Parent Application Freezing

I'm creating a C++ Plugin for FileMaker and I'm using the Chilkat FTP Library.

I am showing a progress dialog in a new thread and performing the FTP Download asynchronously but the application still freezes and shows as not responding, but with my progress dialog showing the download is actually working.

I have seen all of the discusions about using while ( PeekMessage ( &msg, NULL, 0, 0, PM_REMOVE ) etc, but that doesn't seem to help.

If anyone has any suggestions I would be very grateful.

Here is my code:

Code:

---

success = ftp.AsyncGetFileStart(sRemote,sLocal2);
        if (success != true) {
                //Error
                return err;
        }
        if (bProgress)
        {
                hThread = CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)ThreadFTPProgress,NULL,0,(LPDWORD)&iID);
        }
        while (ftp.get_AsyncFinished() != true)
        {
                if (bProgress)
                {
                        int iPercent = int( 100.0 * ftp.get_AsyncBytesReceived() / fileSize);
                        if ((iPercent > 0) && (iPercent < 101))
                        {
                                SendMessage(pgHWNDFTP, (UINT)PBM_SETPOS, (WPARAM)iPercent,0);
                        }
                }
                DoEvents();
                ftp.SleepMs(500);
        }
        if (bProgress)
        {
                EndDialog(pbHWNDFTP,0);
        }
        if (ftp.get_AsyncSuccess() == true) {
                //Download Successful
        }
        }
        ftp.Disconnect();

long WINAPI ThreadFTPProgress(long lparam)
{
        DialogBox((HINSTANCE)(gFMX_ExternCallPtr->instanceID),MAKEINTRESOURCE(DLG_PROGRESS),FMWnd,FTPProgressDialogProc);
        return 0;
}

---

Did you tried to debug the application with a breakpoint?

if no, then first debug your program by putting a breakpoint in the suspected area, and step through the code line by line.

If yes, then what you've got result? In which line/part of the code does it get crashing... what are the values of different variables at that time? did you tried by adding watch to those variables and notice the values of variables at different times?