MODI leaking memory
- by Khragg
I have an app where I'm using MODI 2007 to OCR several multi-page tiff files. I have found that when I kick it off on a directory that contains several good tiffs but also some tiffs that cannot be opened in Windows Picture and Fax Viewer, then MODI also fails to OCR those "bad" tiffs. When this happens, the app is unable to reclaim any of the memory that was used by MODI to OCR those tiffs. After the tool tries to OCR too many of these "bad" tiffs, the machine runs out of memory and the app crashes. I have tried several code fixes from the web that supposedly fix any MODI memory leaks, but so far none have worked for me. I am pasting in the part of the code below that does the OCRing:
StringBuilder strRecText = new StringBuilder(10000);
MODI.Document doc1 = new MODI.Document();
doc1.Create(name);
try
{
doc1.OCR(MODI.MiLANGUAGES.miLANG_ENGLISH, true, true); // this will ocr all pages of a multi-page tiff file
}
catch (Exception e)
{
doc1.Close(false); // clean up
if (doc1 != null)
{
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
GC.WaitForPendingFinalizers();
System.Runtime.InteropServices.Marshal.FinalReleaseComObject(doc1);
doc1 = null;
}
}
MODI.Images images = doc1.Images;
for (int imageCounter = 0; imageCounter < images.Count; imageCounter++)
{
if (imageCounter > 0)
{
if (!noPageBreakFlag)
{
strRecText.Append((char)pageBreakChar);
}
}
MODI.Image image = (MODI.Image)images[imageCounter];
MODI.Layout layout = image.Layout;
strRecText.Append(layout.Text);
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
GC.WaitForPendingFinalizers();
if (layout != null)
{
System.Runtime.InteropServices.Marshal.FinalReleaseComObject(layout);
layout = null;
}
if (image != null)
{
System.Runtime.InteropServices.Marshal.FinalReleaseComObject(image);
image = null;
}
}
File.AppendAllText(ocrFile, strRecText.ToString()); // write the OCR file out to disk
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
GC.WaitForPendingFinalizers();
if (images != null)
{
System.Runtime.InteropServices.Marshal.FinalReleaseComObject(images);
images = null;
}
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
GC.WaitForPendingFinalizers();
doc1.Close(false); // clean up
if (doc1 != null)
{
System.Runtime.InteropServices.Marshal.FinalReleaseComObject(doc1);
doc1 = null;
}
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
GC.WaitForPendingFinalizers();
