P/Invoke Interop Assistant uint type cast question

[Tim Sprout]

The P/Invoke Interop Assistant (http://www.codeplex.com/clrinterop)
generates a signature for GetDefaultPrint er using an uint type for
pcchBuffer:

public static extern bool GetDefaultPrint er([OutAttribute()]
[MarshalAsAttrib ute(UnmanagedTy pe.LPStr)] StringBuilder pszBuffer, ref
uint pcchBuffer);

However, StringBuilder only accepts type int. Is it safe to cast uint to
int?

The GetDefaultPrint er signature on pinvoke.net uses an int type for
pcchBuffer, so a cast is not necessary.

Thanks,

Tim Sprout

[Mark Salsbery [MVP]]

Re: P/Invoke Interop Assistant uint type cast question

"Tim Sprout" <tman@ptialaska .netwrote in message
news:utq6sN0GJH A.1156@TK2MSFTN GP04.phx.gbl...

The P/Invoke Interop Assistant (http://www.codeplex.com/clrinterop)
generates a signature for GetDefaultPrint er using an uint type for
pcchBuffer:
>
public static extern bool GetDefaultPrint er([OutAttribute()]
[MarshalAsAttrib ute(UnmanagedTy pe.LPStr)] StringBuilder pszBuffer, ref
uint pcchBuffer);
>
However, StringBuilder only accepts type int. Is it safe to cast uint to
int?
>
The GetDefaultPrint er signature on pinvoke.net uses an int type for
pcchBuffer, so a cast is not necessary.

It doesn't make a difference since an int and a uint are the same size.

Technically, ref uint is the correct type for the GetDefaultPrint er() call,
but if it's easier to use an int then go for it :)

I personally prefer to use the type that will need the least amount of
casting.

Mark

--
Mark Salsbery
Microsoft MVP - Visual C++

>
Thanks,
>
Tim Sprout

[Tim Sprout]

Re: P/Invoke Interop Assistant uint type cast question

Mark Salsbery [MVP] wrote:

"Tim Sprout" <tman@ptialaska .netwrote in message
news:utq6sN0GJH A.1156@TK2MSFTN GP04.phx.gbl...

>The P/Invoke Interop Assistant (http://www.codeplex.com/clrinterop)
>generates a signature for GetDefaultPrint er using an uint type for
>pcchBuffer:
>>
>public static extern bool GetDefaultPrint er([OutAttribute()]
>[MarshalAsAttrib ute(UnmanagedTy pe.LPStr)] StringBuilder pszBuffer, ref
>uint pcchBuffer);
>>
>However, StringBuilder only accepts type int. Is it safe to cast uint
>to int?
>>
>The GetDefaultPrint er signature on pinvoke.net uses an int type for
>pcchBuffer, so a cast is not necessary.

>
>
It doesn't make a difference since an int and a uint are the same size.
>
Technically, ref uint is the correct type for the GetDefaultPrint er()
call, but if it's easier to use an int then go for it :)
>
I personally prefer to use the type that will need the least amount of
casting.
>
Mark
>

Thanks, Mark!

Tim Sprout