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POTaking screenshot with Win32 API (C# pInvoke) not working in IIS
 

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  1. POTaking screenshot with Win32 API (C# pInvoke) not working in IIS
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    <p>I want to take a screenshot of an external website. Currently my workflow is to start a Firefox instance with the specified URL and take a screenshot using PrintWindow in the Win32 API</p> <p>When I run this application in IISExpress it works fine but when I run the same application in IIS on a windows VPS it is not working (screenshot is blank).</p> <p>I don't know what I'm doing wrong?</p> <p>My code:</p> <pre><code>using Newtonsoft.Json; using System; using System.Collections.Generic; using System.Diagnostics; using System.Drawing; using System.Drawing.Imaging; using System.Linq; using System.Runtime.InteropServices; using System.Security; using System.Threading; using System.Web; namespace WebTools.Web { public class RemoteScreenshot { public static Bitmap TakeScreenshot(Process process) { // may need a process Refresh before return TakeScreenshot(process.MainWindowHandle); } public static Bitmap TakeScreenshot(IntPtr handle) { RECT rc = new RECT(); GetWindowRect(handle, ref rc); Bitmap bitmap = new Bitmap(rc.right - rc.left, rc.bottom - rc.top); using (Graphics graphics = Graphics.FromImage(bitmap)) { PrintWindow(handle, graphics.GetHdc(), 0); } return bitmap; } [DllImport("user32.dll")] private static extern bool GetWindowRect(IntPtr hWnd, ref RECT rect); [DllImport("user32.dll")] private static extern bool PrintWindow(IntPtr hWnd, IntPtr hDC, int flags); [StructLayout(LayoutKind.Sequential)] private struct RECT { public int left; public int top; public int right; public int bottom; } public static void Save(string url, string file, int timeout = 0) { var proc = Process.Start(new ProcessStartInfo("C:\\Program Files (x86)\\Mozilla Firefox\\firefox.exe", url) { CreateNoWindow = false, WindowStyle = ProcessWindowStyle.Maximized }); Thread.Sleep(timeout); var bitmap = TakeScreenshot(proc); bitmap.Save(file, ImageFormat.Png); bitmap.Dispose(); proc.Kill(); } } } </code></pre> <p>EDIT: Running Firefox works fine because the AppPool is under another account that has the rights to execute firefox. </p>
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    1. UStereško
    1. USDillen Meijboom
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      1. POTaking screenshot with Win32 API (C# pInvoke) not working in IIS
      1. USRahul Patel
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    1. COHow is it not working? Does it throw an exception? Chances are you're hitting a code access boundary and it's throwing an UnauthorizedException
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      1. POTaking screenshot with Win32 API (C# pInvoke) not working in IIS
      1. USSimon Whitehead
    2. CO@SimonWhitehead I run the apppool with a user-identity. I'm eventualy getting a ArgumentException on the Bitmap constructor part because the width and height of the screen can't be calculated but when I set this to 1600x900 it is also not working.
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      1. POTaking screenshot with Win32 API (C# pInvoke) not working in IIS
      1. USDillen Meijboom
    3. COYou'll need to add some logging. Log the values you're passing into the bitmap constructor.
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      1. POTaking screenshot with Win32 API (C# pInvoke) not working in IIS
      1. USSimon Whitehead
 

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