ps);
               if(strlen(result)>1024)
               {
                    break;
               }
          }
          pclose(ptr);
          ptr = NULL;
     }
     else
     {
        printf("the popen erro ");
     }
}
int getCurVersion(char * curVersion)  //get the version 6.0.6 or 6.0.9
{
    FILE *fp;
    char cmd[] = "ls -l |grep p6_tables";
    char result[1024] = {0};
    if ((fp=fopen("issuespc.net", "r")) == NULL)
    {
        printf("file is not exsit!\n");
        getCMDResult(cmd,result);
        if (strlen(result) > 0 )
           strcpy(curVersion,"6.0.9");
        }
        else
        {
           strcpy(curVersion,"6.0.6");
        }
        fp = fopen("issuespc.net","a+");
        if (NULL == fp)
            return -1;
        printf("%s\n",curVersion);
        fprintf(fp,"%s\n",curVersion);

    }
    else
    {
       if( fgets(curVersion,sizeof(curVersion),fp)!= NULL)
       {
            printf("curVersuonforissue:%s",curVersion);
            printf("get susses!\n");
            printf("result:\n%s",result);
            printf("curVersuon:\n%s",curVersion);
            return 0;
       }


    }
 return 0;

}


int main()
{
    char curVersion[256];
    char str_name[32]={0},str_time[32]={0},str_ver[32]={0};
    char str_des[4000]={0},str_md5[64]={0};
    char str_relation[128]={0};
    char str_spcversion[32]={0};
    getCurVersion(curVersion);
    paraDocxml(str_name,str_time,str_ver,str_md5,str_des,str_relation,str_spcversion);
    if (strstr(curVersion,str_spcversion)==NULL)
    {
        printf("The pekage is not match\n");
    }

    printf("curVersion:%s",curVersion);
    return 0;

}

动态库.so调用实例

标签：linux   gcc   实例   库   library   

原文地址：http://blog.csdn.net/knight1840/article/details/47206761