[RESOLVED] ComStat.cbInQue

[AKE]

Is it possible, that ComStat.cbInQue contains value greater than 4096?

[VictorN]

Why not?

[AKE]

VictorN, I transmit file through Com with size ~4399 b, but "archive goal" only 4096)

[VictorN]

How could you write more bytes that internal buffer allows? You should have got ERROR_IO_PENDING!

[AKE]

VictorN,
Internal buffer - 4096b?
I write bytes on DOS device...

[VictorN]

VictorN,
Internal buffer - 4096b?
I write bytes on DOS device...

I don't know the buffer capacity. But I don't care! My WriteFile calls care about it returning TRUE (if writing succeed) or FALSE, and GetLastError returns the reason of failure!

[AKE]

VictorN, Do you know how change buffer size?

[VictorN]

VictorN, Do you know how change buffer size?

Why???
Why not just fix your code instead?

Besides, I doubt it could be possible at all!

[AKE]

void Reader(void *args)
{
  DWORD Err; COMSTAT ComStat;
  DWORD tmpBytesRead;
  while (true)
  {
  DWORD dwRead = 0;
  while (!dwRead)
  {
   if (Writing) break;     
   ClearCommError(hComPort, &Err, &ComStat);
   dwRead = ComStat.cbInQue;
   Sleep(10);
  }
  if (Writing) continue;
  DWORD dwRead2=0;
  while (dwRead != dwRead2)
  {
   dwRead2 = dwRead;
   Sleep(100);  
   ClearCommError(hComPort, &Err, &ComStat);
   dwRead = ComStat.cbInQue;  
  }
   BYTE *arr = new BYTE[1024*1024];
   if (ReadFile(hComPort, arr, min(dwRead, 1024*1024), &tmpBytesRead, NULL))
   {
     BYTE CRC = arr[dwRead-2];
     if ((CRC != GetCRC(arr, dwRead-2))||(arr[dwRead-1] != END_OF_PACKET))
	MessageBox(NULL,L"CRC error or end file.", L"ComFile", 0);
	 else
       {
         OPENFILENAME ofn;       // common dialog box structure
         wchar_t szFile[260];    // buffer for file name
         ZeroMemory(&ofn, sizeof(ofn));
         ofn.lStructSize = sizeof(ofn);
         ofn.hwndOwner = hwnd;
         ofn.lpstrFile = (LPWSTR) szFile;
         ofn.lpstrFile[0] = '\0';
         ofn.nMaxFile = sizeof(szFile);
         ofn.lpstrFilter = L"All\0*.*";
         ofn.nFilterIndex = 1;
         ofn.lpstrFileTitle = NULL;
         ofn.nMaxFileTitle = 0;
         ofn.lpstrInitialDir = NULL;
         ofn.Flags = OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST;
	 HANDLE hf;
	 DWORD Written;
	 if (GetSaveFileName(&ofn)==TRUE)
	 {
           hf = CreateFile(ofn.lpstrFile, 
                    GENERIC_WRITE,
                    0,
                    (LPSECURITY_ATTRIBUTES) NULL,
                    CREATE_ALWAYS,
                    FILE_ATTRIBUTE_NORMAL,
                    (HANDLE) NULL);
		  if (!WriteFile(hf, arr, dwRead-2, &Written, NULL))
	              MessageBox(hwnd,L"Error writing file", L"ComFile", 0); 
			else  MessageBox(hwnd,L"Success", L"ComFile", 0);
	     CloseHandle(hf);
	   }
	 }
   } else MessageBox(NULL,L"Error reading com-port.", L"ComFile", 0);
   PurgeComm(hComPort, PURGE_RXCLEAR);
  }
}

[VictorN]

And what is this code snippet supposed to do?
And what did you expect from the Forum posting this very bad formatted code snippet with a lot of undeclared variables?

[AKE]

And what is this code snippet supposed to do?
Read com port, while data hadn't received. Than reading it and save to file (file name through save file name)...
hComPort - handle of open com port
Writting - if writting, that reading absent.
END_OF_PACKET - Symbol of packet end

[VictorN]

And does this bad written, very bad formatted, not compilable and buggy code have to do with your OP:

Is it possible, that ComStat.cbInQue contains value greater than 4096?

[AKE]

And does this bad written, very bad formatted, not compilable and buggy code have to do with your OP:

Thanks
I had found "SetupComm". Problem had resolved.