C# try/catch help

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Tanis Half Elf
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C# try/catch help

Postby Tanis Half Elf » Wed Apr 22, 2009 8:07 pm

Not sure if any of you are familiar with C#, but here is my problem

The program I made will run fine because I am using a try/catch statement when debugging. When I am not in debug mode or after the program is installed, the try/catch statement will not work. Is there anything similar to this in C# that will work when not in debug mode?


Additional Details
Here is the method I am using it in:

public void printBridge(string chosenPrinter)
{
try
{
printPreviewDialog1.ShowDialog();
}
catch
{
MessageBox.Show("Unable to set a default printer. The printer may not exist or the WScript.Network com object may have a problem.");
}

}



If the printer isn't online and it tries to run this in debug or release mode the exception will be caught and the message box will appear. If I start the program without debugging or try to run the program after I installed it. The program will crash due to the exception not being caught.

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Tanis Half Elf
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Postby Tanis Half Elf » Thu Apr 23, 2009 12:41 pm

I figured it out.

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Darkfoxx
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Postby Darkfoxx » Thu Apr 23, 2009 12:42 pm

Sorry no one helped, but I'm not a programmer.
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Tanis Half Elf
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Postby Tanis Half Elf » Thu Apr 23, 2009 11:02 pm

Yea, i didnt think there were too many programmers left in the forums. But i was using every resource i had.

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Elric of the void
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Postby Elric of the void » Fri Apr 24, 2009 12:29 am

I did have one of my buddies look at it, you posted you found a solution before a managed to post it >.< , next time ill post it faster :)
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Tanis Half Elf
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Postby Tanis Half Elf » Fri Apr 24, 2009 11:57 pm

Well, i thought i found a solution, but it worked once, and not anymore. I think it was coincidence, it is a mystery. If that other solution gets posted that would be awesome! Thanks for having one of your buddies look at the code.

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Elric of the void
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Postby Elric of the void » Sat Apr 25, 2009 10:31 am

he solution was to avoid doing this, he said that this action should already be automated and that this would, if anything cause conflicts.
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dun dun dun... chips
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Postby dun dun dun... chips » Sat Apr 25, 2009 2:33 pm

what are you using try/catch for?

edit: why are you using it for debugs?

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Tanis Half Elf
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Postby Tanis Half Elf » Sat Apr 25, 2009 2:58 pm

The try/catch is used to catch the exception that is thrown when the printer is offline when trying to print to it.. From what I understand this only happens with some printer drivers. When the program catches the exception it puts up an error message telling the user to select a different printer.

If there is no try catch the exception will go through and crash the program. I am giving a presentation showing off our program in 2 weeks, in front of a lot of faculty and professionals in the field. If they find a bug to crash our program we will get grilled.

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Postby dun dun dun... chips » Sat Apr 25, 2009 3:24 pm

whats not working with it?
is there a compiler error, or is it just not doing anything?

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Tanis Half Elf
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Postby Tanis Half Elf » Sat Apr 25, 2009 9:49 pm

Yea, it wasnt doing anything. Like it was not catching the exception. It would only catch the exception in debug mode or release mode, but not in start without debugging or when I installed the program onto my computer.

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Postby dun dun dun... chips » Sat Apr 25, 2009 10:18 pm

when you say its not doing anything, is the exception supposed to be thrown and its not catching it, or is there no exception being thrown?

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Tanis Half Elf
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Postby Tanis Half Elf » Sun Apr 26, 2009 1:43 pm

There is an exception being thrown, but it isn't being caught; therefore, crashing my program.

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Postby dun dun dun... chips » Sun Apr 26, 2009 6:43 pm

hmm... interesting.
im not good with c#, ive never decided to sit down and learn a language only for windows... :|
however, i know that with java, c, and obj-c, in the catch bit, you need to have what it is catching in parentheses or something like that.
maybe its different in c#

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Tanis Half Elf
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Postby Tanis Half Elf » Sun Apr 26, 2009 10:52 pm

Yea, you dont need anything in parenthesis, but it is recommended. I went about this another way.
I decided to read whether the selected printer is offline or online. eg)connected or not connected.
I actually started off trying to do this and could never figure this out. I've spent hours researching
this in the past with no luck, but I got lucky and decided to try it a different way from the general public.
It worked, so I can now tell if the printer is online or not. If so, i will have it print. If not i will throw up an
error message to the user. Funny thing is now the program wont print period! Kinda, weird since i
didnt even mess with that block of code. I think it may be my hp printer, so i am getting a group member to test it.

Ohh, and regarding languages, all the .Net language are growing very fast. Especially C# and VB in the south.


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