How to use WINAPI functions from c#

[Quilmes]

Hi,

I am trying to use the WINAPI function: GetColorDirectory which is located in mscms.dll. I have done the DLLImport statement properly and i can get one of the buffers to fill. The spec for this function is:

BOOL WINAPI GetColorDirectory(
PCTSTR pMachineName,
PTSTR pBuffer,
PDWORD pdwSize
);

My code to import it is:

[DllImport("mscms.dll&quot]
public static extern bool GetColorDirectory(
string pMachineName,
ref string pBuffer,
ref int pdwSize);

Then i call it using:

int i = 0;
string str = "";
GetColorDirectory (null, ref str, ref i);

What happens is i is filled with an int correctly, but i can never get a result in str.

I know this is simple but i can't see what i'm doing wrong.

Thanks in advance


quilmes

 

[chiph]

Try pre-filling str with 1000 spaces to give the API call some memory to fill.

Chip H.

 

[Quilmes]

Hi thanks for you response..

I tried your suggestion but no luck.. Haven't had much time to fiddle though..


quilmes

 

[raghu75]

HI
Try using A StringBuilder instead of Passing a String..
I hope that Should Work....
raghu