C# Screen Capture - 스크린 캡쳐

C#으로 스크린을 캡쳐 해 보자.

 

폼과 버튼을 적당히 배치한다.

 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
 
using System.Runtime.InteropServices;
 
namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();            
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            Bitmap bm = ScreenCapture.Capture();
 
            Graphics g = CreateGraphics();
            g.DrawImage(bm, 10, 40, new Rectangle(100, 100, 450, 250), GraphicsUnit.Pixel);
            g.Dispose();
        }
    }
 
    public class ScreenCapture
    {
        [DllImport("user32.dll", ExactSpelling = true, SetLastError = true)]
        private static extern IntPtr GetDC(IntPtr hWnd);
 
        [DllImport("user32.dll", ExactSpelling = true)]
        private static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDC);
 
        [DllImport("gdi32.dll", ExactSpelling = true)]
        private static extern IntPtr BitBlt(IntPtr hDestDC, int x, int y, int nWidth, int nHeight, IntPtr hSrcDC, int xSrc, int ySrc, int dwRop);
 
        [DllImport("user32.dll", EntryPoint = "GetDesktopWindow")]
        private static extern IntPtr GetDesktopWindow();
 
        public static Bitmap Capture()
        {
            int screenWidth = Screen.PrimaryScreen.Bounds.Width;
            int screenHeight = Screen.PrimaryScreen.Bounds.Height;
 
            Bitmap screenBmp = new Bitmap(screenWidth, screenHeight);
            Graphics g = Graphics.FromImage(screenBmp);
 
            IntPtr desktopDC = GetDC(GetDesktopWindow());
            IntPtr hDC = g.GetHdc();
 
            BitBlt(hDC, 0, 0, screenWidth, screenHeight, desktopDC, 0, 0, 0x00CC0020);    //SRCCOPY (DWORD)0x00CC0020
 
            ReleaseDC(GetDesktopWindow(), desktopDC);
            g.ReleaseHdc(hDC);
            g.Dispose();
 
            return screenBmp;
        }
    }
}

 

소스를 입력하고 빌드한다.

 

실행하면 버튼만 하나 나타난다. 클릭하자.

 

지정한 위치의 화면이 캡쳐되어 표시된다.