IE9页面窗口子类化后的重绘问题

Question

大致过程是：
获取显示网页的窗口，类名为:Internet Explorer_Server
然后窗口子类化截取WM_PAINT消息，选调用CallWindowProc让IE先画，然后我再在IE画好的基础上画一些额外的东西

大致代码：C/C++ code

LRESULT CALLBACK NewWndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
  LRESULT lRes = CallWindowProc(g_fnOld, hwnd, uMsg, wParam, lParam);
  if ( uMsg == WM_PAINT )
  {
    hdc = GetDC(hWnd);
    // 在此画我自己额外的东西
    ReleaseDC(hWnd, hdc);
    return 0;
  }
}

这样写在IE6/7/8都没有问题，但是在IE9中感觉我一画上去就被擦除了。不知道为什么？
按道理，只要涉及到绘制界面的操作都会走这个消息，然后我始终都可以画的上呀。
不明白。

Answer 1

IE9换了Direct3D，

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Answer 2

那请问在IE9上我如何实现上述的功能，还请指点，谢谢

Answer 3

要标注的话，自己加ＨＴＭＬ或者用IHighlightRenderingServices 

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Answer 4

你好，我现在是想在HTML页上任意画些图且不影响原来的DOM结构，

我查了一下IHighlightRenderingServices，这个接口好像只是针对文本操作的

加HTML话会对原来的DOM结构产生影响。我还是想通过类似于截取WM_PAINT的方式直接在窗口上画图

请问可以办到吗？

Answer 5

不行，IE9没有用GDI，所以不会有WM_PAINT。

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