Annonceindlæg fra Infor
22. februar 2002 - 13:29
#1
Følgende eks. er fra Charles Petzold's bog "Programming Windows, 5. ed": /*---------------------------------------- RECORD3.C -- Waveform Audio Recorder (c) Charles Petzold, 1998 ----------------------------------------*/ #include <windows.h> #include "..\\record1\\resource.h" BOOL CALLBACK DlgProc (HWND, UINT, WPARAM, LPARAM) ; TCHAR szAppName [] = TEXT ("Record3") ; int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) { if (-1 == DialogBox (hInstance, TEXT ("Record"), NULL, DlgProc)) { MessageBox (NULL, TEXT ("This program requires Windows NT!"), szAppName, MB_ICONERROR) ; } return 0 ; } BOOL mciExecute (LPCTSTR szCommand) { MCIERROR error ; TCHAR szErrorStr [1024] ; if (error = mciSendString (szCommand, NULL, 0, NULL)) { mciGetErrorString (error, szErrorStr, sizeof (szErrorStr) / sizeof (TCHAR)) ; MessageBeep (MB_ICONEXCLAMATION) ; MessageBox (NULL, szErrorStr, TEXT ("MCI Error"), MB_OK | MB_ICONEXCLAMATION) ; } return error == 0 ; } BOOL CALLBACK DlgProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { static BOOL bRecording, bPlaying, bPaused ; switch (message) { case WM_COMMAND: switch (wParam) { case IDC_RECORD_BEG: // Delete existing waveform file DeleteFile (TEXT ("record3.wav")) ; // Open waveform audio and record if (!mciExecute (TEXT ("open new type waveaudio alias mysound"))) return TRUE ; mciExecute (TEXT ("record mysound")) ; // Enable and disable buttons EnableWindow (GetDlgItem (hwnd, IDC_RECORD_BEG), FALSE); EnableWindow (GetDlgItem (hwnd, IDC_RECORD_END), TRUE) ; EnableWindow (GetDlgItem (hwnd, IDC_PLAY_BEG), FALSE); EnableWindow (GetDlgItem (hwnd, IDC_PLAY_PAUSE), FALSE); EnableWindow (GetDlgItem (hwnd, IDC_PLAY_END), FALSE); SetFocus (GetDlgItem (hwnd, IDC_RECORD_END)) ; bRecording = TRUE ; return TRUE ; case IDC_RECORD_END: // Stop, save, and close recording mciExecute (TEXT ("stop mysound")) ; mciExecute (TEXT ("save mysound record3.wav")) ; mciExecute (TEXT ("close mysound")) ; // Enable and disable buttons EnableWindow (GetDlgItem (hwnd, IDC_RECORD_BEG), TRUE) ; EnableWindow (GetDlgItem (hwnd, IDC_RECORD_END), FALSE); EnableWindow (GetDlgItem (hwnd, IDC_PLAY_BEG), TRUE) ; EnableWindow (GetDlgItem (hwnd, IDC_PLAY_PAUSE), FALSE); EnableWindow (GetDlgItem (hwnd, IDC_PLAY_END), FALSE); SetFocus (GetDlgItem (hwnd, IDC_PLAY_BEG)) ; bRecording = FALSE ; return TRUE ; case IDC_PLAY_BEG: // Open waveform audio and play if (!mciExecute (TEXT ("open record3.wav alias mysound"))) return TRUE ; mciExecute (TEXT ("play mysound")) ; // Enable and disable buttons EnableWindow (GetDlgItem (hwnd, IDC_RECORD_BEG), FALSE); EnableWindow (GetDlgItem (hwnd, IDC_RECORD_END), FALSE); EnableWindow (GetDlgItem (hwnd, IDC_PLAY_BEG), FALSE); EnableWindow (GetDlgItem (hwnd, IDC_PLAY_PAUSE), TRUE) ; EnableWindow (GetDlgItem (hwnd, IDC_PLAY_END), TRUE) ; SetFocus (GetDlgItem (hwnd, IDC_PLAY_END)) ; bPlaying = TRUE ; return TRUE ; case IDC_PLAY_PAUSE: if (!bPaused) // Pause the play { mciExecute (TEXT ("pause mysound")) ; SetDlgItemText (hwnd, IDC_PLAY_PAUSE, TEXT ("Resume")) ; bPaused = TRUE ; } else // Begin playing again { mciExecute (TEXT ("play mysound")) ; SetDlgItemText (hwnd, IDC_PLAY_PAUSE, TEXT ("Pause")) ; bPaused = FALSE ; } return TRUE ; case IDC_PLAY_END: // Stop and close mciExecute (TEXT ("stop mysound")) ; mciExecute (TEXT ("close mysound")) ; // Enable and disable buttons EnableWindow (GetDlgItem (hwnd, IDC_RECORD_BEG), TRUE) ; EnableWindow (GetDlgItem (hwnd, IDC_RECORD_END), FALSE); EnableWindow (GetDlgItem (hwnd, IDC_PLAY_BEG), TRUE) ; EnableWindow (GetDlgItem (hwnd, IDC_PLAY_PAUSE), FALSE); EnableWindow (GetDlgItem (hwnd, IDC_PLAY_END), FALSE); SetFocus (GetDlgItem (hwnd, IDC_PLAY_BEG)) ; bPlaying = FALSE ; bPaused = FALSE ; return TRUE ; } break ; case WM_SYSCOMMAND: switch (wParam) { case SC_CLOSE: if (bRecording) SendMessage (hwnd, WM_COMMAND, IDC_RECORD_END, 0L); if (bPlaying) SendMessage (hwnd, WM_COMMAND, IDC_PLAY_END, 0L) ; EndDialog (hwnd, 0) ; return TRUE ; } break ; } return FALSE ; }