Question

I m using .NET framework (tried 3.5 & 4.0) to load a .TIFF file and save it as .PNG. I expect two subsequent calls to the Save() method (using the same TIFF file) to produce the same PNG file. The produced files are, however, sometimes different.

The C# Code below show the problem:

Image sourceToConvert = Bitmap.FromFile("c:\tmp\F1.tif");
sourceToConvert.Save("c:\tmp\F1_gen.png", ImageFormat.Png);           

for (int i = 0; i < 100; i++)
{
    sourceToConvert = Bitmap.FromFile("c:\tmp\F1.tif");
    sourceToConvert.Save("c:\tmp\F1_regen.png", ImageFormat.Png);

    if (!CompareFileBytes("c:\tmp\F1_gen.png", "c:\tmp\F1_regen.png"))
        MessageBox.Show("Diff" + i);                
}

This will display Diff at iteration 8, 32, 33, 73 114, 155, 196 on Windows 64, while it does not display any errors on 32 bit machines. (I use x86 target; with x64 target, it is worse: diff at iteration 12, 13, 14, 15, ...)

是否有办法从“拯救”获得可再生的成果?

可在

Answer 1

我可以解释为什么会发生这种情况,但看来,在定稿人版上的“代码>ImageImage ImplementsIDisposable,因此,请打电话Dispose,在您重新使用该代码后加以最终清理;否则,该编码今后将任意确定。)

如果我把你的榜样代码改为如下,那么我从每次打电话到<代码>就获得同样的结果。 Save :

using (Image sourceToConvert = Bitmap.FromFile("c:\tmp\F1.tif"))
    sourceToConvert.Save("c:\tmp\F1_gen.png", ImageFormat.Png);           

for (int i = 0; i < 100; i++)
{
    using (Image sourceToConvert = Bitmap.FromFile("c:\tmp\F1.tif"))
        sourceToConvert.Save("c:\tmp\F1_regen.png", ImageFormat.Png);

    // files are the same
}

请注意,我确实发现另一个奇怪之处:在运行一个32比(x86)时,在Windows 7 SP1 x64上,第一个 2<>。电话Save 退回了不同结果,随后每次打电话到Save ,所产生的产出与第二次访问相同。为了给测试通行证,我必须重复头两条线(在休息前),以便在进行平等检查之前强迫两个储蓄。

友情链接