串口ReadPortThread读到数据后，怎样正确显示出来？

wolfsoldier 2007-6-8 11:46 楼主

DWORD WINAPI ReadPortThread(LPVOID lpvoid)
{
BYTE Byte;
DWORD dwCommModemStatus,
      dwBytesTransferred;
CString tempStr;

// Specify a set of events to be monitored for the port.
SetCommMask (hPort, EV_RXCHAR);

WaitCommEvent (hPort, &dwCommModemStatus, 0);
if (dwCommModemStatus & EV_RXCHAR)
{
DWORD length=0;
COMSTAT ComStat;
DWORD dwErrorFlags;
char *buf=NULL;
ClearCommError(hPort,&dwErrorFlags,&ComStat);
length=ComStat.cbInQue;
ReadFile(hPort,buf,length,&length,NULL);

CString temp=buf;
MessageBox(NULL,temp,TEXT("Result"),MB_OK);
}

// Retrieve modem control-register values.
GetCommModemStatus (hPort, &dwCommModemStatus);
}
则消息框里为空。
在下查到些方案，如
if(dwLength>0)

                  {

                        //从串口读取数据

                        TCHAR* buf=new TCHAR[256];

                        fReadState=ReadFile(hPort,buf,dwLength,&dwLength,NULL);
                        if(!fReadState)
                        {
                                 //不能从串口读取数据
                                 MessageBox(NULL,TEXT("Error in read from serial port"),TEXT("Read Error"),MB_OK);
                        }
                        else
                        {
                              //把数据赋值给全局变量
                                 strInChar=buf;
                        }
                        delete[] buf;
                  }
问题抖出在类型转化、缓冲区之间数据拷贝的问题，不知道怎样解决。各位帮帮忙看看。