DirectX 9 C++程序崩溃,不会重新打开

我刚开始学习如何在C++中编写DirectX 9应用程序,所以我仍然不太好,我把它搞得一团糟。

当我在程序崩溃后重新打开程序时,D3D设备无法创建,结果是 D3DERR\ U无效呼叫 . 我正在用MinGW中的G++进行编译,使用的是DirectX 2009年8月的SDK。我猜是因为当它崩溃时我没有释放所有的设备和纹理等,它仍然认为我在使用它们。重新启动时重新打开。有人能给我指出正确的方向,如何排序“重置”DirectX吗?

下面是我用来创建设备的内容:

D3D = Direct3DCreate9(D3D_SDK_VERSION);

D3DPRESENT_PARAMETERS D3DPP;
ZeroMemory(&D3DPP, sizeof(D3DPP));
D3DPP.Windowed = TRUE;
D3DPP.SwapEffect = D3DSWAPEFFECT_DISCARD;
D3DPP.hDeviceWindow = hWnd;
D3DPP.BackBufferFormat = D3DFMT_X8R8G8B8;
D3DPP.BackBufferWidth = WIDTH;
D3DPP.BackBufferHeight = HEIGHT;
D3DDevice = 0; //Null pointer to make sure I can check it
HRESULT hr = D3D->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL,
hWnd, D3DCREATE_SOFTWARE_VERTEXPROCESSING, &D3DPP, &D3DDevice);

if (!D3DDevice) {
    MessageBox(NULL,"Device could not be created","error",0);
    switch (hr) {
    case D3DERR_DEVICELOST: 
    MessageBox(NULL,"1","error",0);
    break;
    case D3DERR_INVALIDCALL: 
    MessageBox(NULL,"2","error",0);
    break;
    case D3DERR_NOTAVAILABLE: 
    MessageBox(NULL,"3","error",0);
    break;
    case D3DERR_OUTOFVIDEOMEMORY:
    MessageBox(NULL,"4","error",0);
    break;
    };
    return 1;
};
return 0;