NULL undeclared identifier !

[Guest]

Hello
I'd like to clear a picturebox
I used
pictureBox1->Image=NULL;
but I obtained
NULL undeclared identifier
please, what is the problem?

 

[Jochen Kalmbach [MVP]]

Hi tlemcenvisit!

I'd like to clear a picturebox
I used
pictureBox1->Image=NULL;
but I obtained
NULL undeclared identifier
please, what is the problem?

#include <windows.h>

But if this is managed-C++ you should just use "0".

For VC2005 you can also use "null".

--
Greetings
Jochen

My blog about Win32 and .NET
http://blog.kalmbachnet.de/

 

[Guest]

I'm in VC++2005 (managed C++) and I used 'null' , then I obtained the same
think 'null undeclared identifier' and when I used '0' I obtained 'cannot
convert from 'int' to 'System:rawing::Image ^''
Please, what is the problem?

 

[Carl Daniel [VC++ MVP]]

I'm in VC++2005 (managed C++) and I used 'null' , then I obtained the
same think 'null undeclared identifier' and when I used '0' I
obtained 'cannot convert from 'int' to 'System:rawing::Image ^''
Please, what is the problem?

use nullptr instead of null (which is the C# keyword).

-cd

 

[Tamas Demjen]

In VC++2005 you should use 'nullptr'.

Tom

 

[Jochen Kalmbach [MVP]]

Hi Carl!

use nullptr instead of null (which is the C# keyword).

Yes, sorry... I was forgot "ptr"...

--
Greetings
Jochen

My blog about Win32 and .NET
http://blog.kalmbachnet.de/