Correct Use of Print Statements

[zeller4]

Hello,

I'm using various print statements to check orderstates in my custom strategy using Unmanaged = true.

I continue to get error messages:specifically "Object reference not set to an instance of an object".

Is this a valid print statement?

[FONT=Courier New][SIZE=2]
[SIZE=2][FONT=Courier New]Print([/FONT][/SIZE][/SIZE][/FONT][FONT=Courier New][SIZE=2][COLOR=#800000][FONT=Courier New][SIZE=2][COLOR=#800000][FONT=Courier New][SIZE=2][COLOR=#800000]"longOrder.OrderState:\t"[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Courier New][SIZE=2][FONT=Courier New][SIZE=2]+longOrder.OrderState);[/SIZE][/FONT]
[/SIZE][/FONT]

In other words, will this create the error message?

Or do I first need to check for null?

[FONT=Courier New][SIZE=2][COLOR=#0000ff][FONT=Courier New][SIZE=2][COLOR=#0000ff]
[SIZE=2][FONT=Courier New][COLOR=#0000ff]if[/COLOR][/FONT][/SIZE][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Courier New][SIZE=2][FONT=Courier New][SIZE=2][COLOR=#000000] (longOrder != [/COLOR][/SIZE][/FONT][/SIZE][/FONT][FONT=Courier New][SIZE=2][COLOR=#0000ff][FONT=Courier New][SIZE=2][COLOR=#0000ff][FONT=Courier New][SIZE=2][COLOR=#0000ff]null[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Courier New][SIZE=2][FONT=Courier New][SIZE=2][COLOR=#000000]) Print([/COLOR][/SIZE][/FONT][/SIZE][/FONT][FONT=Courier New][SIZE=2][COLOR=#800000][FONT=Courier New][SIZE=2][COLOR=#800000][FONT=Courier New][SIZE=2][COLOR=#800000]"longOrder.OrderState:\t"[/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][/COLOR][/SIZE][/FONT][FONT=Courier New][SIZE=2][FONT=Courier New][SIZE=2][COLOR=#000000]+longOrder.OrderState);[/COLOR][/SIZE][/FONT]
[/SIZE][/FONT]

I believe it has to do with a null reference not being checked but not sure where to look next. If it's more than just checking for null at the print statements, I'll post the code.

Thanks,
Kirk

[NinjaTrader_Bertrand]

Kirk, correct you should add a != null check before attempting to access the IOrder objects in your prints.

http://www.ninjatrader.com/support/forum/showthread.php?t=4226

[zeller4]

Thanks Bertrand,

I appreciate the link.

Kirk