内存泄漏，大量位图图像C ++ CLI

Question

I'm getting an out of memory error. I have one form in a picture-processing app.

Here is the relevant portion of code from a void routine:

Image^ CurrentImage;
Image^ ProcessedImage;
for(int i=0; i<NumSourceFiles; i++) {
   CurrentImage = Image::FromFile(File[i]);
   ProcessedImage = ProcessImage(CurrentImage, ShrinkToWidth, ShrinkToHeight, Rectangle(LeftOrigin,TopOrigin,CropWidth,CropHeight));
   NumFiles++;  //increment to get next number to save
   NextFileName = folderName_specific+"\\"+SelectedCondition+"_"+Convert::ToString(NumFiles)+".jpg";
   ProcessedImage->Save(NextFileName, ImageFormat::Jpeg);
   delete CurrentImage;
   delete ProcessedImage;
}

Now here is the ProcessImage routine:

private: Image^ ProcessImage(Image^ img, int width, int height, Rectangle cropArea)  //shrink and crop
{
   Bitmap^ bmpImage = gcnew Bitmap(img);
   bmpImage = bmpImage->Clone(cropArea, bmpImage->PixelFormat);
   Bitmap^ bmpImage1 = gcnew Bitmap(bmpImage, width, height);
   delete bmpImage;
   return bmpImage1;
}

If I get rid of all the delete statements, then it will process around 200 images before running out of memory. If I remove the two delete statements in the void routine it will process about 300. If I keep them all in it will do around 500 images before an out of memory failure. It always fails at the first statement of the ProcessImage routine.

I tried making bmpImage1 a global variable and deleting it in the void routine, but that didn't help. Any idea where I'm building up memory?

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Update 12April2018: I simplified this as follows (stuck it all in the for/next loop) and it STILL runs out of memory after 550 or so pictures are saved. Stumped.... Really need to solve this... Lil' help? (Pretty please with sugar on top!)

for(int i=0; i<NumSourceFiles; i++) {
    Image^ CurrentImage = Image::FromFile(File[i]);
    NumFiles++;  //increment to get next number to save
    NextFileName = folderName_specific+"\\"+SelectedCondition+"_"+Convert::ToString(NumFiles)+".jpg";
    Bitmap^ bmpImage = gcnew Bitmap(CurrentImage);
    bmpImage = bmpImage->Clone(Rectangle(LeftOrigin,TopOrigin,CropWidth,CropHeight), bmpImage->PixelFormat);
    Image^ ProcessedImage = gcnew Bitmap(bmpImage, ShrinkToWidth, ShrinkToHeight);
    ProcessedImage->Save(NextFileName, ImageFormat::Jpeg);
    delete bmpImage;
    delete ProcessedImage;
    delete CurrentImage;
}

Answer 1

Solved it by adding these two statements after the three delete statements:

GC::Collect(); GC::WaitForPendingFinalizers();

You must use both statements in this order. Memory leak vanquished.