如何将IDirect3DSurface9或LPD3DXBUFFER作为JPG保存到内存中

Question

我想捕捉游戏截图，我有代码：

LPDIRECT3DDEVICE9 Device;
D3DSURFACE_DESC screenDescription;

...

void Capture(){
    IDirect3DSurface9* pRenderTarget;
    IDirect3DSurface9* pDestTarget;

    Device->GetRenderTarget(0, &pRenderTarget);
    pRenderTarget->GetDesc(&screenDescription);

    Device->CreateOffscreenPlainSurface(screenDescription.Width, screenDescription.Height, screenDescription.Format, D3DPOOL_SYSTEMMEM, &pDestTarget, NULL);
    Device->GetBackBuffer(0, 0, D3DBACKBUFFER_TYPE_FORCE_DWORD, &pDestTarget);

    char tName[200];
    sprintf(tName, "%s_%d.jpg", "C:\\test", GetTickCount());
    D3DXSaveSurfaceToFileA(tName, D3DXIFF_JPG, pDestTarget, NULL, NULL);

    //LPD3DXBUFFER buffer;
    //D3DXSaveSurfaceToFileInMemory(&buffer, D3DXIFF_JPG, pDestTarget, NULL, NULL);

    pRenderTarget->Release();
    pDestTarget->Release();

    isCapturing = false;
}

用D3DXSaveSurfaceToFileA保存到文件可以很好，但是我想保存捕获的图像并将它们写到磁盘上的另一个文件的末尾，而不是创建新的一次。有没有办法将IDirect3DSurface9或LPD3DXBUFFER转换为JPG字节？

Answer 1

好的，我找到了这段代码，他工作：

LPD3DXBUFFER buffer;
D3DXSaveSurfaceToFileInMemory(&buffer, D3DXIFF_JPG, pDestTarget, NULL, NULL);
DWORD imSize = buffer->GetBufferSize();
void* imgBuffer = buffer->GetBufferPointer();

std::fstream out;
out.open(tName, std::ios_base::binary | std::ios_base::out);
out.write((char*)imgBuffer, imSize);
out.clear();
out.close();