Note:
The following uses a self-created dialog box class (mymessagedlg) to view (messagetestview)
Sending a custom message is used as an example to describe
Summary:
Method 1: Use on_message
When on_message is used to respond to a message, the message must be defined together with # define wm_my_message (wm_user + 100)
for the sender-mymessagedlg,
In its mymessagedlg. in H, define # define wm_my_message (wm_user + 100)
In its mymessagedlg. in CPP, add: # include "mainfrm. H "
because cmainframe * is used to define an object.
function with Test message:
void mymessagedlg: onbuttonmsg ()
{< BR class = ""> // todo: add your control notification handler code here
cmainframe * PMF = (cmainframe *) afxgetapp ()-> m_pmainwnd; // obtain the current framework pointer
cview * active = PMF-> getactiveview (); // you can obtain the current video class pointer
If (active! = NULL) // get the current class pointer to send messages
active-> postmessage (wm_my_message ); // use postmessage to send a message
} for the message receiver-messagetestview,
In its messagetestview. in H, define # define wm_my_message (wm_user + 100)
and define the message ing function-onmymessage ()
protected:
// {afx_msg (cmessagetestview)
afx_msg lresult onmymessage (wparam, lparam );
//}} afx_msg
declare_message_map ()
In its messagetestview. in CPP,
declare the response Information:
begin_message_map (cmessagetestview, ceditview)
// {afx_msg_map (cmessagetestview)
on_message (wm_my_message, onmymessage)
///} afx_msg_map
Add a message response function implementation:
lresult cmessagetestview: onmymessage (wparam, lparam)
{< BR class = "> MessageBox (" onmymessage! ");
return 0;
}
Method 2: Use on_registered_message
on_registered_message to register a message, must be used with
static uint wm_my_message = registerwindowmessage ("message"); For the message sender-mymessagedlg,
In its mymessagedlg. H, as long
Define static uint wm_my_message = registerwindowmessage ("message ");
You can.
In mymessagedlg. cpp, add: # include "mainfrm. H"
Because cmainframe * is used to define objects.
Function for testing messages:
Void mymessagedlg: onbuttonmsg ()
{
// Todo: add your control notification handler code here
Cmainframe * PMF = (cmainframe *) afxgetapp ()-> m_pmainwnd; // first obtain the current frame pointer
Cview * active = PMF-> getactiveview (); // you can obtain the current video class pointer.
If (active! = NULL) // get the current class pointer to send messages
Active-> postmessage (wm_my_message,); // use postmessage to send messages
} For the Message Receiver-messagetestview,
Do not define in its messagetestview. h
Static uint wm_my_message = registerwindowmessage ("message ");
Put this definition in messagetestview. cpp. Do not see: redefinition
In its messagetestview. H, you only need to define the message ing function.
Protected:
// {Afx_msg (cmessagetestview)
Afx_msg lresult onmymessage (wparam, lparam );
//} Afx_msg
Declare_message_map ()
In its messagetestview. cpp, define
Static uint wm_my_message = registerwindowmessage ("message ");
Then register the message:
Begin_message_map (cmessagetestview, ceditview)
// {Afx_msg_map (cmessagetestview)
On_registered_message (wm_my_message, onmymessage)
//} Afx_msg_map
Finally, add the message response function implementation:
Lresult cmessagetestview: onmymessage (wparam, lparam)
{
MessageBox ("onmymessage! ");
Return 0;
}
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The two methods are compared, but they are slightly different. However, be cautious to avoid the possibility that messages cannot be received. ------------------------------------------------------------------- Other considerations: Before sending the message-mymessagedlg. cpp, define
Static uint wm_my_message = registerwindowmessage ("message "); The message-messagetestview. cpp must be defined before receiving the message.
Static uint wm_my_message = registerwindowmessage ("message "); The content of "" In registerwindowmessage ("message") is not important. You can write anything. It is mandatory.
The sender and receiver are the same content, for example: "message" |
