PvtDlg.exe Demonstrates Using Private Dialog-Box Class (83365)

SUMMARY

Pvtdlg.exe is a file in the Microsoft Download Center that demonstrates using a private dialog-box class in an application. The PVTDLG application demonstrates using a private dialog-box class by itself and in conjunction with another dialog box procedure. PVTDLG registers a private dialog-box class that specifies a number of additional window extra bytes. The sample stores the colors to paint each window in the allocated space.

MORE INFORMATION

The following file is available for download from the Microsoft Download Center:

Pvtdlg.exe

For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to Obtain Microsoft Support Files from Online Services

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A private dialog-box class is a technique that allows one callback procedure to process messages that are common to several different dialog boxes. The private dialog-box class encapsulates code that would otherwise be repeated in each dialog procedure.

When Windows has a message for a dialog box that is a member of a private dialog-box class, it calls the private dialog-box class procedure. After the private dialog-box class procedure completes its processing, it must call the DefDlgProc function.

The next step depends on the contents of the lpDialogFunc parameter in the application's call to the CreateDialog or DialogBox functions. If lpDialogFunc is NULL, the DefDlgProc function performs its default processing for the message and processing of that message is complete. If lpDialogFunc is not NULL, DefDlgProc calls the specified procedure. If the dialog box procedure returns FALSE, DefDlgProc performs its default processing for the message. If the dialog box procedure returns any other value, DefDlgProc skips the default processing and returns.