从串口读取的数据保存在CString中后无法操作CString

Question

void CMTKSNDlg::Onreadsn() 
{
CString buff="AT+ESLP=0\n";
CString buff1="AT+EGMR=0,5\n";
CString readbuff;
readbuff.Empty();
//char rb[400]="";
CString b,e;
int i=0;
for(i=0;i<5;i++)
{
m_com.WriteComm((char*)(LPCTSTR)buff,10);
m_com.ReadComm((char*)(LPCTSTR)readbuff,200);  
if(-1!=readbuff.Find("OK",0))  
{ m_com.WriteComm((char*)(LPCTSTR)buff1,12);
m_com.ReadComm((char*)(LPCTSTR)readbuff,400);  //"AT+EGMR=0,5
//
//+EGMR: "324322322290292292294291288"
//
//OK
//xdbcs.cpp"
//这部分是readbuff读取到的内容，然后我要取引号中间的内容，所以就 int beg=temp.readbuff("\"",0)+1;     //这个查找结果正确
int end=temp.readbuff("\"",beg);     //直接报异常
CString sn=readbuff.Mid(beg,end-beg);//        readbuff.GetAt(0);//也报异常
         readbuff.ReleaseBuffer(); //也报异常，总感觉操作不了读回来CString
         return;
}
}
MessageBox("read Fail");
}

Answer 1

temp.readbuff是什么语法？ 不明白，是不是这个意思？
    int beg=readbuff.Find("\"",0)+1;    
    int end=readbuff.Find("\"",beg);     

Answer 2

    int beg=readbuff.readbuff("\"",0)+1;     //这个查找结果正确
    int end=readbuff.readbuff("\"",beg);     //直接报异常笔误，正常应该是这个用其他的CString是正确的，就是从串口读出来的内容放在CString中就操作不了了
比如       GetAt(0);//也报异常
           ReleaseBuffer(); //也报异常，//这样OK
    CString readbuff="213123 3243434 gerg \"0000000\" ertgeergregh "
    int beg=readbuff.readbuff("\"",0)+1;     //这个查找结果正确
    int end=readbuff.readbuff("\"",beg);     //直接报异常
    CString sn=readbuff.Mid(beg,end-beg);//sn="0000000"
    

Answer 3

试试这样void CMTKSNDlg::Onreadsn() 
{
    CString buff="AT+ESLP=0\n";
    CString buff1="AT+EGMR=0,5\n";
    CString readbuff;
    readbuff.Empty();
    //char rb[400]="";
    CString b,e;
    int i=0;
    for(i=0;i<5;i++)
    {
        m_com.WriteComm((char*)(LPCTSTR)buff,10);
        m_com.ReadComm((char*)(LPCTSTR)readbuff.GetBuffer(),200);
        readbuff.ReleaseBuffer();
        if(-1!=readbuff.Find("OK",0))  
        {            m_com.WriteComm((char*)(LPCTSTR)buff1,12);
            m_com.ReadComm((char*)(LPCTSTR)readbuff.GetBuffer(),400); 
            readbuff.ReleaseBuffer(); //"AT+EGMR=0,5
//
//+EGMR: "324322322290292292294291288"
//
//OK
//xdbcs.cpp"
//这部分是readbuff读取到的内容，然后我要取引号中间的内容，所以就    int beg=temp.readbuff("\"",0)+1;     //这个查找结果正确
    int end=temp.readbuff("\"",beg);     //直接报异常
    CString sn=readbuff.Mid(beg,end-beg);//        readbuff.GetAt(0);//也报异常                         return;
        }
    }
    MessageBox("read Fail");    
}