The following code demonstrates a simple media player application. It utilizes most of the functions available in the ltmmPlay object.
#define MAKE_MEDIA_PATH(pFileName) (TEXT("C:\\LEADTOOLS 17.5\\Media\\")TEXT(pFileName)) // include the LEAD Multimedia TOOLKIT header #include "ltmm.h" #include "resource.h" #include <tchar.h> #include <stdio.h> #include <math.h> #define SZ_WNDCLASS_PLAY _T("PLAY WNDCLASS") #define WM_PLAYNOTIFY (WM_USER + 1000) HINSTANCE g_hInstance; // application instance handle HWND g_hwndPlay; // video frame window IltmmPlay* g_pPlay; // play object interface pointer int g_nPositionView; // current position indicator view mode enum { POSITIONVIEW_TIME, POSITIONVIEW_FRAME, POSITIONVIEW_TRACKING }; // // SnapFrameToVideo // resizes the frame window to match the video width and height // void SnapFrameToVideo(void) { HWND hwnd; RECT rcWindow, rcClient; long cx, cy; // get the frame window g_pPlay->get_VideoWindowFrame((long*) &hwnd); // get the video dimensions g_pPlay->get_VideoWidth(&cx); g_pPlay->get_VideoHeight(&cy); // adjust by the border dimensions GetWindowRect(hwnd, &rcWindow); GetClientRect(hwnd, &rcClient); cx += ((rcWindow.right - rcWindow.left) - (rcClient.right - rcClient.left)); cy += ((rcWindow.bottom - rcWindow.top) - (rcClient.bottom - rcClient.top)); // resize the window SetWindowPos(hwnd, NULL, 0, 0, cx, cy, SWP_NOMOVE | SWP_NOZORDER); } // // FreeSource // resets source and frees asssociated resources // void FreeSource(void) { long type; VARIANT var; HGLOBAL hglobal; g_pPlay->get_SourceType(&type); if(type == ltmmPlay_Source_Array) { g_pPlay->get_SourceArray(&var); g_pPlay->ResetSource(); VariantClear(&var); } else if(type == ltmmPlay_Source_HGlobal) { g_pPlay->get_SourceHGlobal((long*) &hglobal); g_pPlay->ResetSource(); GlobalFree(hglobal); } else { g_pPlay->ResetSource(); } } // // SetSourceArray // preloads a SAFEARRAY with media data and assigns it to the play object // void SetSourceArray(void) { HRESULT hr; HANDLE hfile; DWORD size, cb; void* buffer; VARIANT var; SAFEARRAY* psaSource; // open the source file hfile = CreateFile(MAKE_MEDIA_PATH("source.avi"), GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL); if(hfile == INVALID_HANDLE_VALUE) return; // allocate same-sized SAFEARRAY size = GetFileSize(hfile, NULL); psaSource = SafeArrayCreateVector(VT_UI1, 0, size); if(!psaSource) { CloseHandle(hfile); return; } // read entire source into array SafeArrayAccessData(psaSource, (void**) &buffer); if(!ReadFile(hfile, buffer, size, &cb, NULL) || cb != size) { SafeArrayUnaccessData(psaSource); CloseHandle(hfile); SafeArrayDestroy(psaSource); return; } SafeArrayUnaccessData(psaSource); // close file CloseHandle(hfile); // assign the source array VariantInit(&var); V_VT(&var) = (VT_ARRAY | VT_UI1); V_ARRAY(&var) = psaSource; hr = g_pPlay->put_SourceArray(var); if(FAILED(hr)) { SafeArrayDestroy(psaSource); return; } } // // SetSourceArray // preloads global memory with media data and assigns it to the play object // void