Why such small program don't send nothing through com-port?
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Thread: Why such small program don't send nothing through com-port?

  1. #1
    Join Date
    Feb 2012
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    181

    Question Why such small program don't send nothing through com-port?

    But I have program, which send data with similar connection paremeters normally. What is problem?
    Code:
    // Temp.cpp : Defines the entry point for the application.
    //
    
    #include "stdafx.h"
    #include "Temp.h"
    
    #define MAX_LOADSTRING 100
    
    // Global Variables:
    HINSTANCE hInst;								// current instance
    TCHAR szTitle[MAX_LOADSTRING];					// The title bar text
    TCHAR szWindowClass[MAX_LOADSTRING];			// the main window class name
    
    // Forward declarations of functions included in this code module:
    ATOM				MyRegisterClass(HINSTANCE hInstance);
    BOOL				InitInstance(HINSTANCE, int);
    LRESULT CALLBACK	WndProc(HWND, UINT, WPARAM, LPARAM);
    INT_PTR CALLBACK	About(HWND, UINT, WPARAM, LPARAM);
    HANDLE hComPort;
    BYTE Eof;
    BYTE STX;
    DWORD InitPort()
    {
    	hComPort = INVALID_HANDLE_VALUE;
    	// открыть порт . . . 
    	hComPort = CreateFile(L"COM3",			// порт
              GENERIC_READ | GENERIC_WRITE,		//чтение и запись
              0,						// must be opened with exclusive-access
              NULL,						// default security // no security attributes
              OPEN_EXISTING,			// existing file only
              FILE_ATTRIBUTE_NORMAL,	//FILE_ATTRIBUTE_NORMAL, FILE_FLAG_OVERLAPPED,	//? normal file   // not overlapped I/O == 0,  
              NULL);					// no attr. template // hTemplate must be NULL for comm devices
    	if (hComPort == INVALID_HANDLE_VALUE) 
    	{
    		DWORD err = GetLastError();
    		CloseHandle(hComPort);
    		return err;
    	}
    	DCB dcb;
    	COMMTIMEOUTS PortTimeOuts;
    	// настройки порта . . .
    	if (!GetCommState(hComPort, &dcb)) 
    	{
    		DWORD err = GetLastError();
    		CloseHandle(hComPort);
    		return err;
    	}
    	dcb.BaudRate = CBR_9600;     // set the baud rate CBR_9600
    	dcb.ByteSize = 8;             // data size, xmit, and rcv
    	dcb.Parity = NOPARITY;        // no parity bit
    	dcb.StopBits = TWOSTOPBITS;    // one stop bit
    	if (!SetCommState(hComPort, &dcb)) 
    	{
    		DWORD err = GetLastError();
    		CloseHandle(hComPort);
    		return err;
    	}
        SetupComm(hComPort, 1024*1024, 1024*1024);
    	// таймауты ввода-вывода . . . 
    	if (!GetCommTimeouts(hComPort, &PortTimeOuts)) 
    	{
    		DWORD err = GetLastError();
    		CloseHandle(hComPort);
    		return err;
    	}
    	PortTimeOuts.ReadIntervalTimeout		 = 5;
    	PortTimeOuts.ReadTotalTimeoutMultiplier  = 5;
    	PortTimeOuts.ReadTotalTimeoutConstant    = 2000;
    	PortTimeOuts.WriteTotalTimeoutMultiplier = 0;
    	PortTimeOuts.WriteTotalTimeoutConstant   = 0;
    	
    	if (!SetCommTimeouts(hComPort, &PortTimeOuts)) 
    	{
    		DWORD err = GetLastError();
    		CloseHandle(hComPort);
    		return err;
    	}
    	PurgeComm( hComPort, PURGE_RXCLEAR );		//Очистить буфер драйвера на приём
    	return 0;
    
    }
    
    void TempWrite()
    {
    
     if (InitPort())
      {
    	//MessageBox(hwnd,L"Ошибка открытия порта", L"Ошибка", 0);         
    	//Writing = FALSE;
        return;    
      }
     Sleep(400);
     DWORD Written;
    		   char b='a';
              BYTE *arr = new BYTE[256];
    		 arr[0] = 3;
    		 arr[1] = '\0';
    		 arr[2] = STX;
    		 arr[3] = '\0';
    		 arr[4] = 4;
    		 arr[5] = Eof;
    		 WriteFile(hComPort, arr, 256, &Written, NULL);
          CloseHandle(hComPort);
     }
    
    int APIENTRY _tWinMain(HINSTANCE hInstance,
                         HINSTANCE hPrevInstance,
                         LPTSTR    lpCmdLine,
                         int       nCmdShow)
    {
    	UNREFERENCED_PARAMETER(hPrevInstance);
    	UNREFERENCED_PARAMETER(lpCmdLine);
    
     	// TODO: Place code here.
    	MSG msg;
    	HACCEL hAccelTable;
    
    	// Initialize global strings
    	LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
    	LoadString(hInstance, IDC_TEMP, szWindowClass, MAX_LOADSTRING);
    	MyRegisterClass(hInstance);
    
    	// Perform application initialization:
    	if (!InitInstance (hInstance, nCmdShow))
    	{
    		return FALSE;
    	}
    
    	hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_TEMP));
        TempWrite();
    	// Main message loop:
    	while (GetMessage(&msg, NULL, 0, 0))
    	{
    		if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
    		{
    			TranslateMessage(&msg);
    			DispatchMessage(&msg);
    		}
    	}
    
    	return (int) msg.wParam;
    }
    
    
    
