passing two dimensional C style array to Objective C method

Question

.h file

@interface GameState :NSObject{
int SymbolsPositions[3][5];
}
-(void)SaveCurrentGameState:(int **)Array;
@end


@interface GameViewController : UIViewController 
{
  ...
 int sequence_after_spin[3][5];
  ...
}
-(Void)AMethod;
@end

.m file

@implementation GameState
-(void)SaveCurrentGameState:(int **)Array
{   
    for(int i = 0;i<5;i++)
     for(int j = 0;j<3;j++)
       NSLog(@" %d",Array[j][i]);
}
 @end


@implimentation GameViewController
-(void)AMethod
 {
   [instanceOfGameState SaveCurrentGameState:sequence_after_spin];
  }
@end

the application crashes when ever AMethod is called iget following warning

warning: incompatible pointer types sending 'int [10][5]' to parameter of type 'int **' [-pedantic]

Add the crash log too. Crash might be for a different reason. — Deepak Danduprolu
– Deepak Danduprolu, Commented Jul 15, 2011 at 8:12

Jesus Ramos · Accepted Answer · 2011-07-15 08:13:28Z

5

The argument needs to take an array of int[][5], the reason for this is because the compiler needs to know the number of columns to correctly identify where the members are. You could also specify int[10][5] as the parameter type if you always take the same size array.

answered Jul 15, 2011 at 8:13

Jesus Ramos

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Comments

Deepak Danduprolu · Accepted Answer · 2011-07-15 08:18:38Z

0

While there could be other errors, one I see is

for(int i;i<5;i++)
    for(int j;j<3;j++)
        NSLog(@" %d",Array[j][i]);

You are not setting an initial value to i and j. i and j could be any garbage value.

for(int i = 0;i<5;i++)
    for(int j = 0;j<3;j++)
        NSLog(@" %d",Array[j][i]);

answered Jul 15, 2011 at 8:18

Deepak Danduprolu

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