SetSourceHGlobal(void) { HRESULT hr; HANDLE hfile; DWORD size, cb; void* buffer; HGLOBAL hglobal; // open the source file hfile = CreateFile(MAKE_MEDIA_PATH("source.avi"), GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL); if(hfile == INVALID_HANDLE_VALUE) return; // allocate same-sized global memory size = GetFileSize(hfile, NULL); hglobal = GlobalAlloc(GMEM_MOVEABLE, size); if(!hglobal) { CloseHandle(hfile); return; } // read entire source into memory buffer = GlobalLock(hglobal); if(!ReadFile(hfile, buffer, size, &cb, NULL) || cb != size) { GlobalUnlock(hglobal); CloseHandle(hfile); GlobalFree(hglobal); return; } GlobalUnlock(hglobal); // close file CloseHandle(hfile); hr = g_pPlay->put_SourceHGlobal((long) hglobal); if(FAILED(hr)) { GlobalFree(hglobal); return; } } // // PlayWndProc // video frame window procedure // LRESULT CALLBACK PlayWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { BSTR bstr; VARIANT_BOOL f; long l; TCHAR sz[2048]; LPTSTR p; double d; HRESULT hr; ltmmSizeMode sm; long x, y, cx, cy; RECT rc; POINT pt; HGLOBAL hDIB; IPictureDisp* pPictureDisp; switch (message) { case WM_CREATE: g_hwndPlay = hwnd; // window is the video window frame g_pPlay->put_VideoWindowFrame((long) hwnd); // want notification messages as well g_pPlay->SetNotifyWindow((long) hwnd, WM_PLAYNOTIFY); // make sure we start playing immediately g_pPlay->put_AutoStart(VARIANT_TRUE); // set the source file bstr = SysAllocString(MAKE_MEDIA_PATH("source.avi")); hr = g_pPlay->put_SourceFile(bstr); SysFreeString(bstr); if(SUCCEEDED(hr)) { g_pPlay->get_UnrenderedStreams(&l); if(l != 0) MessageBox(hwnd, _T("Not all the streams could be rendered."), _T("Play"), MB_ICONEXCLAMATION | MB_OK); } SnapFrameToVideo(); return 0; break; case WM_INITMENUPOPUP: if(GetSubMenu(GetMenu(hwnd), 0) == (HMENU)wParam) { // enable menu items based on the play object state g_pPlay->get_State(&l); EnableMenuItem((HMENU) wParam, ID_CONTROL_PLAY, (l == ltmmPlay_State_Paused || l == ltmmPlay_State_Stopped) ? MF_ENABLED : MF_GRAYED); EnableMenuItem((HMENU) wParam, ID_CONTROL_PAUSE, (l == ltmmPlay_State_Running) ? MF_ENABLED : MF_GRAYED); EnableMenuItem((HMENU) wParam, ID_CONTROL_STOP, (l == ltmmPlay_State_Running || l == ltmmPlay_State_Paused) ? MF_ENABLED : MF_GRAYED); // enable menu items based on seeking capabilities g_pPlay->CheckSeekingCapabilities(ltmmPlay_Seeking_Forward | ltmmPlay_Seeking_Backward | ltmmPlay_Seeking_FrameForward | ltmmPlay_Seeking_FrameBackward, &l); EnableMenuItem((HMENU) wParam, ID_CONTROL_SEEKSTART, (l & ltmmPlay_Seeking_Backward) ? MF_ENABLED : MF_GRAYED); EnableMenuItem((HMENU) wParam, ID_CONTROL_SEEKEND, (l & ltmmPlay_Seeking_Forward) ? MF_ENABLED : MF_GRAYED); EnableMenuItem((HMENU) wParam, ID_CONTROL_NEXTFRAME, (l & ltmmPlay_Seeking_FrameForward) ? MF_ENABLED : MF_GRAYED); EnableMenuItem((HMENU) wParam, ID_CONTROL_PREVIOUSFRAME, (l & ltmmPlay_Seeking_FrameBackward) ? MF_ENABLED : MF_GRAYED); EnableMenuItem((HMENU) wParam, ID_CONTROL_SEEKSELECTIONSTART, (l & (ltmmPlay_Seeking_Forward | ltmmPlay_Seeking_Backward)) ? MF_ENABLED : MF_GRAYED); EnableMenuItem((HMENU) wParam, ID_CONTROL_SEEKSELECTIONEND, (l & (ltmmPlay_Seeking_Forward | ltmmPlay_Seeking_Backward)) ? MF_ENABLED : MF_GRAYED); EnableMenuItem((HMENU) wParam, ID_CONTROL_LASTFRAME, (l & ltmmPlay_Seeking_FrameForward) ? MF_ENABLED : MF_GRAYED); EnableMenuItem((HMENU) wParam, ID_CONTROL_FIRSTFRAME, (l & ltmmPlay_Seeking_FrameBackward) ? MF_ENABLED : MF_GRAYED); EnableMenuItem((HMENU) wParam, ID_CONTROL_STEPFORWARD1SEC, (l & ltmmPlay_Seeking_Forward) ? MF_ENABLED : MF_GRAYED); EnableMenuItem((HMENU) wParam, ID_CONTROL_STEPFORWARD10, (l & ltmmPlay_Seeking_Forward) ? MF_ENABLED : MF_GRAYED); // check the current speed g_pPlay->get_Rate(&d); CheckMenuItem((HMENU) wParam, ID_CONTROL_HALFSPEED, (fabs(d - 0.5) < 0.1) ? MF_CHECKED : MF_UNCHECKED); CheckMenuItem((HMENU) wParam, ID_CONTROL_NORMALSPEED, (fabs(d - 1.0) < 0.1) ? MF_CHECKED : MF_UNCHECKED); // check the current video size mode g_pPlay->get_VideoWindowSizeMode(&sm); CheckMenuItem((HMENU) wParam, ID_CONTROL_FITTOWINDOW, (sm == ltmmFit) ? MF_CHECKED : MF_UNCHECKED); CheckMenuItem((HMENU) wParam, ID_CONTROL_STRETCHTOWINDOW, (sm == ltmmStretch) ? MF_CHECKED : MF_UNCHECKED); // enable volume menu items g_pPlay->get_Volume(&l); EnableMenuItem((HMENU) wParam, ID_CONTROL_INCREASEVOLUME, (l < 0) ? MF_ENABLED : MF_GRAYED); EnableMenuItem((HMENU) wParam, ID_CONTROL_DECREASEVOLUME, (l > -10000) ? MF_ENABLED : MF_GRAYED); // enable balance menu items g_pPlay->get_Balance(&l); EnableMenuItem((HMENU) wParam, ID_CONTROL_PANRIGHT, (l < 10000) ? MF_ENABLED : MF_GRAYED); EnableMenuItem((HMENU) wParam, ID_CONTROL_PANLEFT, (l > -10000) ? MF_ENABLED : MF_GRAYED); // check mute g_pPlay->get_Mute(&f); CheckMenuItem((HMENU) wParam, ID_CONTROL_MUTE, f ? MF_CHECKED : MF_UNCHECKED); // check auto rewind g_pPlay->get_AutoRewind(&f); CheckMenuItem((HMENU) wParam, ID_CONTROL_AUTOREWIND, f ? MF_CHECKED : MF_UNCHECKED); // check loop g_pPlay->get_PlayCount(&l); CheckMenuItem((HMENU) wParam, ID_CONTROL_LOOP, (l == 0) ? MF_CHECKED : MF_UNCHECKED); // enable processors g_pPlay->HasDialog(ltmmPlay_Dlg_VideoProcessors, &f); EnableMenuItem((HMENU) wParam, ID_CONTROL_PROCESSORS_VIDEO, f ? MF_ENABLED : MF_GRAYED); g_pPlay->HasDialog(ltmmPlay_Dlg_AudioProcessors, &f); EnableMenuItem((HMENU) wParam, ID_CONTROL_PROCESSORS_AUDIO, f ? MF_ENABLED : MF_GRAYED); // check source g_pPlay->get_SourceType(&l); CheckMenuItem((HMENU) wParam, ID_CONTROL_SOURCE_FILE, (l == ltmmPlay_Source_File) ? MF_CHECKED : MF_UNCHECKED); CheckMenuItem((HMENU) wParam, ID_CONTROL_SOURCE_ARRAY, (l == ltmmPlay_Source_Array) ? MF_CHECKED : MF_UNCHECKED); CheckMenuItem((HMENU) wParam, ID_CONTROL_SOURCE_HGLOBAL, (l == ltmmPlay_Source_HGlobal) ? MF_CHECKED : MF_UNCHECKED); g_pPlay->get_AutoStart(&f); CheckMenuItem((HMENU) wParam, ID_CONTROL_AUTOSTART, f ? MF_CHECKED : MF_UNCHECKED); // check position view CheckMenuItem((HMENU) wParam, ID_CONTROL_POSITIONVIEW_FRAME, (g_nPositionView == POSITIONVIEW_FRAME) ? MF_CHECKED : MF_UNCHECKED); CheckMenuItem((HMENU) wParam, ID_CONTROL_POSITIONVIEW_TIME, (g_nPositionView == POSITIONVIEW_TIME) ? MF_CHECKED : MF_UNCHECKED); CheckMenuItem((HMENU) wParam, ID_CONTROL_POSITIONVIEW_TRACKING, (g_nPositionView == POSITIONVIEW_TRACKING) ? MF_CHECKED : MF_UNCHECKED); // enable still options g_pPlay->get_RenderedStreams(&l); EnableMenuItem((HMENU) wParam, ID_CONTROL_COPYDIB, (l & ltmmPlay_Stream_Video) ? MF_ENABLED : MF_GRAYED); EnableMenuItem((HMENU) wParam, ID_CONTROL_SAVEPICTURE, (l & ltmmPlay_Stream_Video) ? MF_ENABLED : MF_GRAYED); } break; case WM_PLAYNOTIFY: switch(wParam) { case ltmmPlay_Notify_TrackingSelectionChanged: break; case ltmmPlay_Notify_TrackingPositionChanged: p = sz; *p = _T('\0'); g_pPlay->get_RenderedStreams(&l); if((l & ltmmPlay_Stream_Audio) && !(l & ltmmPlay_Stream_Video)) { // audio only stream if(p != sz) p += _stprintf(p, _T(", ")); p += _stprintf(p, _T("Audio")); } else if(l & ltmmPlay_Stream_Midi) { // midi stream if(p != sz) p += _stprintf(p, _T(", ")); p += _stprintf(p, _T("Midi")); } if(g_nPositionView == POSITIONVIEW_TRACKING)// tracking position based { // display current tracking position hr = g_pPlay->get_CurrentTrackingPosition(&l); if(SUCCEEDED(hr)) { if(p != sz) p += _stprintf(p, _T(", ")); p += _stprintf(p, _T("Trk. Pos.: %d"), l); } // display current tracking selection start hr = g_pPlay->get_TrackingSelectionStart(&l); if(SUCCEEDED(hr)) { if(p != sz) p += _stprintf(p, _T(", ")); p += _stprintf(p, _T("Trk. Start: %d"), l); } // display current tracking selection end hr= g_pPlay->get_TrackingSelectionEnd(&l); if(SUCCEEDED(hr)) { if(p != sz) p += _stprintf(p, _T(", ")); p += _stprintf(p, _T("Trk. End: %d"), l); } } else if(g_nPositionView == POSITIONVIEW_FRAME)// frame based { // display current frame position hr = g_pPlay->get_CurrentFramePosition(&l); if(SUCCEEDED(hr)) { if(p != sz) p += _stprintf(p, _T(", ")); p += _stprintf(p, _T("Frame: %d"), l + 1); } // display total number of frames hr = g_pPlay->get_FrameDuration(&l); if(SUCCEEDED(hr)) { if(p != sz) p += _stprintf(p, _T(", ")); p += _stprintf(p, _T("Total Frames: %d"), l); } } else // time based { // display the current position hr = g_pPlay->get_CurrentPosition(&d); if(SUCCEEDED(hr)) { if(p != sz) p += _stprintf(p, _T(", ")); p += _stprintf(p, _T("Position: %f"), d); } // display the total duration hr = g_pPlay->get_Duration(&d); if(SUCCEEDED(hr)) { if(p != sz) p += _stprintf(p, _T(", ")); p += _stprintf(p, _T("Duration: %f"), d); } // display current selection start hr = g_pPlay->get_SelectionStart(&d); if(SUCCEEDED(hr)) { if(p != sz) p += _stprintf(p, _T(", ")); p += _stprintf(p, _T("Start: %f"), d); } // display current selection end hr = g_pPlay->get_SelectionEnd(&d); if(SUCCEEDED(hr)) { if(p != sz) p += _stprintf(p, _T(", ")); p += _stprintf(p, _T("End: %f"), d); } } SetWindowText(hwnd, sz); break; case ltmmPlay_Notify_StateChanged: switch(LOWORD(lParam)) { case ltmmPlay_State_NotReady: _stprintf(sz, _T("Not Ready")); SetWindowText(hwnd, sz); break; case