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Progress bar and redetecting a device

Posted on 2003-12-10
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Last Modified: 2010-08-05
Hi,

I have this problem...
I have a function (I'm using VC++ 6.0) for detecting COM Ports and showing the progress while detecting.  It works fine but when the second time I call this function.  The progress bar won't show correctly.

First I call "CreateThread" to create a thread to take care of progress bar.  And then, I keep going on detecting COM Ports.  The progress function is a dialog...so I update the progress by calling "SendMessage" and "GetDlgItem"

However, it seems the progress function stucks before I call GetDlgItem...so the whole function won't have the correct handle....Hence, it won't update the progress bar.

My problem is how can I make some adjustments to make this function work?  Or is there any codes I can reference to?  Or some codes I can study?  I don't know if I explain well but please help me!!!  >"<

Xenia
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Question by:xenia27
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3 Comments
 
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Accepted Solution

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AlexFM earned 2000 total points
ID: 9918335
Please show your code.
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Author Comment

by:xenia27
ID: 9918716
Can I send the codes to your email address??  I guess this will be better..thanks...^^
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Author Comment

by:xenia27
ID: 9919324
Ok..here is the codes

first I call CreateThread like this
MainFunc
DlgThread = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE )ProgressDlg, NULL, 0, &ThreadID);

if (DlgThread != NULL)
  CloseHandle(DlgThread);

Then, I continue doing the detecting part with for loops..and each for-loop, I update the the progress with this
SendMessage(hwndPB, PBM_SETPOS, 50, 0); or
SendMessage(hwndPB, PBM_SETPOS, 100, 0);  Depends on the progress..
***********************************************************
The function of "ProgressDlg" is mainly calling a dialog "DialogBox(hInst, (LPCSTR)IDD_DetectProgress, gHwnd, ProgressDlgProc);"

***********************************************************
The function of "ProgressDlgProc":
BOOL CALLBACK ProgressDlgProc(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch(message)
    {
          case WM_INITDIALOG:
                        hwndDlg = hDlg;
                        hwndPB = GetDlgItem(hDlg, IDC_DetectProgress);
                        StopForProgressBar = FALSE;
                        SendMessage(hwndPB, PBM_SETRANGE, 0, MAKELPARAM(0, 100));
                        SendMessage(hwndPB, PBM_SETSTEP, (WPARAM) 1, 0);
                  return 0;
      }

      return FALSE;
}

************************************************************

First time I call MainFunc is working fine but the second time I call it...it will detect COM Port correctly; however, the progress won't show at all..only the dialog box but no progress...I have no idea what's wrong?  Please help me to solve this problem...Thanks a lot!!!


Xenia
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