setwindowLong函数

设置窗口或者控件的透明度 

例子参考：

LRESULT CALLBACK DialogProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)

{

       

       hwndPro = hWnd;

       static HBRUSH OrgBrush, hBrush;

       WCHAR msg[] = L"    ";

       PAINTSTRUCT ps;

       HANDLE   hfStart;

       switch (message)

       {

       case WM_COMMAND:

       {

              if (LOWORD(wParam) == IDC_UP1)                                                                                //按钮1

              {

                     HANDLE HTJtoK = CreateThread(NULL, 0, ThreadFunJtoK, NULL, 0, 0);

              }

              else if (LOWORD(wParam) == IDC_UP2)                                                                           //按钮2

              {

                     HANDLE HTKtoJ = CreateThread(NULL, 0, ThreadFunKtoJ, NULL, 0, 0);

              }

       }

       break;

       case WM_INITDIALOG:

       {

              SetWindowLong(hWnd, GWL_EXSTYLE, GetWindowLong(hWnd, GWL_EXSTYLE) | WS_EX_LAYERED);

              // 设置透明度 0 - completely transparent   255 - opaque 

              SetLayeredWindowAttributes(hWnd, 0,70, LWA_ALPHA);          //透明度70