CreateFile

[JLW]

I'm having alot of difficulty with this one. I have seen no less than 20
different ways to use this function with a named pipe. I'm trying to use
\\.\TAPE0 (TapeDrive).
Here's my decleration:

[DllImport(
"kernel32.dll",
SetLastError=true,
EntryPoint="CreateFileA"
)]
internal static extern IntPtr CreateFile(
String filename,
UInt32 desiredAccess,
UInt32 shareMode,
IntPtr attributes, // Really, this is the SECURITY_ATTRIBUTES pointer
UInt32 creationDisposition,
UInt32 flagsAndAttributes,
IntPtr templateFile
);

And here's my call:
_Handle = CreateFile(
@"\\.\TAPE0",
GENERIC_READ | GENERIC_WRITE,
0,
IntPtr.Zero,
CREATE_NEW,
0,
IntPtr.Zero
);

It returns -1, so it's not working.

Thanks
JLW

 

[Nicholas Paldino [.NET/C# MVP]]

JLW,

I would use the following declaration for CreateFile:

[DllImport("kernel32.dll", SetLastError=true, CharSet=CharSet.Auto)]
internal static extern IntPtr CreateFile(
String filename,
UInt32 desiredAccess,
UInt32 shareMode,
IntPtr attributes, // Really, this is the SECURITY_ATTRIBUTES pointer
UInt32 creationDisposition,
UInt32 flagsAndAttributes,
IntPtr templateFile);

I have a feeling that the conversion of the string is not occuring
correctly, and that is the cause of the problem.

Hope this helps.

 

[John Wood]

You may also want to check out this article on using named pipes in C#:

http://www.codeproject.com/csharp/DotNetNamedPipesPart2.asp

 

[Mohamoss]

Hi JLW
This sample project with souce code may help on how to use pipe with c#
http://www.codeproject.com/csharp/DotNetNamedPipesPart2.asp
.Best regards,

Mohamed Mahfouz
MEA Developer Support Center
ITworx on behalf of Microsoft EMEA GTSC

 

[JLW]

Well, nothing seems to wanna work, so I guess I'm going to have to scrap
this project alltogether and chalk it up to "Not dooable at this time"

Thanks,
JLW