So, I'm trying to read through a directory of tiff images, some are single and some are multi-page --all should be group-4 compressed, and write on the images and save them back out in the same structure (number offrames per file). I thought it was working for a while before discovering that I had to deal with multi-page tiffs.

I'm modeling my code on some from BobPowell.combut I'm not getting it all to come together. I'll post a block of code below, but basically, the image.SaveAdd(Image, EncoderParameter) is throwing a generic error. I've searched around and come up with e.g. these articles and this one and others, but nothing that's solving my problem. I've tried disposing the images at various places and not disposing at all and get no change in results.

It's entirely possible that I've messed stuff up that I had working (the order of assignment of the enParams.Param(0) states, etc. So, feel free to point that out if you see it, but also, know that I can probably get that back to working OK once I have this save problem worked out (unless of course, they're linked).

Here's my code:

Thanks for your time,

Chris

When I got this error it was a permission problem. Make sure the user has write access to this folder.

When I got this error it was a permission problem. Make sure the user has write access to this folder.

Yeah, I saw that that was the issue sometimes, but it's not a problem for me. E.g. the Image.Save that fires on the first page (as well as some index-logging) writes to that location just fine.

MY SOLUTION TO: A generic error occurred in GDI+
I'm not sure "WHY" this works ... but it solved my problems.

Caveat: Below uses [ImageFormat.Bmp] If you're reading/writing another format, you'll need to tweak.

Caveat: During the write operation a temporary file named [temporaryToDefeatGDIerror.bmp] is momentarily created, copied then deleted.

Here's a general Function class which does the real work.
------------------------------------------------------------------------------------
class fn
{
public static void SaveImageToFile(string DrvPath, string FileExt, Bitmap bm)
{
string actualDPFEwanted = DrvPath + FileExt;
if (File.Exists(actualDPFEwanted) == true) File.Delete(actualDPFEwanted);
string tempDPFE = DrvPath + "temporaryToDefeatGDIerror.bmp";
if (File.Exists(tempDPFE) == true) File.Delete(tempDPFE);
bm.Save(tempDPFE, ImageFormat.Bmp);
File.Copy(tempDPFE, actualDPFEwanted);
File.Delete(tempDPFE);
}
public static Bitmap GetImageDisconnectedFromFile(string DrvPathFileExt)
{
Image Iret = (Image)new Bitmap(1,1);
if (File.Exists(DrvPathFileExt) == true)
{
FileInfo FI = new FileInfo(DrvPathFileExt);
if (FI.Length > 1)
{
Stream s = File.Open(DrvPathFileExt, FileMode.Open);
Iret = Image.FromStream(s);
s.Close();
}
}
Bitmap BM = new Bitmap(Iret);
Iret.Dispose();
GC.Collect(0, GCCollectionMode.Forced);
return BM;
}
}
------------------------------------------------------------------------------------
and here's a sample of how I use each fn.call's
------------------------------------------------------------------------------------
private void ReadOne()
{
string DP = String.Format("{0}\\ImageSink\\", Path.GetDirectoryName(Application.ExecutablePath));
if (!Directory.Exists(DP)) Directory.CreateDirectory(DP);
if (File.Exists(DP + "a.bmp") == true) picturebox1.Image = fn.GetImageDisconnectedFromFile(DP + "a.bmp");
}

private void WriteOne()
{
string DP = String.Format("{0}\\ImageSink\\", Path.GetDirectoryName(Application.ExecutablePath));
if (!Directory.Exists(DP)) Directory.CreateDirectory(DP);
if (!(picturebox1.Image == null)) fn.SaveImageToFile(DP, "a.bmp", (Bitmap)picturebox1.Image);
}
------------------------------------------------------------------------------------

Enjoy y'all
Frederick Volking

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Fred