Starting a C# application does nothing...then native exception

  • Thread starter Thread starter Kevin S.
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Kevin S.

Hi,

I have an application (fairly large) written in C# (VS2008). It is built for the
Pocket PC 2003 platform, but runs on PPC2003, WinCE 4.2, WM5, WM6.1. I am
running this on several Intermec mobile computers: 700 color series, CN2, CN3,
CN50, and CK3. I'm also distributing CF 2.0 (for those devices that don't have
it) and SQL Server CE 3.5

Just recently, I've run into a problem where the user will tap on the
application icon and it will "hang" for about 3-5 minutes. When it comes back,
it says:

A native exception has occurred in <my app name>. Select Quit and then
restart this program, or select Details for more information.

When the [Details] button is tapped, the following is displayed:

ExceptionCode: 0xc0000005
ExceptionAddress: 0x78285d28 (obviously, this is different every time)
Reading: 0x00000040 (this may also be different every time)

I've found a few items that talk about accessing a database in different threads
at the same time. I don't think that's my problem. I've deleted the database and
run the application (which will create the database automatically). I still get
the message and no database was created.

I also found a few items that talk about issues with CF2 and SQL Server Compact
3.5. I'm not doing anything with a database until the user logs in. So, this may
not be the problem.

Has anyone run into this type of error? I know that Exception Code 0xc0000005 is
a pretty vague code.

Thanks in advance for any help.

Kevin S.
 
0xc0000005 is an access exception. Generally, you'd expect that to occur if
you're using an invalid pointer or some code that you are calling is using an
invalid pointer. Since it seems that you're saying that the main window is
never shown, look at the code triggered in Form_Load() and see what it does.
Commenting out some of that code, strategically, might narrow down who is
doing the wrong thing. I have a fair amount of code that does SQLCE 3.5
stuff on startup and it never crashes in that way, so I'm inclined to suspect
some P/Invoking that you're doing, etc.

Paul T.
 
Thanks, Paul.

I think I forgot to mention that this does not happen on every device. So, it's
hard for me to simply debug it to find the faulty code. I've not personally
experienced it on a device at the office. It seems to happen on devices out in
the field. Thanks for the advice, though. If I can get the problem to happen
locally, or I can get one of the devices that's having the problem, I try it out.

Kevin

0xc0000005 is an access exception. Generally, you'd expect that to occur if
you're using an invalid pointer or some code that you are calling is using an
invalid pointer. Since it seems that you're saying that the main window is
never shown, look at the code triggered in Form_Load() and see what it does.
Commenting out some of that code, strategically, might narrow down who is
doing the wrong thing. I have a fair amount of code that does SQLCE 3.5
stuff on startup and it never crashes in that way, so I'm inclined to suspect
some P/Invoking that you're doing, etc.

Paul T.

Kevin S. said:
Hi,

I have an application (fairly large) written in C# (VS2008). It is built for the
Pocket PC 2003 platform, but runs on PPC2003, WinCE 4.2, WM5, WM6.1. I am
running this on several Intermec mobile computers: 700 color series, CN2, CN3,
CN50, and CK3. I'm also distributing CF 2.0 (for those devices that don't have
it) and SQL Server CE 3.5

Just recently, I've run into a problem where the user will tap on the
application icon and it will "hang" for about 3-5 minutes. When it comes back,
it says:

A native exception has occurred in<my app name>. Select Quit and then
restart this program, or select Details for more information.

When the [Details] button is tapped, the following is displayed:

ExceptionCode: 0xc0000005
ExceptionAddress: 0x78285d28 (obviously, this is different every time)
Reading: 0x00000040 (this may also be different every time)

I've found a few items that talk about accessing a database in different threads
at the same time. I don't think that's my problem. I've deleted the database and
run the application (which will create the database automatically). I still get
the message and no database was created.

I also found a few items that talk about issues with CF2 and SQL Server Compact
3.5. I'm not doing anything with a database until the user logs in. So, this may
not be the problem.

Has anyone run into this type of error? I know that Exception Code 0xc0000005 is
a pretty vague code.

Thanks in advance for any help.

Kevin S.
.
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