map insert error

whdugh 2015-01-21 07:39:34

在类的私有数据成员定义了一个map<string,string> m_CameraIPMap用来保存相机IP和相机的设备编号，
然后写了一个函数往m_CameraIPMap插入数据，结果结果在linux下运行受到数据写入map时程序就崩溃了，我在
vs2010下自己写了个test程序也没用错啊，这是什么原因啊。

oid CDspServer::SetCameraIPAndDeviceID(const char* szAddress,const char *szCameraID)

{

std::string strAddress("");

strAddress.append(szAddress);

printf("[%s]:%s\n",__FUNCTION__,strAddress.c_str());

std::string strCameraID("");

strCameraID.append(szCameraID);

printf("[%s]:%s\n",__FUNCTION__,strCameraID.c_str());

//printf("ip = %s,id = %s\n",szAddress,szCameraID);

//m_CameraIPMap.insert(make_pair("2","33"));

//m_CameraIPMap.insert(make_pair(szAddress,szCameraID)); //runtime error

m_CameraIPMap.insert(make_pair(strAddress,strCameraID)); //runtime error

printf("ip = %s,id = %s\n",szAddress,szCameraID);

}

然后bt下，

Program received signal SIGSEGV, Segmentation fault.

[Switching to Thread 0x7fff478cc700 (LWP 32325)]

0x00007ffff28e8690 in std::string::compare(std::string const&) const ()

   from /usr/lib/x86_64-linux-gnu/libstdc++.so.6

(gdb) bt

#0  0x00007ffff28e8690 in std::string::compare(std::string const&) const ()

   from /usr/lib/x86_64-linux-gnu/libstdc++.so.6

#1  0x0000000000530b0a in CDspServer::RecvDspDataFd(_DspSocketFd const&, char*, int&) ()

#2  0x0000000000500216 in CDspClient::Working(templateThreadTask<CDspClient>*) ()

#3  0x00000000006e6c46 in templateThreadTask<CDspClient>::Run() ()

#4  0x000000000070fddb in Thread::StartThread(void*) ()

#5  0x00007ffff241ee9a in start_thread (arg=0x7fff478cc700) at pthread_create.c:308

#6  0x00007ffff214b3fd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112

#7  0x0000000000000000 in ?? ()

(gdb)

...全文

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赵4老师 2015-01-22

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有时不将“调用函数名字＋各参数值，进入函数后各参数值，中间变量值，退出函数前准备返回的值，返回函数到调用处后函数名字＋各参数值＋返回值”这些信息写日志到文件中是无论如何也发现不了问题在哪里的，包括捕获各种异常、写日志到屏幕、单步或设断点或生成core文件、……这些方法都不行！写日志到文件参考下面：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef WIN32
    #include <windows.h>
    #include <io.h>
#else
    #include <unistd.h>
    #include <sys/time.h>
    #include <pthread.h>
    #define  CRITICAL_SECTION   pthread_mutex_t
    #define  _vsnprintf         vsnprintf
#endif
//Log{
#define MAXLOGSIZE 20000000
#define MAXLINSIZE 16000
#include <time.h>
#include <sys/timeb.h>
#include <stdarg.h>
char logfilename1[]="MyLog1.log";
char logfilename2[]="MyLog2.log";
static char logstr[MAXLINSIZE+1];
char datestr[16];
char timestr[16];
char mss[4];
CRITICAL_SECTION cs_log;
FILE *flog;
#ifdef WIN32
void Lock(CRITICAL_SECTION *l) {
    EnterCriticalSection(l);
}
void Unlock(CRITICAL_SECTION *l) {
    LeaveCriticalSection(l);
}
#else
void Lock(CRITICAL_SECTION *l) {
    pthread_mutex_lock(l);
}
void Unlock(CRITICAL_SECTION *l) {
    pthread_mutex_unlock(l);
}
#endif
void LogV(const char *pszFmt,va_list argp) {
    struct tm *now;
    struct timeb tb;

    if (NULL==pszFmt||0==pszFmt[0]) return;
    _vsnprintf(logstr,MAXLINSIZE,pszFmt,argp);
    ftime(&tb);
    now=localtime(&tb.time);
    sprintf(datestr,"%04d-%02d-%02d",now->tm_year+1900,now->tm_mon+1,now->tm_mday);
    sprintf(timestr,"%02d:%02d:%02d",now->tm_hour     ,now->tm_min  ,now->tm_sec );
    sprintf(mss,"%03d",tb.millitm);
    printf("%s %s.%s %s",datestr,timestr,mss,logstr);
    flog=fopen(logfilename1,"a");
    if (NULL!=flog) {
        fprintf(flog,"%s %s.%s %s",datestr,timestr,mss,logstr);
        if (ftell(flog)>MAXLOGSIZE) {
            fclose(flog);
            if (rename(logfilename1,logfilename2)) {
                remove(logfilename2);
                rename(logfilename1,logfilename2);
            }
        } else {
            fclose(flog);
        }
    }
}
void Log(const char *pszFmt,...) {
    va_list argp;

    Lock(&cs_log);
    va_start(argp,pszFmt);
    LogV(pszFmt,argp);
    va_end(argp);
    Unlock(&cs_log);
}
//Log}
int main(int argc,char * argv[]) {
    int i;
#ifdef WIN32
    InitializeCriticalSection(&cs_log);
#else
    pthread_mutex_init(&cs_log,NULL);
#endif
    for (i=0;i<10000;i++) {
        Log("This is a Log %04d from FILE:%s LINE:%d\n",i, __FILE__, __LINE__);
    }
#ifdef WIN32
    DeleteCriticalSection(&cs_log);
#else
    pthread_mutex_destroy(&cs_log);
#endif
    return 0;
}
//1-78行添加到你带main的.c或.cpp的那个文件的最前面
//81-85行添加到你的main函数开头
//89-93行添加到你的main函数结束前
//在要写LOG的地方仿照第87行的写法写LOG到文件MyLog1.log中

whdugh 2015-01-22