show_thpr_times.cpp_17times cpp-优快云博客

本文提供了一个Windows环境下通过编程方式获取当前线程的选择器入口(LDT_ENTRY)及基地址的示例代码。该代码展示了如何使用GetThreadContext和GetThreadSelectorEntry函数来获取DS段寄存器对应的LDT_ENTRY，这对于理解进程上下文和调试有着重要作用。

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name="google_ads_frame" marginwidth="0" marginheight="0" src="http://pagead2.googlesyndication.com/pagead/ads?client=ca-pub-5572165936844014&dt=1194442938015&lmt=1194190197&format=336x280_as&output=html&correlator=1194442937843&url=file%3A%2F%2F%2FC%3A%2FDocuments%2520and%2520Settings%2Flhh1%2F%E6%A1%8C%E9%9D%A2%2FCLanguage.htm&color_bg=FFFFFF&color_text=000000&color_link=000000&color_url=FFFFFF&color_border=FFFFFF&ad_type=text&ga_vid=583001034.1194442938&ga_sid=1194442938&ga_hid=1942779085&flash=9&u_h=768&u_w=1024&u_ah=740&u_aw=1024&u_cd=32&u_tz=480&u_java=true" frameborder="0" width="336" scrolling="no" height="280" allowtransparency="allowtransparency"> #include <genstub.c>

// Windows message procedure.
LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
   switch (uMsg)
   {
       case WM_COMMAND:       // Process menu items.
               switch ( LOWORD( wParam ) )
               {
                  case IDM_TEST:
                    {
                       TCHAR szBuffer[128];
                       DWORD dwBaseAddr;
                       LDT_ENTRY ldtEntry;
                       CONTEXT context;
                       context.ContextFlags = CONTEXT_FULL;
                       GetThreadContext( GetCurrentThread(), &context );
                       GetThreadSelectorEntry( GetCurrentThread(), context.SegDs,
                                               &ldtEntry );
                       dwBaseAddr = ldtEntry.BaseLow +
                                    (DWORD) ldtEntry.HighWord.Bits.BaseMid << 8 +
                                    (DWORD) ldtEntry.HighWord.Bits.BaseHi << 16;
                       wsprintf( szBuffer,
                                 "LDT entry for %lX. Base = %lX, Type = %X, Priv = %X ",
                                 context.SegDs, dwBaseAddr, ldtEntry.HighWord.Bits.Type,
                                 ldtEntry.HighWord.Bits.Dpl );
                       MessageBox( hWnd, szBuffer, "Thread Selector Entry", MB_OK );
                    }
                  break;
                  case IDM_EXIT:
                       DestroyWindow( hWnd );
                       break;
               }
               break;
       case WM_DESTROY:
               PostQuitMessage( 0 );
               break;
          break;
       default:
            return DefWindowProc( hWnd, uMsg, wParam, lParam );
   }
   return NULL;
}