How to save IDirect3DSurface9 or LPD3DXBUFFER to memory as JPG - c++

Question

I'm trying to capture game screenshot, i have that code:
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;
}
Saving to file with D3DXSaveSurfaceToFileA works perfectly, but i want to save captured image and write them to end of another file on disk, not creating a new once.
Is there a way how convert IDirect3DSurface9 or LPD3DXBUFFER to JPG bytes?

Answer 1

Ok, i'm found this code and he works:
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();