GDI+ Error on Bitmap Save

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

Hi,

I have a helper class that has a method to resize images. It takes the
virtual path of an image and resize it to a specified dimension like this.

public void ResizeImageTest(string pathImage, int newDimension)
{
string pathImageOnDisk =
System.Web.HttpContext.Current.Server.MapPath(pathImage);
System.IO.FileStream fs = new System.IO.FileStream(pathImageOnDisk,
System.IO.FileMode.Open, System.IO.FileAccess.ReadWrite,
System.IO.FileShare.ReadWrite);
Image imageOriginal = Image.FromStream(fs);

using (Bitmap bitmapNewImage = new Bitmap(imageOriginal, newDimension,
newDimension))
{
bitmapNewImage.Save(coreFile.GetPhysicalPath(pathImage),
imageOriginal.RawFormat);
}
}

When I try to call this method, it will error out in the line of the
"bitmapNewImage.Save" with this:

Exception Details: System.Runtime.InteropServices.ExternalException: A
generic error occurred in GDI+.

However, it works fine if I save to a different file like this:

string pathDummyImageOnDisk =
System.Web.HttpContext.Current.Server.MapPath("/images/dummyPic.jpg");
bitmapNewImage.Save(pathDummyImageOnDisk, imageOriginal.RawFormat);

I have searched the web and found that my solution might be in here:

http://support.microsoft.com/?id=814675

But I don't really understand the steps, such as how to create a new bitmap
"with a pixel format of more than 8 bits-per-pixel (BPP)", how to "use the
Graphics.FromImage() method to obtain a Graphics object for the second
Bitmap" etc.

Any advice?


Thanks,
WB
 
Sorry, there's a typo in the line with "bitmapNewImage.Save". It is actually
like this:

public void ResizeImageTest(string pathImage, int newDimension)
{
string pathImageOnDisk =
System.Web.HttpContext.Current.Server.MapPath(pathImage);
System.IO.FileStream fs = new System.IO.FileStream(pathImageOnDisk,
System.IO.FileMode.Open, System.IO.FileAccess.ReadWrite,
System.IO.FileShare.ReadWrite);
Image imageOriginal = Image.FromStream(fs);

using (Bitmap bitmapNewImage = new Bitmap(imageOriginal, newDimension,
newDimension))
{
bitmapNewImage.Save(pathImageOnDisk, imageOriginal.RawFormat);
}
}

Please help.
 
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