C# Dllimport - pointer to a pointer receiving array -

i trying dllimport function simxgetobjects remoteapi.dll of v-rep software. here link function description: http://www.coppeliarobotics.com/helpfiles/en/remoteapifunctions.htm#simxgetobjects

and here brief description function above link:

description: retrieves object handles of given type, or of types (i.e. object handles)

c synopsis: simxint simxgetobjects(simxint clientid,simxint objecttype,simxint* objectcount,simxint** objecthandles,simxint operationmode)

c parameters:
clientid: client id. refer simxstart.

objecttype: object type (sim_object_shape_type, sim_object_joint_type, etc., or sim_handle_all type of object

objectcount: pointer value receive number of retrieved handles

objecthandles: pointer pointer receive object handle array. array remains valid until next remote api function called. operationmode: remote api function operation mode. recommended operation mode function simx_opmode_oneshot_wait

here way importing (simxgetobjects function):

[dllimport("remoteapi.dll", callingconvention = callingconvention.cdecl)]     public static extern int simxgetobjects(int clientid, string objecttype, intptr objectcount, ref intptr objecthandles, string operationmode); 

and here how calling it:

int intclientid = simxstart("127.0.0.1", 19999, true, true, 5000, 5); intptr intptrobjectcount = intptr.zero; intptr intptrobjecthandles = intptr.zero; simxgetobjects(intclientid, "sim_handle_all", intptrobjectcount, ref intptrobjecthandles, "simx_opmode_oneshot_wait"); 

it not show error, both intptrobjectcount , intptrobjecthandles variables zero.

i appreciate if can me on this.

try this:

[dllimport("remoteapi.dll", callingconvention = callingconvention.cdecl)] public static extern int simxgetobjects(     int clientid,      int objecttype,      out int objectcount,      out intptr objecthandles,      int operationmode );  int objectcount; intptr objecthandles;  int result = simxgetobjects( clientid,                               objecttype,                           out objectcount,                           out objecthandles,                               operationmode ); if( result == 0 && objecthandles != intptr.zero ) {     for( int index = 0; index < objectcount; index++ )     {         intptr handle = (intptr)((int)objecthandles + index*4);          // handle                 } }