win32用GDI+加载png图片作为背景图

  1. #include <windows.h>
  2. #include <gdiplus.h>
  3. /* GDI+ startup token */
  4. ULONG_PTR gdiplusStartupToken;
  5. /* Declare Windows procedure */
  6. LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
  7. // UpdateLayeredWindow Defination
  8. typedef BOOL(*UPDATELAYEREDWINDOWFUNCTION)(HWND,HDC,POINT*,SIZE*,HDC,POINT*,COLORREF,BLENDFUNCTION*,DWORD);
  9. /* Make the class name into a global variable */
  10. char szClassName[ ] = "PNGDialog";
  11. int WINAPI WinMain (HINSTANCE hThisInstance,
  12. HINSTANCE hPrevInstance,
  13. LPSTR lpszArgument,
  14. int nCmdShow)
  15. {
  16. /**/
  17. Gdiplus::GdiplusStartupInput gdiInput;
  18. Gdiplus::GdiplusStartup(&gdiplusStartupToken,&gdiInput,NULL);
  19. /**/
  20. HWND hwnd; /* This is the handle for our window */
  21. MSG messages; /* Here messages to the application are saved */
  22. WNDCLASSEX wincl; /* Data structure for the windowclass */
  23. /* The Window structure */
  24. wincl.hInstance = hThisInstance;
  25. wincl.lpszClassName = szClassName;//+-69+
  26. wincl.lpfnWndProc = WindowProcedure; /* This function is called by windows */
  27. wincl.style = CS_DBLCLKS; /* Catch double-clicks */
  28. wincl.cbSize = sizeof (WNDCLASSEX);
  29. /* Use default icon and mouse-pointer */
  30. wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
  31. wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
  32. wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
  33. wincl.lpszMenuName = NULL; /* No menu */
  34. wincl.cbClsExtra = 0; /* No extra bytes after the window class */
  35. wincl.cbWndExtra = 0; /* structure or the window instance */
  36. /* Use Windows's default colour as the background of the window */
  37. wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
  38. /* Register the window class, and if it fails quit the program */
  39. if (!RegisterClassEx (&wincl))
  40. return 0;
  41. /* The class is registered, let's create the program*/
  42. hwnd = CreateWindowEx (
  43. WS_EX_LAYERED|WS_EX_TOPMOST|WS_EX_TOOLWINDOW, /* Extended possibilites for variation */
  44. szClassName, /* Classname */
  45. "PNGDialog Example Application", /* Title Text */
  46. WS_OVERLAPPEDWINDOW, /* default window */
  47. CW_USEDEFAULT, /* Windows decides the position */
  48. CW_USEDEFAULT, /* where the window ends up on the screen */
  49. 500, /* The programs width */
  50. 500, /* and height in pixels */
  51. HWND_DESKTOP, /* The window is a child-window to desktop */
  52. NULL, /* No menu */
  53. hThisInstance, /* Program Instance handler */
  54. NULL /* No Window Creation data */
  55. );
  56. /* Make the window visible on the screen */
  57. ShowWindow (hwnd, nCmdShow);
  58. LONG style = ::GetWindowLong(hwnd,GWL_STYLE);
  59. if(style&WS_CAPTION)
  60. style^=WS_CAPTION;
  61. if(style&WS_THICKFRAME)
  62. style^=WS_THICKFRAME;
  63. if(style&WS_SYSMENU)
  64. style^=WS_SYSMENU;
  65. ::SetWindowLong(hwnd,GWL_STYLE,style);
  66. style = ::GetWindowLong(hwnd,GWL_EXSTYLE);
  67. if(style&WS_EX_APPWINDOW)
  68. style^=WS_EX_APPWINDOW;
  69. ::SetWindowLong(hwnd,GWL_EXSTYLE,style);
  70. /********************************************
  71. * step 1.
  72. * Using Gdiplus to load the image
  73. ********************************************/
  74. RECT wndRect;
  75. ::GetWindowRect(hwnd,&wndRect);
  76. SIZE wndSize = {wndRect.right-wndRect.left,wndRect.bottom-wndRect.top};
  77. HDC hdc = ::GetDC(hwnd);
  78. HDC memDC = ::CreateCompatibleDC(hdc);
  79. HBITMAP memBitmap = ::CreateCompatibleBitmap(hdc,wndSize.cx,wndSize.cy);
  80. ::SelectObject(memDC,memBitmap);
  81. Gdiplus::Image image(L"pic.png");
  82. Gdiplus::Graphics graphics(memDC);
  83. graphics.DrawImage(&image,0,0,wndSize.cx,wndSize.cy);
  84. /********************************************
  85. * step 2.
  86. * Get "UpdateLayeredWindow" function's
  87. * proc address.
  88. ********************************************/
  89. HMODULE hUser32 = ::LoadLibrary("User32.dll");
  90. if(!hUser32)
  91. {
  92. return FALSE;
  93. }
  94. UPDATELAYEREDWINDOWFUNCTION UpdateLayeredWindow = (UPDATELAYEREDWINDOWFUNCTION)::GetProcAddress(hUser32,"UpdateLayeredWindow");
  95. if(!UpdateLayeredWindow)
  96. {
  97. return FALSE;
  98. }
  99. // get screen dc
  100. HDC screenDC = GetDC(NULL);
  101. POINT ptSrc = {0,0};
  102. /*********************************************
  103. * step 3.
  104. * Use UpdateLayeredWindow to Draw the Window
  105. *
  106. *********************************************/
  107. BLENDFUNCTION blendFunction;
  108. blendFunction.AlphaFormat = AC_SRC_ALPHA;
  109. blendFunction.BlendFlags = 0;
  110. blendFunction.BlendOp = AC_SRC_OVER;
  111. blendFunction.SourceConstantAlpha = 255;
  112. UpdateLayeredWindow(hwnd,screenDC,&ptSrc,&wndSize,memDC,&ptSrc,0,&blendFunction,2);
  113. ::DeleteDC(memDC);
  114. ::DeleteObject(memBitmap);
  115. /* Run the message loop. It will run until GetMessage() returns 0 */
  116. while (GetMessage (&messages, NULL, 0, 0))
  117. {
  118. /* Translate virtual-key messages into character messages */
  119. TranslateMessage(&messages);
  120. /* Send message to WindowProcedure */
  121. DispatchMessage(&messages);
  122. }
  123. Gdiplus::GdiplusShutdown(gdiplusStartupToken);
  124. /* The program return-value is 0 - The value that PostQuitMessage() gave */
  125. return messages.wParam;
  126. }
  127. /* This function is called by the Windows function DispatchMessage() */
  128. LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
  129. {
  130. switch (message) /* handle the messages */
  131. {
  132. case WM_DESTROY:
  133. PostQuitMessage (0); /* send a WM_QUIT to the message queue */
  134. break;
  135. case WM_LBUTTONDOWN:
  136. //::SendMessage(hwnd,WM_HIT)
  137. break;
  138. default: /* for messages that we don't deal with */
  139. return DefWindowProc (hwnd, message, wParam, lParam);
  140. }
  141. return 0;
  142. }

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