Can't save files on the desktop

Question

Hi,

Recently I have been struggling with an issue in my Windows Forms application, written in C#. In brief, the program generates an HTML document and a few images (png) that need to be saved as a folder chosen by the user via the FolderBrowserDialog.

Whenever I try to save my folder on the Desktop, My Documents or any other location on disk C:, I observe the following exception:

System.Runtime.InteropServices.ExternalException: 'A generic error occurred in GDI+.'. I have tried a workaround , copying byte array from memory stream to file stream, but then the error is : System.UnauthorizedAccessException: Access to the path 'C:\Users\DidoPc\Desktop\djdfjdfjdfj folder from February 07, 2021\QRUSR.Png' is denied.
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath).

Even when manually adding full permissions to the directory where I want to save the files, I still don't have any access from the point of view of the program.

I have no problem saving to drive D:, but that's not the point... The excepted behaviour for drive C: should be the same as well.

I will be grateful if anyone can help with some suggestions.

Best,
Deyan

FolderBrowserDialog folderBrowserDialog = new FolderBrowserDialog();

                if (folderBrowserDialog.ShowDialog() == DialogResult.OK)
            {

                PathToExportedHtml.Text = folderBrowserDialog.SelectedPath;

                string folderPath = folderBrowserDialog.SelectedPath;

  string location = folderPath + $"\\{usernameTextBox.Text}   folder from {DateTime.Now.ToString("MMMM dd, yyyy")}";
                Debug.WriteLine("Selected path is: " + folderPath);
                Debug.WriteLine("Location after concatenation is: " + location);

                DirectoryInfo dInfo = Directory.CreateDirectory(location);
                DirectorySecurity dSecurity = dInfo.GetAccessControl();

dSecurity.AddAccessRule(new FileSystemAccessRule(new         SecurityIdentifier(WellKnownSidType.WorldSid, null), FileSystemRights.FullControl, InheritanceFlags.ObjectInherit | InheritanceFlags.ContainerInherit, PropagationFlags.InheritOnly, AccessControlType.Allow));
                Directory.SetAccessControl(location, dSecurity);
                dInfo.SetAccessControl(dSecurity);


                Common.pathToCreatedReport = location + $"\\{usernameTextBox.Text}_Report({DateTime.Now.ToString("MMMM dd, yyyy")}).html";

                try
                {
                       if (Username_Pass_QR != null)
                    {
                        thereIsUsrNameQr = true;
                        var usernamePassImage = accountCredQrCode.Image;

                        var usernamePassImageBitmap = new Bitmap(usernamePassImage);

                        byte[] usernamePassImageBitmapAsByteArray = 

Miscalleneous.Instance.ImageToByteArray(usernamePassImageBitmap);

                        MemoryStream usernamePassImageAsMemStream = new MemoryStream(usernamePassImageBitmapAsByteArray, true);


                            using (FileStream file = new FileStream(Path.Combine(location, "QRUSR.Png"), FileMode.Create, System.IO.FileAccess.Write))
                                usernamePassImageAsMemStream.CopyTo(file);


                        }
                    if (SSID_PSK_QR != null)
                    {
                        thereIsSSIDQr = true;
                        var ssidImg = wifiCredQrCode.Image;  

                        var ssidImageBitmap = new Bitmap(ssidImg);

                        ssidImageBitmap.Save(location + "\\QRSSID.Png", ImageFormat.Png);
                    }


                    ReportComponents components = new ReportComponents(SSID, PSK, HiddenWpa, Username, Password, thereIsUsrNameQr, thereIsSSIDQr);
                    Report report = new Report();

                    report.Generate(components);


                    Bitmap logoImg = new Bitmap(Properties.Resources.GroupLogo___Adaptive_Icon);
                    Bitmap emptyQr = new Bitmap(Properties.Resources.EmptyQr);
                    emptyQr.Save(location + "\\EmptyQr.jpg", ImageFormat.Png);
                    logoImg.Save(location + "\\GroupLogo - Adaptive Icon.png", ImageFormat.Png);


                    MessageBox.Show("Export of report complete successfully!");

Answer 1

You need to use the filesavedialog to be to get permission to save to a desktop

Answer 2

Hi 49159189,
First, please make sure that the saved folder has read/write permissions.
Then try the following code:

using (var ms = new MemoryStream(‘yourImageByte’)) {  
    patternImage = new Bitmap(ms);  
    patternImage.Save("filePath", ImageFormat.Jpeg);  
}  

Best Regards,
Daniel Zhang

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Answer 3

Try adding a manifest file

1. Right click on the project in Solution Explorer
2. Add new item
3. Search for manifest
4. Once added replace the contents with the following.

Does that help or not ?

<?xml version="1.0" encoding="utf-8"?>
<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
  <assemblyIdentity version="1.0.0.0" name="MyApplication.app"/>
  <trustInfo xmlns="urn:schemas-microsoft-com:asm.v2">
    <security>
      <requestedPrivileges xmlns="urn:schemas-microsoft-com:asm.v3">
        <requestedExecutionLevel  level="requireAdministrator" uiAccess="false" />
      </requestedPrivileges>
    </security>
  </trustInfo>

  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
    <application>

    </application>
  </compatibility>
</assembly>