The event message routine has the following format.
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 occur.
In [Class View], right-click on the class to which you want to add an event message routine.
Then select [Add]-[Add Function]. The [Add Member Function Wizard] dialog is displayed.
Create the function according to the following procedure.
|
[Return type] |
LRESULT |
|
[Function name] |
DefWindowProc |
|
[Parameter type] |
UINT |
|
[Parameter name] |
message |
|
[Add] |
Click |
|
[Parameter type] |
WPARAM |
|
[Parameter name] |
wParam |
|
[Add] |
Click |
|
[Parameter type] |
LPARAM |
|
[Parameter name] |
lParam |
|
[Add] |
Click |
|
[Access] |
protected |
|
[Virtual] |
Check the checkbox |
Click the [Finish] button after confirming that Function signature is as follows.
virtual LRESULT DefWindowProc(UINT message, WPARAM wParam, LPARAM lParam);
{
Description of processing
}
return CDialog::DefWindowProc(message, wParam, lParam);
If there is no problem of the description, an event message routine has been created.
To use event, it is necessary to set the window handle of application to driver.
Use the following functions to set event.
Analog Input |
AioSetAiEvent |
Analog Output |
AioSetAoEvent |
Counter |
AioSetCntEvent |
|
Timer |
AioSetTmEvent |
Specify the window handle to parameter hWnd by these event setting functions.
In Visual C++ (MFC), member variable m_hWnd in MFC class is the window handle, so please specify this member variable to the parameter.
Ret = AioSetAiEvent ( Id , m_hWnd , AiEvent )
Ret = AioSetAoEvent ( Id , m_hWnd , AoEvent )
Ret = AioSetCntEvent ( Id , CntChannel , m_hWnd , CntEvent )
Ret = AioSetTmEvent ( Id , TimerId , m_hWnd , TmEvent )