Visual C++ (MFC)

It is a method of using the event message routine as a function of Visual C++.
When using DefWindowProc, the event message routine is called whenever all events related to the application are generated.

Creating event message routine

In Class View, right-click on the class to which you want to add the event message routine.
Then choose Add-Add Function. The Add Member Function Wizard dialog box is displayed.
Create the function according to the following procedure.

Return type	LRESULT
Function name	DefWindowProc
Parameter list	UINT
Parameter name	message
Add	Click the button
Parameter list	WPARAM
Parameter name	wParam
Add	Click the button
Parameter list	LPARAM
Parameter name	lParam
Add	Click the button
Access	protected
Virtual	Cleck the check box

Click the Finish button after confirming that Function signature is as follows.

virtual LRESULT DefWindowProc(UINT message, WPARAM wParam, LPARAM lParam);

Specifying Window Handle

To use events, it is necessary to set the window handle of the application to the driver.
Use the following functions for event setting.

Count Match Notification	CntNotifyCountUp
Counter Error Notifiction	CntNotifyCounterError
Carry/Borrow Notification	CntNotifyCarryBorrow
Timer Notification	CntNotifyTimer
Sampling Stop Notification	CntNotifySamplingStop
Specified Time Sampling Completion	CntNotifySamplingCount

Specify the window handle to the hWnd parameter in these event setting functions.
The m_hWnd member variable in MFC class contains the window handle In Visual C++ .NET. Please specify the member variable "as is".

Ret = CntNotifyCountUp ( Id , 0 , 0 , 10000 , m_hWnd );

Ret = CntNotifyCounterError ( Id , m_hWnd );

Ret = CntNotifyCarryBorrow ( Id , m_hWnd );

Ret = CntNotifyTimer ( Id , 100 , m_hWnd );

Ret = CntNotifySamplingStop ( Id , m_hWnd );

Ret = CntNotifySamplingCount ( Id , m_hWnd );