ltmmPlay_State_Stopped: // uncomment the following line to view the the graph in DirectShow GraphEdit // g_pPlay->EditGraph(); g_pPlay->get_SourceType(&l); if(l == ltmmPlay_Source_Array) { _stprintf(sz, _T("Stopped - [array]")); } else if(l == ltmmPlay_Source_HGlobal) { _stprintf(sz, _T("Stopped - [hglobal]")); } else { g_pPlay->get_SourceFile(&bstr); _stprintf(sz, _T("Stopped - [%ls]"), bstr); SysFreeString(bstr); } SetWindowText(hwnd, sz); break; case ltmmPlay_State_Paused: g_pPlay->get_SourceType(&l); if(l == ltmmPlay_Source_Array) { _stprintf(sz, _T("Paused - [array]")); } else if(l == ltmmPlay_Source_HGlobal) { _stprintf(sz, _T("Paused - [hglobal]")); } else { g_pPlay->get_SourceFile(&bstr); _stprintf(sz, _T("Paused - [%ls]"), bstr); SysFreeString(bstr); } SetWindowText(hwnd, sz); break; case ltmmPlay_State_Running: _stprintf(sz, _T("Playing")); SetWindowText(hwnd, sz); break; } break; case ltmmPlay_Notify_Error: _stprintf(sz, _T("Error 0x%.8X. Playback stopped."), lParam); MessageBox(hwnd, sz, _T("Play"), MB_ICONEXCLAMATION | MB_OK); break; } return 0; break; case WM_KEYDOWN: if(wParam == VK_ESCAPE) { // if fullscreen mode then exit it g_pPlay->get_FullScreenMode(&f); if(f) { g_pPlay->put_FullScreenMode(VARIANT_FALSE); return 0; } } break; case WM_DESTROY: FreeSource(); // no more notifications g_pPlay->SetNotifyWindow((long) NULL, 0); PostQuitMessage(0); break; case WM_COMMAND: switch(LOWORD(wParam)) { case ID_CONTROL_POSITIONVIEW_TIME: g_nPositionView = POSITIONVIEW_TIME; break; case ID_CONTROL_POSITIONVIEW_FRAME: g_nPositionView = POSITIONVIEW_FRAME; break; case ID_CONTROL_POSITIONVIEW_TRACKING: g_nPositionView = POSITIONVIEW_TRACKING; break; case ID_CONTROL_AUTOSTART: // toggle auto start g_pPlay->get_AutoStart(&f); g_pPlay->put_AutoStart(f ? VARIANT_FALSE : VARIANT_TRUE); return 0; break; case ID_CONTROL_PLAY: // play file g_pPlay->Run(); return 0; break; case ID_CONTROL_PAUSE: // pause playback g_pPlay->Pause(); return 0; break; case ID_CONTROL_STOP: // stop playback g_pPlay->Stop(); return 0; break; case ID_CONTROL_HALFSPEED: // set to half the normal playback speed g_pPlay->put_Rate(0.5); return 0; break; case ID_CONTROL_NORMALSPEED: // set to normal speed g_pPlay->put_Rate(1.0); return 0; break; case ID_CONTROL_SEEKSTART: // seek to file start g_pPlay->SeekStart(); return 0; break; case ID_CONTROL_SEEKEND: // seek to file end g_pPlay->SeekEnd(); return 0; break; case ID_CONTROL_SEEKSELECTIONSTART: // seek to the start of the current selection g_pPlay->SeekSelectionStart(); return 0; break; case ID_CONTROL_SEEKSELECTIONEND: // seek to the end of the current selection g_pPlay->SeekSelectionEnd(); return 0; break; case ID_CONTROL_SETSELECTIONSTART: // set the start of the selection to the current position g_pPlay->MarkSelectionStart(); return 0; break; case ID_CONTROL_SETSELECTIONEND: // set the end of the selection to the current position g_pPlay->MarkSelectionEnd(); return 0; break; case ID_CONTROL_CLEARSELECTION: // clear the current