A generic error occurred in GDI+

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Hi all :)

I have this code, that create a thumbnial from another image, but when I save this image it gives me this error.

"A generic error occurred in GDI+."

Here is my code, all images is .Jpg.

C#

#region create thumnail
                string src = Server.MapPath("~/" + RadComboBox1.SelectedValue.ToString() + "/images/" + validFile.FileName);
                System.Drawing.Image image = System.Drawing.Image.FromFile(src);
                int srcWidth = image.Width;
                int srcHeight = image.Height;
                Bitmap bmp = new Bitmap(110, 74);

                System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(bmp);
                gr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                gr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
                gr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

                System.Drawing.Rectangle rectDestination = new System.Drawing.Rectangle(0, 0, 110, 74);
                gr.DrawImage(image, rectDestination, 0, 0, srcWidth, srcHeight, GraphicsUnit.Pixel);

                bmp.Save(src);

                bmp.Dispose();
                image.Dispose();
                #endregion

Any help please ? :)

Posted 1-Nov-11 4:30am

Msaya

Updated 1-Nov-11 4:32am

RaisKazi

v3

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89kksahu 26-Oct-12 1:26am

==========================================
*******PLEASE HELP ON THIS****************
==========================================

I GOT A ERROR MESSAGE:
A GENERIC ERROR OCCURRED IN GDI+
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Collections;
using Twaingui;

using GdiPlusLib;

namespace Twaingui
{
public partial class Form1 : Form, IMessageFilter
{
public Twain tw;
public bool msgfilter;
private int picnumber = 0;
public Form1()
{

InitializeComponent();
tw = new Twain();
tw.Init(this.Handle);
}
bool IMessageFilter.PreFilterMessage(ref Message m)
{
TwainCommand cmd = tw.PassMessage(ref m);
if (cmd == TwainCommand.Not)
return false;

switch (cmd)
{
case TwainCommand.CloseRequest:
{
EndingScan();
tw.CloseSrc();
break;
}
case TwainCommand.CloseOk:
{
EndingScan();
tw.CloseSrc();
break;
}
case TwainCommand.DeviceEvent:
{
break;
}
case TwainCommand.TransferReady: //ERROR IN THIS BOCK OF CODE
{
ArrayList pics = tw.TransferPictures();
EndingScan();
tw.CloseSrc();
picnumber++;
for (int i = 0; i < pics.Count; i++)
{
IntPtr img = (IntPtr)pics[i];

/*PicForm newpic = new PicForm(img);
newpic.MdiParent = this;
int picnum = i + 1;
newpic.Text = "ScanPass" + picnumber.ToString() + "_Pic" + picnum.ToString();
newpic.Show();
* */
System.Drawing.Bitmap bitmap = System.Drawing.Bitmap.FromHbitmap(img);
//pictureBox1.Image = Image.FromHbitmap(img);

}
break;
}
}

return true;
}

private void EndingScan()
{
if (msgfilter)
{
Application.RemoveMessageFilter(this);
msgfilter = false;
this.Enabled = true;
this.Activate();
}
}
private void SelectScaner_Click(object sender, EventArgs e)
{
tw.Select();
}

private void scan_Click(object sender, EventArgs e)
{
if (!msgfilter)
{
this.Enabled = false;
msgfilter = true;
Application.AddMessageFilter(this);

}
tw.Acquire();
}

private void Form1_FormClosed(object sender, FormClosedEventArgs e)
{
tw.Finish();
}

private void Form1_Load(object sender, EventArgs e)
{

}

private void panel1_Paint(object sender, PaintEventArgs e)
{

}

private void Exit_Click(object sender, EventArgs e)
{
Close();
}
}
}

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OriginalGriff · Answer 1 · 2011-11-01T05:04:00

The problem is that you are trying to save the new image over the top of the existing file: Because you loading the original image from the file, it is in use when you try to overwrite it. If you move the

C#

image.Dispose();

line uup to above the

C#

bmp.Save(src);

line, it will work.

BTW: you should also Dispose the Graphics object you created - they are a scarce resource!

UJimbo · Answer 2 · 2011-11-01T04:57:00

It happens because you're trying to overwrite your original image at runtime. You have to save the thumbnail to a different image.

Try:

string src = Server.MapPath("~/" + RadComboBox1.SelectedValue.ToString() + "/images/" + validFile.FileName);
string thumbPath = Server.MapPath("~/" + RadComboBox1.SelectedValue.ToString() + "/images/" + "thumb" + validFile.FileName);


System.Drawing.Image image = System.Drawing.Image.FromFile(src);
int srcWidth = image.Width;
int srcHeight = image.Height;
Bitmap bmp = new Bitmap(110, 74);
 
System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(bmp);
gr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
gr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
gr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
 
System.Drawing.Rectangle rectDestination = new System.Drawing.Rectangle(0, 0, 110, 74);
gr.DrawImage(image, rectDestination, 0, 0, srcWidth, srcHeight, GraphicsUnit.Pixel);
 

bmp.Save(thumbPath);

gr.Dispose(); 
bmp.Dispose();
image.Dispose();

P.S. Handy Piece of code overall :)

phil.o · Answer 3 · 2011-11-01T09:47:00

Here I would make an indecent use of the using keyword. This way :

#region create thumnail
string src = Server.MapPath("~/" + RadComboBox1.SelectedValue.ToString() + "/images/" + validFile.FileName);

using (System.Drawing.Image image = System.Drawing.Image.FromFile(src))
using (Bitmap bmp = new Bitmap(110, 74))
using (System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(bmp))
{
   int srcWidth = image.Width;
   int srcHeight = image.Height;
   gr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
   gr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
   gr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;

   System.Drawing.Rectangle rectDestination = new System.Drawing.Rectangle(0, 0, 110, 74);
   gr.DrawImage(image, rectDestination, 0, 0, srcWidth, srcHeight, GraphicsUnit.Pixel);
   string dest = <destination file name from your scheme>;
   bmp.Save(dest);
}
#endregion

This way everything that has to be is cleaned up at the end of the process, without having to close/dispose anything ; using will handle that for you.

A generic error occurred in GDI+

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