Library tutorials & articles
Subclassing
By James Crowley, published on 14 Jul 2001
James first started this website when learning Visual Basic back in 1999 whilst studying his GCSEs. The site grew steadily over the years while being run as a hobby - to a regular monthly audience ...
James first started this website when learning Visual Basic back in 1999 whilst studying his GCSEs. The site grew steadily over the years while being run as a hobby - to a regular monthly audience ...
Other Messages
Below is a list of some of the other messages you can catch when subclassing, and when they occur. For the constant declarations, use the API Viewer. Take a look at the SDK documentation in MSDN for extensive definitions and what is actually passed in the lParam and wParam parameters (these vary from message to message)
| Message | Occurs... |
| WM_MOVE | when the form is moved |
| WM_NCLBUTTONDOWN | when the left mouse button is pressed on the title bar |
| WM_NCLBUTTONUP | when the left mouse button is raised off the title bar |
| WM_NCLBUTTONDBLCLK | when the left mouse button is double clicked on the title bar |
| WM_NCRBUTTONDOWN | when the right mouse button is pressed on the title bar |
| WM_NCRBUTTONUP | when the right mouse button is raised off the title bar |
| WM_NCRBUTTONDBLCLK | when the right mouse button is double clicked on the title bar |
| WM_NCMOUSEMOVE | when the mouse is moved over the titlebar |
| WM_NCACTIVATE | when the title bar is activated |
| WM_ACTIVATE | when the form is activated |
| WM_EXITSIZEMOVE | when the mouse is released after moving the form |
| WM_VSCROLL | when the textbox is scrolled vertically |
| WM_HSCROLL | when the textbox is scrolled horizontally |
| WM_MENUSELECT | when a menu is moved over by the mouse. |
| WM_PAINT | when the form is redrawn |
| WM_GETMINMAXINFO | when windows requests the minimum and maximum form sizes |
| WM_NOTIFY | when a control on the form is sent a message |
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Pretty hacky functions... Try these:
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Those will chop off the 1st/2nd and 3rd/4th bytes respectively using pure math. Much faster and more universal.
Hummmm..... This code looks surprisingly like the code in the GETMINMAXINFO example at http://www.mvps.org/vbvision/ Right down to the exact same comments! Coincidence? You be the judge!
http://www.vbaccelerator.com/home/VB/Code/Libraries/Subclassing/SSubTimer/article.asp
the link Download the SSubTmr project code (no DLL) (9kb) not working.
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