Question

我的一个位图（这是一张spritesheet）我遇到了这个奇怪的问题。我的游戏运行完美，但GameStart功能初始化了位图和＆amp; sprite，如果我取消注释这行代码就会中断：

g_pPowerup100Bitmap = new Bitmap(hDC, IDB_POWERUP_100, g_hInstance);

结果是函数在它到达该行代码时退出，但必须调用GamePaint（），因为位图被blit到屏幕上。我知道函数没有正确执行，因为它们不是精灵 - 只是图像（音乐永远不会初始化）。精灵＆amp;音乐初始化在同一功能中的位图初始化之下。

更令人沮丧的是，游戏实际上有效......有时候。然后我可以正确地玩游戏＆amp;看到新的动画精灵。然而，在试图调试这个东西几十次之后，它根本就没有正确构建。

我尝试了什么：

1) Try/catch of entire GameStart() contents. Exception is not thrown
2) Extensive breakpoint checking - it's definitely this line
3) Spell-checking variable name - exact same as in header file
4) Re-saving bitmap as 24-bit RGB instead of 32-bit
5) Cleaning & rebuilding both the solution & project file
6) Restarting Visual C++ 2008

位图是64x1536。那是问题吗？我有8GB的RAM和GTX 570分类。这是整个功能：

void GameStart(HWND hWindow)
{
    try
  {
    // Initialize global variables
    g_iInputDelay = 0;
    g_iNumLives = 3;
    g_iScore = 0;
    g_iGameState = 1;
    g_iDifficulty = 1;

    // Seed the random number generator
    srand(GetTickCount());

    // Create the offscreen device context and bitmap
    g_hOffscreenDC = CreateCompatibleDC(GetDC(hWindow));
    g_hOffscreenBitmap = CreateCompatibleBitmap(GetDC(hWindow),
    g_pGame->GetWidth(), g_pGame->GetHeight());
    SelectObject(g_hOffscreenDC, g_hOffscreenBitmap);

    // Create and load the bitmaps
    HDC hDC = GetDC(hWindow);
    g_pHighwayBitmap = new Bitmap(hDC, IDB_HIGHWAY, g_hInstance);
    g_pChickenBitmap = new Bitmap(hDC, IDB_CHICKEN, g_hInstance);
    g_pCarBitmaps[0] = new Bitmap(hDC, IDB_CAR1, g_hInstance);
    g_pCarBitmaps[1] = new Bitmap(hDC, IDB_CAR2, g_hInstance);
    g_pCarBitmaps[2] = new Bitmap(hDC, IDB_CAR3, g_hInstance);
    g_pCarBitmaps[3] = new Bitmap(hDC, IDB_CAR4, g_hInstance);
    g_pChickenHeadBitmap = new Bitmap(hDC, IDB_CHICKENHEAD, g_hInstance);
    g_pMainMenuBitmap = new Bitmap(hDC, IDB_MAIN_MENU, g_hInstance);
    g_pHighScoresMenuBitmap = new Bitmap(hDC, IDB_HIGH_SCORES_MENU, g_hInstance);
    g_pGameOverMenuBitmap =  new Bitmap(hDC, IDB_GAME_OVER_MENU, g_hInstance);
    g_pNormalModeBtnBitmap = new Bitmap(hDC, IDB_NORMAL_MODE_BTN, g_hInstance);
    g_pHardModeBtnBitmap = new Bitmap(hDC, IDB_HARD_MODE_BTN, g_hInstance);
    g_pHighScoresBtnBitmap = new Bitmap(hDC, IDB_HIGH_SCORES_BTN, g_hInstance);
    g_pReplayBtnBitmap = new Bitmap(hDC, IDB_REPLAY_BTN, g_hInstance);
    g_pMainMenuBtnBitmap = new Bitmap(hDC, IDB_MAIN_MENU_BTN, g_hInstance);
    g_pPowerup100Bitmap = new Bitmap(hDC, IDB_POWERUP_100, g_hInstance);

    RECT    rcBounds = { 0, 0, 465, 400 };

    //Button Sprites - Main Menu
    Sprite* pBtnSprite = new Sprite(g_pNormalModeBtnBitmap, 77,228, 0,0, 1, rcBounds, BA_STOP);
    pBtnSprite->SetStateChange(0);
    g_pGame->AddSprite(pBtnSprite, 1);

    pBtnSprite = new Sprite(g_pHardModeBtnBitmap, 254,228, 0,0, 1, rcBounds, BA_STOP);
    pBtnSprite->SetStateChange(0);
    g_pGame->AddSprite(pBtnSprite, 1);

    pBtnSprite = new Sprite(g_pHighScoresBtnBitmap, 166,310, 0,0, 1, rcBounds, BA_STOP);
    pBtnSprite->SetStateChange(3);
    g_pGame->AddSprite(pBtnSprite, 1);


