How to convert const char* to c#

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Hi,
I'm using a c++ dll file in order to execute some functions,
I'm blocked in this function :

BOOL CLIENT_CapturePicture(
  LONG       hPlayHandle,
  const char *pchPicFileName
);

I'm trying this code but it's not working :

[DllImport("dhnetsdk.dll", CharSet = CharSet.Ansi)]
public static extern bool CLIENT_CapturePicture
    (long hPlayHandle,
    [MarshalAs(UnmanagedType.LPStr)]
    string pchPicFileName);

Please Help me :) &thx

Posted 20-Apr-10 3:27am

mrabet ihsen

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mrabet ihsen · Answer 1 · 2010-04-20T04:32:00

Solution 3

OK, I find the solution, it's to consider

long

in the c++ code as a

int

in c#, Thanks :-O

Posted 20-Apr-10 4:32am

mrabet ihsen

CPallini · Answer 2 · 2010-04-20T03:35:00

Solution 1

I think you need the Marshal.StringToHGlobalAnsi Method.
:)

Posted 20-Apr-10 3:35am

CPallini

mrabet ihsen · Answer 3 · 2010-04-20T03:51:00

Solution 2

It work, but not correctly, the string parameter

string pchPicFileNam

is not examined correctly, I get an output file that have a name like "€mÕ":confused:, Are there other suggestion please

Posted 20-Apr-10 3:51am

mrabet ihsen