For example if i call the method System.IO.Directory.CreateDirectory, within the .NET code the Win32 API method CreateDirectory from kernel32.dll is called.
In the .NET source code the method is declared as following:
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true, BestFitMapping = false)]
internal static extern bool CreateDirectory(
string path,
Win32Native.SECURITY_ATTRIBUTES lpSecurityAttributes);
CharSet is set to CharSet.Auto. It seems that always the Ansi version is called.
My question is if i can force .NET to use the unicode version instead of the Ansi version.
It seems that always the Ansi version is called.
How do you know this? Are you using .NET core on Linux or something? https://docs.microsoft.com/en-us/dotnet/standard/native-interop/charset
In any case, instead of this:
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true, BestFitMapping = false)]
This:
[DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
Alternatively, all Win32 APIs are really macros that map to either an A postfixed version of W postfixed version for ANSI and WIDE (unicode) respectively.
So calling CreateDirectoryW directly should work:
[DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true, ExactSpelling = true)]
internal static extern bool CreateDirectoryW(
string path,
Win32Native.SECURITY_ATTRIBUTES lpSecurityAttributes);