I'm trying to retrieve a handle to the window to
update it with the following call in the callback
procedure for my dialog box :

case WM_INITDIALOG:
hCtrlBlock = GetDlgItem (hDlg, IDC_PAINT) ;

But get the following error :

error C2065: 'IDC_PAINT' : undeclared identifier

I thought IDC_PAINT is a part of the API. Would
anyone know what I'm doing wrong?

: error C2065: 'IDC_PAINT' : undeclared identifier
:
: I thought IDC_PAINT is a part of the API. Would
: anyone know what I'm doing wrong?
The GetDlgItem function retrieves the handle of a control in the specified dialog box.
Which control of your dialogbox (in the resource section) defined as IDC_PAINT?

#define IDC_PAINT ???

: : error C2065: 'IDC_PAINT' : undeclared identifier
: :
: : I thought IDC_PAINT is a part of the API. Would
: : anyone know what I'm doing wrong?
: The GetDlgItem function retrieves the handle of a control in the specified dialog box.
: Which control of your dialogbox (in the resource section) defined as IDC_PAINT?

#define IDC_PAINT ???

:

Okay, I see. Would you know what function I can call to retrieve
the handle to the overall window?

: : : error C2065: 'IDC_PAINT' : undeclared identifier
: : :
: : : I thought IDC_PAINT is a part of the API. Would
: : : anyone know what I'm doing wrong?
: : The GetDlgItem function retrieves the handle of a control in the specified dialog box.
: : Which control of your dialogbox (in the resource section) defined as IDC_PAINT?

#define IDC_PAINT ???

: :
:
: Okay, I see. Would you know what function I can call to retrieve
: the handle to the overall window?
:
:
I suspect you are doing the wrong things... can you tell me what exactly is the purpose of getting the dialog item? If you want to draw on it - this is completely diferent and you do not need this function at all - you need to reply to WM_RAWITEM message.

Add this line after the other #include statements:

#include "resource.h"