C#•9mo ago

All Monitor ScreenShot

Even if I have more than one monitor, this code only takes the screenshot of the main monitor, how can I fix this?

public class ScreenCapture
{
    [DllImport("user32.dll")]
    public static extern IntPtr GetDesktopWindow();

    [DllImport("user32.dll")]
    public static extern IntPtr GetWindowDC(IntPtr hWnd);

    [DllImport("user32.dll")]
    public static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDC);

    [DllImport("gdi32.dll")]
    public static extern uint GetPixel(IntPtr hdc, int nXPos, int nYPos);

    public static Bitmap CaptureDesktop()
    {
        return CaptureWindow(GetDesktopWindow());
    }

    public static Bitmap CaptureWindow(IntPtr handle)
    {
        var rect = new User32.Rect();
        User32.GetWindowRect(handle, ref rect);

        int width = rect.right - rect.left;
        int height = rect.bottom - rect.top;

        var bmp = new Bitmap(width, height, PixelFormat.Format32bppArgb);
        Graphics graphics = Graphics.FromImage(bmp);
        graphics.CopyFromScreen(rect.left, rect.top, 0, 0, new Size(width, height), CopyPixelOperation.SourceCopy);

        return bmp;
    }
}

public class ScreenCapture
{
    [DllImport("user32.dll")]
    public static extern IntPtr GetDesktopWindow();

    [DllImport("user32.dll")]
    public static extern IntPtr GetWindowDC(IntPtr hWnd);

    [DllImport("user32.dll")]
    public static extern IntPtr ReleaseDC(IntPtr hWnd, IntPtr hDC);

    [DllImport("gdi32.dll")]
    public static extern uint GetPixel(IntPtr hdc, int nXPos, int nYPos);

    public static Bitmap CaptureDesktop()
    {
        return CaptureWindow(GetDesktopWindow());
    }

    public static Bitmap CaptureWindow(IntPtr handle)
    {
        var rect = new User32.Rect();
        User32.GetWindowRect(handle, ref rect);

        int width = rect.right - rect.left;
        int height = rect.bottom - rect.top;

        var bmp = new Bitmap(width, height, PixelFormat.Format32bppArgb);
        Graphics graphics = Graphics.FromImage(bmp);
        graphics.CopyFromScreen(rect.left, rect.top, 0, 0, new Size(width, height), CopyPixelOperation.SourceCopy);

        return bmp;
    }
}

14 Replies

leowest•9mo ago

GetWindowRect only gives u the size of one monitor

leowest•9mo ago

https://learn.microsoft.com/en-us/dotnet/api/system.windows.forms.systeminformation.virtualscreen?view=windowsdesktop-8.0&viewFallbackFrom=net-8.0

SystemInformation.VirtualScreen Property (System.Windows.Forms)

Gets the bounds of the virtual screen.

xml•9mo ago

Just wondering if I will use Windows Forms or can I run this code in a console application? i dont understand :c

leowest•9mo ago

The code u post above wont run on console if u dont reference Drawing library either but its possible yes

xml•9mo ago

using System.Drawing.Imaging; using System.Drawing; I added it and it works fine but i dont understand System.Windows.Forsm

leowest•9mo ago

how are u adding

using System.Drawing.Imaging;
using System.Drawing;

using System.Drawing.Imaging;
using System.Drawing;

did u manually reference the DLL?

xml•9mo ago

i use nuget also i currently use this code and ss one screen

leowest•9mo ago

can you show me your csproj content

xml•9mo ago

i dont love c# :sadge: <Project Sdk="Microsoft.NET.Sdk"> <PropertyGroup> <OutputType>WinExe</OutputType> <TargetFramework>net6.0</TargetFramework> <ImplicitUsings>enable</ImplicitUsings> <Nullable>enable</Nullable> <UseWindowsForms>true</UseWindowsForms> </PropertyGroup> <ItemGroup> <PackageReference Include="Newtonsoft.Json" Version="13.0.3" /> <PackageReference Include="System.Drawing.Common" Version="8.0.1" /> <PackageReference Include="System.ServiceProcess.ServiceController" Version="8.0.0" /> </ItemGroup> </Project> this code currently work but kust one screen

leowest•9mo ago

well normally u dont need to nuget those libraries what u do is u change your csproj to include

<TargetFramework>net6.0-windows</TargetFramework>
<UseWindowsForms>true</UseWindowsForms>

<TargetFramework>net6.0-windows</TargetFramework>
<UseWindowsForms>true</UseWindowsForms>

just like u almsot have it there u just missed the -windows then u should be able to use System.Windows.Forms

xml•9mo ago

alright i will try thx

leowest•9mo ago

if u have trouble using the link I posted above let me know is very simple

xml•9mo ago

oki dokie thx its work thx @leowest

leowest•9mo ago

no worries glad u got it working

Gaming

Programming

All Monitor ScreenShot