Chuck Heatherly wrote:

> I am calling ODBC API functions from a C# program. At first I was specifying
> CharSet=CharSet.Unicode because I wanted to assume that the Unicode versions
> were available. However, now I think I need to check whether the ANSI functions
> are being called.

wrote:

>Hi Chuck,
>
>I agree with Rob's suggestion. We can use CharSet.Auto.
>CharSet.Auto
>Platform invoke chooses between ANSI and Unicode formats at run time, based
>on the target platform.
>http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/htm
>l/cpconcharsetobjectfield.asp
>
>Auto
>Supported by the .NET Compact Framework.
> Automatically marshal strings appropriately for the target operating
>system. The default is Unicode on Windows NT, Windows 2000, Windows XP, and
>the Windows Server 2003 family; the default is Ansi on Windows 98 and
>Windows Me.
>http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/
>frlrfsystemruntimeinteropservicescharsetclasstopic.asp

On Wed, 29 Sep 2004 12:08:44 +0200, Robert Jordan <robertj@gmx.net> wrote:

>Chuck Heatherly wrote:
>> On Wed, 29 Sep 2004 03:16:06 GMT, v-phuang@online.microsoft.com ("Peter Huang")
>> wrote:
>>
>>
>>>Hi Chuck,
>>>
>>>I agree with Rob's suggestion. We can use CharSet.Auto.
>>>CharSet.Auto
>>>Platform invoke chooses between ANSI and Unicode formats at run time, based
>>>on the target platform.
>>>http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/htm
>>>l/cpconcharsetobjectfield.asp
>>>
>>>Auto
>>>Supported by the .NET Compact Framework.
>>>Automatically marshal strings appropriately for the target operating
>>>system. The default is Unicode on Windows NT, Windows 2000, Windows XP, and
>>>the Windows Server 2003 family; the default is Ansi on Windows 98 and
>>>Windows Me.
>>>http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/
>>>frlrfsystemruntimeinteropservicescharsetclasstopic.asp
>>
>>
>> I don't understand how this answers my question though. I want to know how to
>> tell elsewhere in my code whether the ANSI or Unicode version of the function
>> was chosen.
>
>You can query Marshal.SystemDefaultCharSize. When it's 2,
>then the Unicode functions will be called, unless you
>overrode the P/Invoke DllImport declaration with CharSet.Ansi.

Chuck Heatherly wrote:
> On Wed, 29 Sep 2004 03:16:06 GMT, v-phuang@online.microsoft.com ("Peter Huang")
> wrote:
>
>
>>Hi Chuck,
>>
>>I agree with Rob's suggestion. We can use CharSet.Auto.
>>CharSet.Auto
>>Platform invoke chooses between ANSI and Unicode formats at run time, based
>>on the target platform.
>>http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/htm
>>l/cpconcharsetobjectfield.asp
>>
>>Auto
>>Supported by the .NET Compact Framework.
>>Automatically marshal strings appropriately for the target operating
>>system. The default is Unicode on Windows NT, Windows 2000, Windows XP, and
>>the Windows Server 2003 family; the default is Ansi on Windows 98 and
>>Windows Me.
>>http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/
>>frlrfsystemruntimeinteropservicescharsetclasstopic.asp
>
>
> I don't understand how this answers my question though. I want to know how to
> tell elsewhere in my code whether the ANSI or Unicode version of the function
> was chosen.