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It is probably because the properties of that file indicate that it should be copied to the bin\Debug directory when starting the application in Visual Studio. Change the properties so it does not always copy, or run your application from outside of Visual Studio.
Use the best guess
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It is indicated that 'copy if newer' in the properties.
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Then you should check that it can write into the destination folder successfully. It's impossible (from here) to discover why the copy is failing.
Use the best guess
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Yes I know it's difficult from (there)to discover .but thank you for your help.
I have tried few times opening the application and now it works ...but will check why it happened ,because it might fall apart again.
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It may well be that you have some connection left open somewhere that is preventing the copy from succeeding. It is probably best to run your tests outside of Visual ~Studio so that the copying of the database is not actually part of your test.
Use the best guess
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This is just a stab in the dark, but possibly a typo? Maybe "Danial" should be "Daniel"?
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Hi
I have written a code in C# to load functions in an unmanaged dll.
This is the code.
class Program
{
static unsafe void Main(string[] args)
{
int deviceNr;
char* Info;
int intMyReturnVal;
deviceNr = 0;
Info = null;
intMyReturnVal = sample_getinfo(deviceNr, Info);
}
[DllImport("opcard2lib.dll")]
private unsafe static extern int sample_getinfo(int deviceNr, char* Info);
}
and this is the API function description by dll supllier.
1. Sample_GetInfo
Prototype:
DLLReturnType
Sample_GetInfo (int deviceNr,
char* Info);
Parameters:
deviceNr is a number of found card in system
Info is handler for string with information about current card in system
Returns:
Returns 0 (zero) when success. Otherwise return an error code.
Description:
This function provide information about installed card in system. Information returned
in Info string looks like below:
„SN YY.SN rev. RRR", where:
YY – year of production
SN – serial number
RRR – firmware revision
The problem is that when I run this code I get the bellow error exception:
Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
I have written this in VB.net to and get the same result.
I would appreciate your help.
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The library function will store some data into the memory pointed to by Info so it needs to contain a valid address. You initialised it to null which is zero, an invalid address. You need something like:
char* Info;
Info = new char[128];
Use the best guess
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thanks dear friend.
I will check it soon.
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I notice that you also posted this question at Problem with P/Invoke[^] in Quick Answers. Please post in one forum only.
Use the best guess
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it gives this exception
cannot implicitly convert from char[] to char*
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Please show your code, what I provided compiles successfully, so i can only assume you have done something different.
Use the best guess
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I just added this line to code as you mentioned.
Info = new char[255];
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Please show the code block where the error occurs, indicate the line in error and the exact text of the error message.
Use the best guess
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hi dear Richard MacCutchan
I think i have problem when the argument of the function is of pointer type.
I checked functions with no pointer and there was no problem.
As I searched the net I saw that something about Marshaling but I don't know how to implement it.
Is this the way or you suggest something else?
Thanks
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Nooredin wrote: I think i have problem when the argument of the function is of pointer type. I checked functions with no pointer and there was no problem.
That does not make sense, it just means that your function call does not match the function definition.
As to the remaining issue, if you have a problem with the code then you need to show us the code and any error messages you receive. If you need help in understanding how to use P/Invoke then I would suggest reading this white paper[^].
Use the best guess
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hi dear Richard MacCutchan
you have helped me a lot with this. I appreciate it.
the most unbelievable problem with that dll was some functions did not included in the dll but described in manual and unfortunately i was focused on them 
I have mostly done with this except introducing char array pointer to dll.
I wish I can do it soon.
By the way, thanks for your kind help.
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Hi All,
My application is hosted in four servers. I wanted to create a tool that will be installed in any one of those servers. Purpose of this tool is to monitor App pool crash in each server and trigger a mail.
Could someone let me know how we can write this code in .Net?
Cheers
A.M.Jegan
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amjegan wrote: Could someone let me know how we can write this code in .Net?
The application does something.
Your app periodically verifies that it is continuing to do something. If it isn't then send the email.
The specifics of that depends on what the application does.
And if the servers are load balanced and you really want to test each then you need a way to specifically kick off the task in each. So if each responds to some IP trigger then you need a way to independently send that trigger to each. Router/firewall and dns resolution might be involved to get that to work.
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I have created xml file with node element and child elelement. I have created asp.net application using VS2008 and am unable to write to that XML file. Its giving already another process is using. Access dinied.
How to do this.
If anybody knows please reply me.
Thanks in advance.
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Do not post your question in different places.
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If the file is locked by amnother process you can't write to it. It's that simple. You have to wait for the other process to let go of the file.
If the process is the very same one you're writing, well, then you've done something wrong where you didn't close the file. You can't have more than one exclusive writer to the same file.
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NO I have created application that displays a message on desktop always using that XML file and I need to change that XML message so that application keeps message changing on desktop.
how to do that
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