The problem with messages in c #, how to receive messages from multiple message sources to determine?

hyukio35

The function of sending messages is defined in a dll,
bool StartMonitor (HANDLE hComm, HWND hOwner)
{
DWORD dwThreadId;


CommInfo.hComm = hComm;
CommInfo.hOwner = hOwner;

hThread = CreateThread ((LPSECURITY_ATTRIBUTES) NULL, 0, ThreadProc,&CommInfo, 0,&dwThreadId);
if (hThread == NULL)
return false;

return true;
}

DWORD WINAPI ThreadProc (LPVOID lpParameter)
{
COMMINFO * pCommInfo;
DWORD Bytes = 0;
DWORD BytesToRead = 0;
DWORD ErrorFlags = 0;
char CnfMsg [MAX_BUF_SIZE] = "\0";
char szReadBuf [MAX_BUF_SIZE] = "\0";
DWORD dwEvtMask = 0;
DWORD dwSignal = 0;
Ranch
pCommInfo = (COMMINFO *) lpParameter;

// Clear the serial buffer
PurgeComm (pCommInfo-> hComm, PURGE_RXCLEAR | PURGE_TXCLEAR | PURGE_RXABORT | PURGE_TXABORT);
Ranch
// Which serial events need to be monitored
SetCommMask (pCommInfo-> hComm, EV_ERR | EV_RLSD | EV_RING | EV_RXCHAR | EV_TXEMPTY);
    
    while (1) {
WaitCommEvent (pCommInfo-> hComm,&dwEvtMask,&Overlapped);
dwSignal = WaitForMultipleObjects (2, hEvents, FALSE, INFINITE);

if (dwSignal == WAIT_OBJECT_0) {
if ((dwEvtMask&EV_RXCHAR) == EV_RXCHAR) {
Sleep (100);
RecvChar (pCommInfo-> hComm);
if (strlen (RecvBuf)! = 0) {

strupr (RecvBuf);

#ifdef SMS_DLL_DEBUG
sprintf (RecvDebugInfo, "<-% s", RecvBuf);
if (strncmp (RecvBuf, "ATWITS", 6))
PostMessage (pCommInfo-> hOwner, WM_RECVDATA, 1, (LPARAM)&RecvDebugInfo);
else
if (DispFlag)
PostMessage (pCommInfo-> hOwner, WM_RECVDATA, 1, (LPARAM)&RecvDebugInfo);
#endif

if (! strncmp (RecvBuf, "ATWITS + CMTI: 1", 13)) {
if (pCommInfo-> hOwner! = NULL)
PostMessage (pCommInfo-> hOwner, WM_RECVSMS, (LPARAM) pCommInfo-> hComm, 0);
}
// else if (! strncmp (RecvBuf, "ATWITS", 6)) {
// if (pCommInfo-> hOwner! = NULL)
// PostMessage (pCommInfo-> hOwner, WM_POWERON, 0, 0);
//}
else if (strlen (RecvBuf)! = 0) {
// Increase critical section control
memset (RetInfo, 0, MAX_BUF_SIZE);
strcpy (RetInfo, RecvBuf);
SetEvent (hRecvEvent);
}
Ranch
memset (RecvBuf, 0, MAX_BUF_SIZE);
}
}

ResetEvent (Overlapped.hEvent);
}
else if (dwSignal == WAIT_OBJECT_0 + 1) {
SendChar (pCommInfo-> hComm);
}
}

return 0;
}

Calling StartMonitor in the c # program can enable monitoring of the com port, but the program needs to monitor multiple serial devices on a computer, so the winproc function is overloaded in c #. m.WParam, phoneNum, msg); the above message is not received well, I wonder if everyone has a good way

hyukio35

Hope you give some constructive comments

hyukio35

No one to help

苹果小刀

Bangding, I don't understand communication!

kalian2000

come and see..

Learn + like ..

57162356

learning

wudi1982

Can't receive well? How bad is it, please describe in detail

irwin8888

Don't understand

迷途精灵

I don't understand your code too much.My program also needs to monitor multiple serial ports.I wrote a class to send and receive data to the serial port, and then instantiate this class in the main form. Instantiate multiple classes, and use the timer to accept serial data in the class, and then send it to the main form.

hyukio35

In c #, I open each serial port in a loop. After all the devices are opened, the main program can only receive messages from the last serial port. The previous serial ports are not working. So I would like to ask everyone to help.