selection g_pPlay->get_Duration(&d); g_pPlay->put_SelectionStart(0.0); g_pPlay->put_SelectionEnd(d); return 0; break; case ID_CONTROL_NEXTFRAME: // goto the next frame g_pPlay->NextFrame(); return 0; break; case ID_CONTROL_PREVIOUSFRAME: // goto the previous frame g_pPlay->PreviousFrame(); return 0; break; case ID_CONTROL_FIRSTFRAME: // goto to the first frame g_pPlay->put_CurrentFramePosition(0); return 0; break; case ID_CONTROL_LASTFRAME: // goto to the last frame g_pPlay->get_FrameDuration(&l); g_pPlay->put_CurrentFramePosition(l - 1); return 0; break; case ID_CONTROL_STEPFORWARD1SEC: // step forward 1 seconds g_pPlay->get_CurrentPosition(&d); g_pPlay->put_CurrentPosition(d + 1.0); return 0; break; case ID_CONTROL_STEPFORWARD10: // step forward 10% g_pPlay->get_CurrentTrackingPosition(&l); g_pPlay->put_CurrentTrackingPosition(l + 1000); return 0; break; case ID_CONTROL_FITTOWINDOW: // fit the video to the window g_pPlay->put_VideoWindowSizeMode(ltmmFit); return 0; break; case ID_CONTROL_STRETCHTOWINDOW: // stretch the video to the window g_pPlay->put_VideoWindowSizeMode(ltmmStretch); return 0; break; case ID_CONTROL_MUTE: // toggle mute g_pPlay->get_Mute(&f); g_pPlay->put_Mute(f ? VARIANT_FALSE : VARIANT_TRUE); return 0; break; case ID_CONTROL_INCREASEVOLUME: // increase the volume g_pPlay->get_Volume(&l); g_pPlay->put_Volume(min(0, l + 300)); return 0; break; case ID_CONTROL_DECREASEVOLUME: // decrease the volume g_pPlay->get_Volume(&l); g_pPlay->put_Volume(max(-10000, l - 300)); return 0; break; case ID_CONTROL_PANRIGHT: // pan balance to the right g_pPlay->get_Balance(&l); g_pPlay->put_Balance(min(10000, l + 300)); return 0; break; case ID_CONTROL_PANLEFT: // pan balance to the left g_pPlay->get_Balance(&l); g_pPlay->put_Balance(max(-10000, l - 300)); return 0; break; case ID_CONTROL_LOOP: // toggle looping g_pPlay->get_PlayCount(&l); g_pPlay->put_PlayCount(l ? 0 : 1); return 0; break; case ID_CONTROL_FULLSCREEN: // togglr fullscreen mode g_pPlay->ToggleFullScreenMode(); return 0; break; case ID_CONTROL_AUTOREWIND: // toggle auto rewind g_pPlay->get_AutoRewind(&f); g_pPlay->put_AutoRewind(f ? VARIANT_FALSE : VARIANT_TRUE); return 0; break; case ID_CONTROL_PROCESSORS_VIDEO: // invoke video processor dialog box g_pPlay->ShowDialog(ltmmPlay_Dlg_VideoProcessors, (long) hwnd); return 0; break; case ID_CONTROL_PROCESSORS_AUDIO: // invoke audio processor dialog box g_pPlay->ShowDialog(ltmmPlay_Dlg_AudioProcessors, (long) hwnd); return 0; break; case ID_CONTROL_SOURCE_FILE: // set the source file FreeSource(); bstr = SysAllocString(MAKE_MEDIA_PATH("source.avi")); g_pPlay->put_SourceFile(bstr); SysFreeString(bstr); SnapFrameToVideo(); return 0; break; case ID_CONTROL_SOURCE_ARRAY: // set the source array FreeSource(); SetSourceArray(); SnapFrameToVideo(); return 0; break; case ID_CONTROL_SOURCE_HGLOBAL: // set the source hglobal FreeSource(); SetSourceHGlobal(); SnapFrameToVideo(); return 0; break; case ID_CONTROL_MEDIAINFORMATION: // display available media information