Has anyone worked with...

This is a discussion on Has anyone worked with... within the Windows Programming forums, part of the Platform Specific Boards category; Has anyone ever worked with progress bars? I am wanting to use them, but I am practicing progressing the bar ...

  1. #1
    Programming is fun, mkay?
    Join Date
    Oct 2001
    Posts
    490

    Question Has anyone worked with...

    Has anyone ever worked with progress bars? I am wanting to use them, but I am practicing progressing the bar while reading a file. I use CreateFile then read it. Here's some code:


    InitCommonControls();

    HWND hwndPB;

    HANDLE hFile; // handle of file
    DWORD cb; // size of file and count of bytes read
    LPCH pch; // address of data read from file
    LPCH pchTmp; // temporary pointer

    SendMessage(hwndPB, PBM_SETBARCOLOR, 0, RGB(16,26,150));

    // Ensure that the common control DLL is loaded and create a
    // progress bar along the bottom of the client area of the
    // parent window. Base the height of the progress bar on
    // the height of a scroll bar arrow.
    InitCommonControls();
    hwndPB = CreateWindowEx(0, PROGRESS_CLASS, (LPSTR) NULL,
    WS_CHILD | WS_VISIBLE, 0,
    0,
    400, 20,
    hwnd, (HMENU) 0, 0, NULL);

    // Open the file for reading, and retrieve the size of the file.
    hFile = CreateFile(lpszFileName, GENERIC_READ, FILE_SHARE_READ,
    (LPSECURITY_ATTRIBUTES) NULL, OPEN_EXISTING,
    FILE_ATTRIBUTE_NORMAL, (HANDLE) NULL);

    if (hFile == (HANDLE) INVALID_HANDLE_VALUE)
    return FALSE;

    cb = GetFileSize(hFile, (LPDWORD) NULL);

    // Set the range and increment of the progress bar.
    SendMessage(hwndPB, PBM_SETRANGE, 0, MAKELPARAM(0, cb / 2048));
    SendMessage(hwndPB, PBM_SETSTEP, (WPARAM) 1, 0);

    // Parse the file.
    pch = (LPCH) LocalAlloc(LPTR, sizeof(char) * 2048);
    pchTmp = pch;
    do {
    ReadFile(hFile, pchTmp, sizeof(char) * 2048, &cb,
    (LPOVERLAPPED) NULL);

    // Advance the current position of the progress bar
    // by the increment.
    SendMessage(hwndPB, PBM_STEPIT, cb, 0);
    } while (cb);

    When I do that, though, it shows a progress bar, but no progress from STEPIT. I have tried:

    SendMessage(hwndPB, PBM_STEPIT, 0, cb);

    but it doesn't work either. What do I do? I got most of the code from MSDN!
    Website(s): http://www16.brinkster.com/trifaze/

    E-mail: trifaze_mattu@lycos.com

    ---------------------------------
    C++ Environment: MSVC++ 6.0; Dev-C++ 4.0/4.1
    DirectX Version: 9.0b
    DX SDK: DirectX 8.1 SDK

  2. #2
    train spotter
    Join Date
    Aug 2001
    Location
    near a computer
    Posts
    3,859
    Try adding a paint msg.

    UpdateWindow()

    I use
    Code:
    for(i=0;i<Steps;i++)
    {
       SendMessage( GetDlgItem(hwndPB,IDC_PROGRESS), PBM_STEPIT, (WPARAM) 0, 0);
    My hwndPB is of the dialog containing the progress bar though, you would use your hwndPB.

    Read the help as to what the (HMENU) parameter of the CreateWindowEx() should be. I think this will also be causing a problem.
    //edit
    Thats right you use bloodshed
    This is from MSVC

    "For a child window, hMenu specifies the child-window identifier, an integer value used by a dialog box control to notify its parent about events. The application determines the child-window identifier; it must be unique for all child windows with the same parent window."

    The progress is a child of the dialog. Can you be 100% it does not have another ctrl with ID = 0?
    Use a hash define and check for confilcts in your resource.h
    Last edited by novacain; 12-13-2001 at 12:47 AM.
    "Man alone suffers so excruciatingly in the world that he was compelled to invent laughter."
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