通過獲取窗口句柄,然後獲取窗口DC,然後畫圖

  1 #include <Windows.h>
  2 #include <stdio.h>
  3 
  4 //桌面畫線
  5 void drawLine()
  6 {
  7     //獲取控制臺窗口
  8     //HWND hwnd = GetConsoleWindow();
  9     //獲取輸出
 10     //HDC hdc = GetDC(hwnd);
 11     //獲取桌面窗口
 12     HWND hwnd = GetDesktopWindow();
 13     //獲取輸出
 14     HDC hdc = GetWindowDC(hwnd);
 
 15     HPEN hpen = CreatePen(PS_SOLID, 2, RGB(255, 255, 255));
 16     SelectObject(hdc, hpen);//選中筆
 17     while (1)
 18     {
 19         LineTo(hdc, 10, 10);
 20         Sleep(20);
 21         LineTo(hdc, 100, 100);
 22         Sleep(20);
 23         LineTo(hdc, 100, 300);
 24         Sleep(20);
 25         LineTo(hdc, 600
 
, 300);
 26         Sleep(20);
 27         LineTo(hdc, 900, 300);
 28         Sleep(20);
 29         LineTo(hdc, 900, 900);
 30     }
 31     
 32 
 33     system("pause");
 34 }
 35 
 36 //桌面或者控制臺顯示圖片
 37 void drawPic()
 38 {
 39     //獲取控制臺窗口
 40     //HWND hwnd = GetConsoleWindow();
 41     //獲取輸出
 42     //HDC hdc = GetDC(hwnd);
 
 43     //獲取桌面窗口
 44     HWND hwnd = GetDesktopWindow();
 45     //獲取輸出
 46     HDC hdc = GetWindowDC(hwnd);
 47     HBRUSH brush = CreateSolidBrush(RGB(255, 0, 0));
 48     SelectObject(hdc, brush);//選中筆
 49     while (1)
 50     {
 51         Rectangle(hdc, 50, 50, 400, 400);
 52         Sleep(20);
 53     }
 54     system("pause");
 55 
 56 }
 57 
 58 //桌面輸出文字
 59 void drawText()
 60 {
 61     HWND hwnd = GetDesktopWindow();
 62     HDC hdc = GetWindowDC(hwnd);
 63     SetTextColor(hdc, RGB(0, 0, 255));
 64     //設置背景
 65     SetBkColor(hdc, RGB(255, 0, 0));
 66 
 67     while (1)
 68     {
 69         HFONT hfont, hfontold;
 70         hfont = CreateFontA(
 71             180,
 72             140,
 73             0,
 74             0,
 75             FW_REGULAR,
 76             FALSE,
 77             FALSE,
 78             FALSE,
 79             GB2312_CHARSET,
 80             OUT_DEFAULT_PRECIS,
 81             CLIP_DEFAULT_PRECIS,
 82             PROOF_QUALITY,
 83             FIXED_PITCH | FF_MODERN,
 84             "隸書"
 85         );
 86         
 87         //選擇字體
 88         hfontold = SelectObject(hdc, hfont);
 89         //在區域輸出文字
 90         /*RECT rctext;
 91         rctext.left = 10;
 92         rctext.top = 10;
 93         rctext.right = 800;
 94         rctext.bottom = 800;
 95         DrawTextA(hdc, "桌面文字輸出測試", strlen("桌面文字輸出測試"), &rctext, DT_CENTER);*/
 96         TextOutA(hdc, 0, 0, "桌面文字輸出測試", strlen("桌面文字輸出測試"));
 97         SelectObject(hdc, hfontold);
 98         Sleep(100);
 99     }
100 }
101 
102 void main()
103 {
104     //drawPic();
105     //drawLine();
106     drawText();
107     system("pause");
108 }

117.C語言實現桌面輸出圖片,桌面輸出文字,桌面畫線