p = sz; g_pPlay->get_Title(&bstr); p += _stprintf(p, _T("Title = '%ls'"), bstr ? bstr : L""); SysFreeString(bstr); g_pPlay->get_Author(&bstr); p += _stprintf(p, _T(", Author = '%ls'"), bstr ? bstr : L""); SysFreeString(bstr); g_pPlay->get_Copyright(&bstr); p += _stprintf(p, _T(", Copyright = '%ls'"), bstr ? bstr : L""); SysFreeString(bstr); g_pPlay->get_Description(&bstr); p += _stprintf(p, _T(", Description = '%ls'"), bstr ? bstr : L""); SysFreeString(bstr); g_pPlay->get_Rating(&bstr); p += _stprintf(p, _T(", Rating = '%ls'"), bstr ? bstr : L""); SysFreeString(bstr); MessageBox(hwnd, sz, _T("Media Information"), MB_OK); return 0; break; case ID_CONTROL_COPYDIB: // device independent bitmap hr = g_pPlay->GetStillDIB(5000, (long*) &hDIB); if(SUCCEEDED(hr)) { // copy to the clipboard OpenClipboard(hwnd); EmptyClipboard(); SetClipboardData(CF_DIB, hDIB); CloseClipboard(); } return 0; break; case ID_CONTROL_SAVEPICTURE: // ole picture object hr = g_pPlay->GetStillPicture(5000, &pPictureDisp); if(SUCCEEDED(hr)) { // save the picture bstr = SysAllocString(MAKE_MEDIA_PATH("still.bmp")); OleSavePictureFile(pPictureDisp, bstr); SysFreeString(bstr); pPictureDisp->Release(); } return 0; break; } break; case WM_LBUTTONDOWN: // perform play/pause if the user clicks in the video window g_pPlay->get_VideoWindowLeft(&x); g_pPlay->get_VideoWindowTop(&y); g_pPlay->get_VideoWindowWidth(&cx); g_pPlay->get_VideoWindowHeight(&cy); SetRect(&rc, x, y, x + cx, y + cy); pt.x = (short) LOWORD(lParam); pt.y = (short) HIWORD(lParam); if(PtInRect(&rc, pt)) { g_pPlay->get_State(&l); if(l == ltmmPlay_State_Stopped || l == ltmmPlay_State_Paused) g_pPlay->Run(); else if(l == ltmmPlay_State_Running) g_pPlay->Pause(); } return 0; break; } return DefWindowProc(hwnd, message, wParam, lParam); } int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { MSG msg; HRESULT hr; WNDCLASSEX wcex; g_hInstance = hInstance; // initialize COM library hr = CoInitialize(NULL); if(FAILED(hr)) goto error; // register the video frame window class wcex.cbSize = sizeof(WNDCLASSEX); wcex.style = CS_HREDRAW | CS_VREDRAW; wcex.lpfnWndProc = PlayWndProc; wcex.cbClsExtra = 0; wcex.cbWndExtra = 0; wcex.hInstance = g_hInstance; wcex.hIcon = NULL; wcex.hCursor = LoadCursor(NULL, IDC_ARROW); wcex.hbrBackground = (HBRUSH)(COLOR_APPWORKSPACE + 1); wcex.lpszMenuName = (LPCWSTR)IDR_MENU; wcex.lpszClassName = SZ_WNDCLASS_PLAY; wcex.hIconSm = NULL; if(!RegisterClassEx(&wcex)) goto error; // create the play object hr = CoCreateInstance(CLSID_ltmmPlay, NULL, CLSCTX_INPROC_SERVER, IID_IltmmPlay, (void**) &g_pPlay); if(FAILED(hr)) goto error; // create the video frame window if(!CreateWindow(SZ_WNDCLASS_PLAY, _T("Play"), WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, g_hInstance, NULL)) goto error; ShowWindow(g_hwndPlay, nCmdShow); UpdateWindow(g_hwndPlay); // process until done while (GetMessage(&msg, NULL, 0, 0)) { TranslateMessage(&msg); DispatchMessage(&msg); } error: if(g_pPlay) g_pPlay->Release(); CoUninitialize(); return 0; }