Calling a DLL with LPSTR parameters

[Arnau Font]

Hi,

I'm trying to invoke a function in a DLL, using DllImport. One of the
parameters is a ANSI string, but the CharSet enumeration has only the Auto
and Unicode members. How can I send a string in ANSI to the DLL?


[DllImport("Protocol.dll", CharSet = CharSet.Auto)]
static extern int Configure(string password, uint pwdSize); //The password
should be passed as ANSI

Thanks!

 

[José Miguel Torres]

Try using StringBuilder.

regards

 

[Peter Foot [MVP]]

use:-
[DllImport("Protocol.dll")]
static extern int Configure(byte[] password, uint pwdSize); //The password
should be passed as ANSI

And use System.Text.Encoding.ASCII.GetBytes() to get the byte array for your
string, and pass this into the function.

Peter

 

[Sergey Bogdanov]

Why you do not want to modify native part that it would receive UNICODE
string?

If this is impossible, you can try to pass your string as byte array:

byte [] b = System.Text.Encoding.ASCII.GetBytes("Password");
Configure(b, b.Length);

....

[DllImport("Protocol.dll")]
static extern int Configure(byte [] password, int pwdSize);

Best regards,
Sergey Bogdanov
http://www.sergeybogdanov.com