DataVal.exe Demonstrates Edit Control Validation

ID: Q82076

The information in this article applies to:

Microsoft Windows Software Development Kit (SDK) versions 3.0, 3.1

SUMMARY

DataVal.exe is a file in the Microsoft Software Library that demonstrates how to validate the contents of one or more edit controls within the same dialog box without subclassing the edit controls.

MORE INFORMATION

The following files are available for download from the Microsoft Download Center. Click the file names below to download the files:

DataVal.exe

For more information about how to download files from the Microsoft Download Center, please visit the Download Center at the following Web address

http://www.microsoft.com/downloads/search.asp

and then click How to use the Microsoft Download Center.

DATAVAL processes the EN_KILLFOCUS message, which the dialog box receives after an edit control has lost the input focus. When the dialog box receives an EN_KILLFOCUS message, it calls a validation function to determine if the contents of the control losing focus is valid. If the contents is not valid, then the dialog box posts a user- defined "not valid" message to itself. When the dialog box processes the "not valid" message, it displays a message box alerting the user of the error, and then sets focus back to the control with invalid contents. A cancel button in the dialog box allows the user to exit the dialog box without performing validation.

An application is in an unstable state when it receives an EN_KILLFOCUS message; Windows is in the process of switching focus between windows. Therefore, the application must use PostMessage to provide the "not valid" message or the application can enter an infinite loop.

Additional query words:

Keywords : kbfile kbsample kb16bitonly kbCtrl kbEditCtrl kbSDKPlatform kbGrpUser kbWinOS310 kbWinOS300
Version : WINDOWS:3.0,3.1
Platform : WINDOWS
Issue type :