How can I catch all exceptions in C# from libtiff.net TIFFCP.exe

Question

How can I catch all exceptions in C# from libtiff.net TIFFCP.exe I would like to get exceptions from TTIFFCP.exe(Merge, Split) such as DirectoryNotFoundException, FileNotFoundException ... I can see these errors on visula studio debugger window but it does not pass catch block.

I tried like these(I made an error deliberately)

<pre><code>
<hr/>

Code A : 

string[] arguments = 
{
    @"Sample Data\EEEEEEE.tif",
    @"Sample Data\marbles.tif",
    "MergeTiffImages.tif"
};
TiffCP.Program.Main(arguments);

===> nothing return

<hr/>

Code B :

System.Diagnostics.Process p = new System.Diagnostics.Process();
p.StartInfo.UseShellExecute = false;
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.FileName = @"TiffCP.exe";
string path1 = @"Sample Data\EEEEEEE.tif";
string path2 = @"Sample Data\marbles.tif";
string path3 = "MergeTiffImages.tif";
p.StartInfo.Arguments = "\"" + path1 + "\"" + ", \"" + path2 + "\"" + ", \"" + path3 + "\"";
p.Start();
string t = p.StandardOutput.ReadToEnd();

===> string t => ""

<hr/>

Code C :

Process myProcess = new Process();
ProcessStartInfo myProcessStartInfo = new ProcessStartInfo(@"TiffCP.exe");
string path1 = @"Sample Data\EEEEEEE.tif";
string path2 = @"Sample Data\marbles.tif";
string path3 = "MergeTiffImages.tif";
myProcessStartInfo.StartInfo.Arguments = "\"" + path1 + "\"" + ", \"" + path2 + "\"" + ", \"" + path3 + "\"";
myProcessStartInfo.UseShellExecute = false;
myProcessStartInfo.RedirectStandardError = true;
myProcess.StartInfo = myProcessStartInfo;
myProcess.Start();
StreamReader myStreamReader = myProcess.StandardError;
string t = myStreamReader.ReadLine();
myProcess.Close();
===> string t => Open: Failed to open "Sample Data\EEEEEEE.tif" 

</code></pre>

but it does not pass catch block

Is it possible to get Errors from TIFFCP.exe? thanks in advance.

It won't trigger an exception because your process is working correctly, without error. Faulting applications should return a non-zero exit code. — ProgrammingLlama, Oct 30 '18 at 04:40
Possible duplicate of [How to catch exceptions from processes in C#](https://stackoverflow.com/questions/320767/how-to-catch-exceptions-from-processes-in-c-sharp) — ProgrammingLlama, Oct 30 '18 at 04:42
[Secondary duplicate](https://stackoverflow.com/questions/2279181/catch-another-process-unhandled-exception) which looks at launching external .NET executables within the same process, and catching their exceptions that way. — ProgrammingLlama, Oct 30 '18 at 04:43
Thanks provide me a lot of information. I will take "copy original code". I think it's easy for me. — user9591156, Oct 31 '18 at 00:36

score 0 · Accepted Answer · answered Oct 30 '18 at 06:02

0

As I can see you tried two different methods. As others said, Code B won't give you any exception as you can't catch those of a different process.

Code A if you look at the source returns nothing. So it is normal. From there you have two choices: either you copy the code from the main method of this source and manage yourself exceptions OR you get the output and manage errors from there.

answered Oct 30 '18 at 06:02

Master DJon

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Thanks Master. I understand that it can't catch error from different process. I search and found source of TIFFCP.exe as you mentioned. Then I including two files to my Project and run this Project. But still can't catch error because On the Code like this using (Tiff inImage = Tiff.Open(fileAndPageNums[0], "r")) { if (inImage == null) return; if it could not find files return null.... I think I have to little more fix these files but I can see the light at the end. Thank you anyway. – user9591156 Oct 31 '18 at 00:35
You are welcome. If and only if this answer fits your need, you shall accept it. – Master DJon Oct 31 '18 at 02:32

How can I catch all exceptions in C# from libtiff.net TIFFCP.exe

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