117.C语言实现桌面输出图片,桌面输出文字,桌面画线

通过获取窗口句柄,然后获取窗口DC,然后画图

#include <Windows.h>
#include <stdio.h>

//桌面画线
void drawLine()
{
    //获取控制台窗口
    //HWND hwnd = GetConsoleWindow();
    //获取输出
    //HDC hdc = GetDC(hwnd);
    //获取桌面窗口
    HWND hwnd = GetDesktopWindow();
    //获取输出
    HDC hdc = GetWindowDC(hwnd);
    HPEN hpen = CreatePen(PS_SOLID, 2, RGB(255, 255, 255));
    SelectObject(hdc, hpen);//选中笔
    while (1)
    {
        LineTo(hdc, 10, 10);
        Sleep(20);
        LineTo(hdc, 100, 100);
        Sleep(20);
        LineTo(hdc, 100, 300);
        Sleep(20);
        LineTo(hdc, 600, 300);
        Sleep(20);
        LineTo(hdc, 900, 300);
        Sleep(20);
        LineTo(hdc, 900, 900);
    }
    

    system("pause");
}

//桌面或者控制台显示图片
void drawPic()
{
    //获取控制台窗口
    //HWND hwnd = GetConsoleWindow();
    //获取输出
    //HDC hdc = GetDC(hwnd);
    //获取桌面窗口
    HWND hwnd = GetDesktopWindow();
    //获取输出
    HDC hdc = GetWindowDC(hwnd);
    HBRUSH brush = CreateSolidBrush(RGB(255, 0, 0));
    SelectObject(hdc, brush);//选中笔
    while (1)
    {
        Rectangle(hdc, 50, 50, 400, 400);
        Sleep(20);
    }
    system("pause");

}

//桌面输出文字
void drawText()
{
    HWND hwnd = GetDesktopWindow();
    HDC hdc = GetWindowDC(hwnd);
    SetTextColor(hdc, RGB(0, 0, 255));
    //设置背景
    SetBkColor(hdc, RGB(255, 0, 0));

    while (1)
    {
        HFONT hfont, hfontold;
        hfont = CreateFontA(
            180,
            140,
            0,
            0,
            FW_REGULAR,
            FALSE,
            FALSE,
            FALSE,
            GB2312_CHARSET,
            OUT_DEFAULT_PRECIS,
            CLIP_DEFAULT_PRECIS,
            PROOF_QUALITY,
            FIXED_PITCH | FF_MODERN,
            "隶书"
        );
        
        //选择字体
        hfontold = SelectObject(hdc, hfont);
        //在区域输出文字
        /*RECT rctext;
        rctext.left = 10;
        rctext.top = 10;
        rctext.right = 800;
        rctext.bottom = 800;
        DrawTextA(hdc, "桌面文字输出测试", strlen("桌面文字输出测试"), &rctext, DT_CENTER);*/
        TextOutA(hdc, 0, 0, "桌面文字输出测试", strlen("桌面文字输出测试"));
        SelectObject(hdc, hfontold);
        Sleep(100);
    }
}

void main()
{
    //drawPic();
    //drawLine();
    drawText();
    system("pause");
}

• 桌面绘图

  #include <stdio.h>
  #include <stdlib.h>
  #include <windows.h>
  
  void main()
  {
      HWND hwnd = GetConsoleWindow();
      HDC hdc = GetDC(hwnd);
      //创建兼容DC
      HDC memdc = CreateCompatibleDC(0);
      //载入位图
      HBITMAP bit = LoadImageA(hwnd, "C:\Users\Administrator\Desktop\1.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE | LR_CREATEDIBSECTION);
      //位图有兼容DC绑定
      SelectObject(memdc, bit);
      //兼容DC与hdc绑定
      BitBlt(hdc, 0, 0, 300, 300, memdc, 0, 0, SRCCOPY);
  
      system("pause");
  }