MCI コマンド-MCI_SEEK_PARMS(前進)

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// GT_HelloWorldWin32.cpp // compile with: /D_UNICODE /DUNICODE /DWIN32 /D_WINDOWS /c   #include <windows.h> #include <stdlib.h> #include <string.h> #include <tchar.h>   #pragma comment(lib,"winmm") // Global variables   // The main window class name. static TCHAR szWindowClass[] = _T("win32app");   // The string that appears in the application's title bar. static TCHAR szTitle[] = _T("Win32 Guided Tour Application");   HINSTANCE hInst;   // Forward declarations of functions included in this code module: LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);   int WINAPI WinMain(HINSTANCE hInstance,                    HINSTANCE hPrevInstance,                    LPSTR lpCmdLine,                    int nCmdShow) {     WNDCLASSEX wcex;       wcex.cbSize = sizeof(WNDCLASSEX);     wcex.style          = CS_HREDRAW | CS_VREDRAW;     wcex.lpfnWndProc    = WndProc;     wcex.cbClsExtra     = 0;     wcex.cbWndExtra     = 0;     wcex.hInstance      = hInstance;     wcex.hIcon          = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_APPLICATION));     wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);     wcex.hbrBackground  = (HBRUSH)(COLOR_WINDOW+1);     wcex.lpszMenuName   = NULL;     wcex.lpszClassName  = szWindowClass;     wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_APPLICATION));       if (!RegisterClassEx(&wcex))     {         MessageBox(NULL,             _T("Call to RegisterClassEx failed!"),             _T("Win32 Guided Tour"),             NULL);           return 1;     }       hInst = hInstance; // Store instance handle in our global variable       // The parameters to CreateWindow explained:     // szWindowClass: the name of the application     // szTitle: the text that appears in the title bar     // WS_OVERLAPPEDWINDOW: the type of window to create     // CW_USEDEFAULT, CW_USEDEFAULT: initial position (x, y)     // 500, 100: initial size (width, length)     // NULL: the parent of this window     // NULL: this application does not have a menu bar     // hInstance: the first parameter from WinMain     // NULL: not used in this application     HWND hWnd = CreateWindow(         szWindowClass,         szTitle,         WS_OVERLAPPEDWINDOW,         CW_USEDEFAULT, CW_USEDEFAULT,         500, 100,         NULL,         NULL,         hInstance,         NULL     );       if (!hWnd)     {         MessageBox(NULL,             _T("Call to CreateWindow failed!"),             _T("Win32 Guided Tour"),             NULL);           return 1;     }       // The parameters to ShowWindow explained:     // hWnd: the value returned from CreateWindow     // nCmdShow: the fourth parameter from WinMain     ShowWindow(hWnd,         nCmdShow);     UpdateWindow(hWnd);       // Main message loop:     MSG msg;     while (GetMessage(&msg, NULL, 0, 0))     {         TranslateMessage(&msg);         DispatchMessage(&msg);     }       return (int) msg.wParam; }   // //  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM) // //  PURPOSE:  Processes messages for the main window. // //  WM_PAINT    - Paint the main window //  WM_DESTROY  - post a quit message and return // // LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {     PAINTSTRUCT ps;     HDC hdc;     TCHAR greeting[] = _T("MCI コマンド");    //MCI関係  static MCI_OPEN_PARMS mop;  static MCI_SEEK_PARMS msp;  static DWORD ms=0;    int iErr;  TCHAR strErr[1024];    switch (message)  {  case WM_CREATE:   mop.dwCallback = (DWORD)hWnd;   mop.lpstrDeviceType = (LPCSTR)MCI_DEVTYPE_WAVEFORM_AUDIO;   mop.lpstrElementName = "G:\\sampleMovie\\sample.wav";   iErr = mciSendCommand(0,    MCI_OPEN,    MCI_OPEN_TYPE|MCI_OPEN_TYPE_ID | MCI_OPEN_ELEMENT    , (DWORD)&mop);   if (iErr) {    mciGetErrorString(iErr , strErr , 1024);    MessageBox(hWnd , strErr , NULL , MB_OK);   }     //前進   msp.dwCallback=(DWORD)hWnd;   msp.dwTo=(ms+=10000);    //ミリ秒単位   iErr=mciSendCommand(mop.wDeviceID,    MCI_SEEK,MCI_NOTIFY | MCI_TO,    (DWORD)&msp);   if(iErr){    mciGetErrorString(iErr,strErr,1024);    MessageBox(hWnd,strErr,"前進",MB_OK);   }     mciSendCommand(mop.wDeviceID , MCI_PLAY , 0 , 0);     break;  case MM_MCINOTIFY:       break;  case WM_PAINT:   hdc = BeginPaint(hWnd, &ps);           // Here your application is laid out.         // For this introduction, we just print out "Hello, World!"         // in the top left corner.         TextOut(hdc,             5, 5,             greeting, _tcslen(greeting));         // End application-specific layout section.           EndPaint(hWnd, &ps);         break;     case WM_DESTROY:         PostQuitMessage(0);         break;     default:         return DefWindowProc(hWnd, message, wParam, lParam);         break;     }       return 0; }