学步园

		Device->BeginScene();  

		// assume _surface is a pointer to an idirect3dsurface9 interface.
		// assumes a 32-bit pixel format for each pixel.
		// get the surface description.描述表面

		D3DSURFACE_DESC surfacedesc;
		Device->GetBackBuffer(0,0,D3DBACKBUFFER_TYPE_MONO,&_surface);
		_surface->GetDesc(&surfacedesc);//注意已经假定了_surface是指向idirect3dsurface9借//口的指针

		// get a pointer to the surface pixel data.取得指向该内存区的指针
		D3DLOCKED_RECT lockedrect;

		_surface->LockRect(

					  &lockedrect,// pointer to receive locked data指向申请到的内存区域

					  0, // lock entire surface

					  0); // no lock flags specified 

		// iterate through each pixel in the surface and set it to red.设置指定的表面为红色

		DWORD * imagedata = (DWORD *)lockedrect.pBits;

		for(int i = 0; i < surfacedesc.Height; i++)
		{
			for(int j = 0; j < surfacedesc.Width; j++)
			{
				// index into texture, note we use the pitch and divide by
				// four since the pitch is given in bytes and there are
				// 4 bytes per dword.

				int index = i * lockedrect.Pitch / 4 + j;
				imagedata[index] = 0xffff0000; // red
			}
		}

		_surface->UnlockRect();
	   Device->EndScene(); 

    d3dpp.Flags                      = D3DPRESENTFLAG_LOCKABLE_BACKBUFFER;  // d3dpp是D3DPRESENT_PARAMETERS 结构体变量  这一条非常关键哦

以上是主要代码。采用directx 9.0实现的。当时探索了很久，费了好久的功夫啊。。

在此感谢这两位朋友的博客

IDirect3DSurface9::LockRect失败的问题  

Directx IDirect3DSurface9:LockRect调用返回一个绝对值很大负数

欢迎交流。