P/Invoke of CallBack with char* params: return error
- From: "Lionel Reyero" <LionelReyero@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Tue, 14 Feb 2006 13:13:26 -0800
Hi there,
I am trying to P/Invoke a DLL able to perform a wifi scan.
There is a poll method to which I have to pass a pointer to a function. Then
the native code will call back the passed function which has char* parameters.
I tried to write my P/Invoke (see below) but when I run the application, I
get an exception when the "poll" method is called. The exception has the
following message: Attempted to read or write protected memory. This is often
an indication that other memory is corrupt.
As far as I read, I am not sure that my "delegate" is correct. I am also
unsure about how I should translate the "char *" in C#.
Your help (and code snipets) will be greatly appreciated! Thanks a lot!
Lionel Reyero
==========================
Here is the .h I want to P/Invoke
#ifndef __COMMON_SPOTTER_H__
#define __COMMON_SPOTTER_H__
typedef void (*SawAPFunction)(char *bssid, char *ssid, int rss,int wep,int
infrMode);
/* returns 0 on success, -1 on failure */
int spotter_init();
void spotter_shutdown();
/* returns 0 on success, -1 on failure */
int spotter_poll(SawAPFunction fn);
#endif /* __COMMON_SPOTTER_H__ */
===============================
Here is the P/Invoke I have done:
public delegate void CallBack(IntPtr bssid, IntPtr ssid, int rss, int
wep, int infrMode);
class Spotter
{
[DllImport("spotter.dll",
EntryPoint="_Java_org_placelab_spotter_WiFiSpotter_spotter_1init@8")]
public static extern int init();
[DllImport("spotter.dll", EntryPoint =
"_Java_org_placelab_spotter_WiFiSpotter_spotter_1shutdown@8")]
public static extern void shutdown();
[DllImport("spotter.dll", EntryPoint =
"_Java_org_placelab_spotter_WiFiSpotter_spotter_1poll@8")]
public static extern int poll(CallBack x);
public static void AP_detected(IntPtr bssid, IntPtr ssid, int rss,
int wep, int infrMode)
{
}
}
.
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