    //
    //  FUNCTION: MyRegisterClass()
    //
    //  PURPOSE: Registers the window class.
    //
    //  COMMENTS:
    //
    //    This function and its usage are only necessary if you want this code
    //    to be compatible with Win32 systems prior to the 'RegisterClassEx'
    //    function that was added to Windows 95. It is important to call this function
    //    so that the application will get 'well formed' small icons associated
    //    with it.
    //
    ATOM MyRegisterClass(HINSTANCE hInstance)
    {
    	WNDCLASSEX wcex;
    
    	wcex.cbSize = sizeof(WNDCLASSEX);
    
    	wcex.style			= CS_HREDRAW | CS_VREDRAW;
    	wcex.lpfnWndProc	= WndProc;
    	wcex.cbClsExtra		= 0;
    	wcex.cbWndExtra		= 0;
    	wcex.hInstance		= hInstance;
    	wcex.hIcon			= LoadIcon(hInstance, MAKEINTRESOURCE(IDI_TEMP));
    	wcex.hCursor		= LoadCursor(NULL, IDC_ARROW);
    	wcex.hbrBackground	= (HBRUSH)(COLOR_WINDOW+1);
    	wcex.lpszMenuName	= MAKEINTRESOURCE(IDC_TEMP);
    	wcex.lpszClassName	= szWindowClass;
    	wcex.hIconSm		= LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));
    
    	return RegisterClassEx(&wcex);
    }
    
    //
    //   FUNCTION: InitInstance(HINSTANCE, int)
    //
    //   PURPOSE: Saves instance handle and creates main window
    //
    //   COMMENTS:
    //
    //        In this function, we save the instance handle in a global variable and
    //        create and display the main program window.
    //
    BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
    {
       HWND hWnd;
    
       hInst = hInstance; // Store instance handle in our global variable
    
       hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
          CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);
    
       if (!hWnd)
       {
          return FALSE;
       }
    
       ShowWindow(hWnd, nCmdShow);
       UpdateWindow(hWnd);
    
       return TRUE;
    }
    
    //
    //  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
    //
    //  PURPOSE:  Processes messages for the main window.
    //
    //  WM_COMMAND	- process the application menu
    //  WM_PAINT	- Paint the main window
    //  WM_DESTROY	- post a quit message and return
    //
    //
    LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
    {
    	int wmId, wmEvent;
    	PAINTSTRUCT ps;
    	HDC hdc;
    
    	switch (message)
    	{
    	case WM_COMMAND:
    		wmId    = LOWORD(wParam);
    		wmEvent = HIWORD(wParam);
    		// Parse the menu selections:
    		switch (wmId)
    		{
    		case IDM_ABOUT:
    			DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
    			break;
    		case IDM_EXIT:
    			DestroyWindow(hWnd);
    			break;
    		default:
    			return DefWindowProc(hWnd, message, wParam, lParam);
    		}
    		break;
    	case WM_PAINT:
    		hdc = BeginPaint(hWnd, &ps);
    		// TODO: Add any drawing code here...
    		EndPaint(hWnd, &ps);
    		break;
    	case WM_DESTROY:
    		PostQuitMessage(0);
    		break;
    	default:
    		return DefWindowProc(hWnd, message, wParam, lParam);
    	}
    	return 0;
    }
    
    // Message handler for about box.
    INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
    {
    	UNREFERENCED_PARAMETER(lParam);
    	switch (message)
    	{
    	case WM_INITDIALOG:
    		return (INT_PTR)TRUE;
    
    	case WM_COMMAND:
    		if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
    		{
    			EndDialog(hDlg, LOWORD(wParam));
    			return (INT_PTR)TRUE;
    		}
    		break;
    	}
    	return (INT_PTR)FALSE;
    }

  2. #2
    VictorN's Avatar
    VictorN is offline Super Moderator Power Poster
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    Re: Why such small program don't send nothing through com-port?

    Did you debug your "small" program?
    Is the TempWrite() called? If "YES" then what does WriteFile return?
    Victor Nijegorodov

  3. #3
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    Re: Why such small program don't send nothing through com-port?

    VictorN, called and success

  4. #4
    VictorN's Avatar
    VictorN is offline Super Moderator Power Poster
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    Re: Why such small program don't send nothing through com-port?

    Then what is the value of Written
    Victor Nijegorodov

  5. #5
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    Re: Why such small program don't send nothing through com-port?

    VictorN, 256

  6. #6
    VictorN's Avatar
    VictorN is offline Super Moderator Power Poster
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    Re: Why such small program don't send nothing through com-port?

    Quote Originally Posted by AKE View Post
    VictorN, 256
    But it means that this program does send data to your com3 port!
    So why do you complain?
    Victor Nijegorodov

  7. #7
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    Re: Why such small program don't send nothing through com-port?

    VictorN, program on other computer don't catch this data, inspite of similar program send normally. I think problem in my program.

  8. #8
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    Re: Why such small program don't send nothing through com-port?

    Big sorry, I sent it on other port...

  9. #9
    VictorN's Avatar
    VictorN is offline Super Moderator Power Poster
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    Re: Why such small program don't send nothing through com-port?

    But first thing in such a case would be to check a cable.
    The second one - test your sender program with a null-modem cable using hyperterminal, then - check Windows firewall on both computers...
    Victor Nijegorodov

  10. #10
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    Re: Why such small program don't send nothing through com-port?

    VictorN, Thanks...

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