    //Button Sprites - Game Over Menu
    pBtnSprite = new Sprite(g_pReplayBtnBitmap, 167,249, 0,0, 1, rcBounds, BA_STOP);
    pBtnSprite->SetStateChange(0);
    g_pGame->AddSprite(pBtnSprite, 2);

    pBtnSprite = new Sprite(g_pMainMenuBtnBitmap, 82,332, 0,0, 1, rcBounds, BA_STOP);
    pBtnSprite->SetStateChange(1);
    g_pGame->AddSprite(pBtnSprite, 2);

    pBtnSprite = new Sprite(g_pHighScoresBtnBitmap, 252,332, 0,0, 1, rcBounds, BA_STOP);
    pBtnSprite->SetStateChange(3);
    g_pGame->AddSprite(pBtnSprite, 2);

    //Button Sprites - High Scores Menu
    pBtnSprite = new Sprite(g_pMainMenuBtnBitmap, 166,332, 0,0, 1, rcBounds, BA_STOP);
    pBtnSprite->SetStateChange(1);
    g_pGame->AddSprite(pBtnSprite, 3);

        // Create the chicken and car sprites
    g_pChickenSprite = new Sprite(g_pChickenBitmap, rcBounds, BA_STOP);
    g_pChickenSprite->SetPosition(4, 175);
    g_pChickenSprite->SetVelocity(0, 0);
    g_pChickenSprite->SetZOrder(1);
    g_pChickenSprite->SetNumFrames(2);
    g_pChickenSprite->SetAsInputControlled(); //stops auto-frame update
    //DEBUGGING ONLY!!!!!
    g_pChickenSprite->SetID(1);
    g_pGame->AddSprite(g_pChickenSprite, 0);

    Sprite* pSprite = new Sprite(g_pCarBitmaps[0], rcBounds, BA_WRAP);
    pSprite->SetPosition(70, 0);
    pSprite->SetVelocity(0, 6);
    pSprite->SetZOrder(2);
    g_pGame->AddSprite(pSprite, 0);
    pSprite = new Sprite(g_pCarBitmaps[1], rcBounds, BA_WRAP);
    pSprite->SetPosition(160, 0);
    pSprite->SetVelocity(0, 2);
    pSprite->SetZOrder(2);
    g_pGame->AddSprite(pSprite, 0);
    pSprite = new Sprite(g_pCarBitmaps[2], rcBounds, BA_WRAP);
    pSprite->SetPosition(239, 400);
    pSprite->SetVelocity(0, -4);
    pSprite->SetZOrder(2);
    g_pGame->AddSprite(pSprite, 0);
    pSprite = new Sprite(g_pCarBitmaps[3], rcBounds, BA_WRAP);
    pSprite->SetPosition(329, 400);
    pSprite->SetVelocity(0, -9);
    pSprite->SetZOrder(2);
    g_pGame->AddSprite(pSprite, 0);

    // Load the background music
    g_pGame->PlayMIDISong(TEXT("Music.mid"));

    getHighScores(scoreData, g_scoreTop);

    scoreData.close();

  }
  catch (int e)
  {
    cout << "An exception occurred. Exception Nr. " << e << endl;
    system("PAUSE");
  }
}

在此上下文中调用GameStart（）：

switch (msg)
  {
    case WM_CREATE:
      // Set the game window and start the game
      SetWindow(hWindow);
      GameStart(hWindow);
      return 0;

如果有人能够解释为什么该位图会破坏该功能，我将非常感激！

编辑：Hans正好问题 - 我勾选了“Win32 Exceptions”复选框＆amp;这行代码出现了内存访问错误：

    CopyMemory(pBitmapBits, pTempBits, pBitmapInfo->bmiHeader.biSizeImage);

图像太大了吗？我会继续调查，但欢迎任何建议。

Answer 1

请勿使用WM_CREATE消息初始化游戏。当您在64位操作系统上运行32位代码时会出现一个非常具体的问题，这可能导致在消息处理代码中引发SEH异常（如访问冲突）时被吞下。 WM_CREATE是显示问题的消息之一。有关this answer中此行为的大量详细信息，尽管它对Winforms非常具体。但是，当您使用C或C ++编写代码时，会出现完全相同的问题。

没有（通常）需要使用WM_CREATE来初始化东西，你也可以在CreateWindowsEx（）调用之后移动它，因为你应该只需要窗口句柄。调试器现在将再次有用，并向您显示代码崩溃的位置。

如果你确实在WM_CREATE中需要它，那么使用Debug + Exceptions调试它，勾选Win32异常的Thrown复选框。此外，验证此答案是否准确的方法。

Answer 2

就像我现在一样，在致电GetDC之后，您必须致电ReleaseDC。但是你进行了三次GetDC调用。留下一个电话，存储HDC，最后释放它。

Win32：位图实例化中断函数

2 个答案: