Knowledge Base

BUG: ChooseColor Dialog Box Quits When Edit Control Subclassed

Article ID: 141202

Article Last Modified on 5/14/2004

Microsoft Win32 Application Programming Interface, when used with:
- Microsoft Windows NT Server 3.51
- Microsoft Windows NT Workstation 3.51

This article was previously published under Q141202

SYMPTOMS

When the ChooseColor() API is called to display the custom color selection dialog box in an application that is globally subclassing edit controls, an application error (The memory could not be read) occurs in the application.

CAUSE

Certain messages are sent to this dialog before WM_INITDIALOG. These messages manipulate the dialog's edit controls. However, these messages assume the standard system edit control and act accordingly, thus causing the problem.

RESOLUTION

To avoid this error, applications that use a global customized edit control should use a superclassed edit control.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

Keywords: KB141202