VC control -- use the spin control to increase or decrease characters

Response Message of udn_deltapos

 

Message udn_deltapos of the rotating button control

Indicates that the widget location will change.

 

The udn_deltapos message of the reload spin control will have the following functions:

 

Void ctestdlg: ondeltaposspin3 (nmhdr * pnmhdr, lresult * presult)

{

Nm_updown * pnmupdown = (nm_updown *) pnmhdr;

If (pnmupdown-> idelta = 1) // if this value is 1, the spin arrow is clicked.

{

// Process the characters. For example, convert "A" to "B"

}

Else if (pnmupdown-> idelta =-1) // if this value is-1, it means you have clicked the up arrow of spin.

{

// Process the characters. For example, convert "B" to ""

}

 

* Presult = 0;

}

 

Detailed practices:

 

1: assume that the edit box is idc_edit and the spin button is idc_spin.

2: Ctrl + W, Enter Class Wizard, select idc_spin in the object IDs column, select udn_deltapos in the messages column, and click "add function. the "ondeltaposspin" dialog box is displayed. Click OK to add this function. click "edit code" to enter the newly added function.

3: A new function will be added.

Void ctestdlg: ondeltaposspin (nmhdr * pnmhdr, lresult * presult )...

4: Add the following code:

 

Void ctestdlg: ondeltaposspin (nmhdr * pnmhdr, lresult * presult)

{

Nm_updown * pnmupdown = (nm_updown *) pnmhdr;

 

Cwnd * pwnd = (cwnd *) getdlgitem (idc_edit); // get the window pointer pointing to the edit box.

Cstring strvalue;

Pwnd-> getwindowtext (strvalue); // get the content in the edit box.

 

If (pnmupdown-> idelta = 1) // if you click the up button in spin

{

If (! Strvalue. isempty ())

{

Strvalue. setat (0, strvalue [0] + 1); // Add 1 to the first letter of the edit box

Pwnd-> setwindowtext (strvalue); // Save the modification

}

}

Else if (pnmupdown-> idelta =-1) // if you click the down button in spin

{

If (! Strvalue. isempty ())

{

Strvalue. setat (0, strvalue [0]-1); // The first letter of the edit box minus 1.

Pwnd-> setwindowtext (strvalue); // Save the modification

}

}

* Presult = 0;

}

 

After using the above method, I encountered a problem: when I keep holding up or down, I will not increase after increasing 16. Later I found that I can change the condition to be greater than 0 or less than 0, greater than 0 indicates the up button