Wouldn't it be better if you are porting the app to C# to make use of the
Frameworks Registry functions which are far more maintainable and easier to
get working.
----- Original Message -----
From: "Bill Schmidt" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Saturday, May 18, 2002 6:19 PM
Subject: [DOTNET] Win32 API syntax problem, using C#
> I'm trying to convert a working VB.NET WinForms application to C#, and I'm
> having trouble with the string buffer being returned from a Win32 API
call.
>
> First, my working VB.NET code:
> Public Declare Function GetPrivateProfileString Lib "kernel32" _
> Alias "GetPrivateProfileStringA" _
> (ByVal lpApplicationName As String, _
> ByVal lpKeyName As String, ByVal lpDefault As String, _
> ByVal lpReturnedString As String, ByVal nSize As Integer, _
> ByVal lpFileName As String) As Integer
>
> lngSize = 127
> strDBLocation = Space(lngSize) & Chr(0)
> lngDummy = GetPrivateProfileString("DBLocation", "Path", _
> vbNullString, strDBLocation, lngSize, strINIPath)
> strDBLocation = Left(strDBLocation, InStr(strDBLocation, Chr(0)) - 1)
>
> This code returns the correct strDBLocation string. It also sets lngDummy
> to the length of the returned string (23).
>
> Now, what I think is the equivalent C# code:
> [DllImport("kernel32.dll", EntryPoint="GetPrivateProfileStringA",
> CharSet=CharSet.Ansi)]
> public static extern int GetPrivateProfileString(
> string lpApplicationName, string lpKeyName, string lpDefault,
> string lpReturnedString, int nSize, string lpFileName);
>
> intSize = 127;
> strDBLocation = new string(' ', intSize) + (char) 0;
> intDummy = GetPrivateProfileString("DBLocation", "Path", null,
> strDBLocation, intSize, strINIPath);
> i = strDBLocation.IndexOf((char) 0);
> if (i >= 0)
> strDBLocation = strDBLocation.Substring(0, i);
>
> When I run this in the identical environment, intDummy gets set to 23
> (which is correct), but strDBLocation remains the same as before the call
> to GetPrivateProfileString (a 127-char string filled with spaces). I
> verified that strINIPath is set to the same value as in the VB app.
>
> Can someone please tell me what I'm doing wrong? (I've tried switching to
> CharSet.Auto and CharSet.Unicode, with no success.)
>
> Bill
>
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