|
Windows Messages
Windows passes input to a window procedure in the form of messages. Messages are generated by Windows and by applications. Windows generates a
message at each input event  for example, when the user types, moves the mouse, or clicks a control such
as a scroll bar. Windows also generates messages in response to changes in the
system brought about by an application, such as when an application changes the
pool of system font resources or resizes one of its windows. An application can
generate messages to direct its own windows to perform tasks or to communicate
with windows in other applications.
Windows sends a message to a window procedure with a set of four parameters: a
window handle, a message identifier, and two 32-bit values called message parameters. The window handle identifies the window for which the message is intended. Windows uses it to
determine which window procedure to send the message to.
A message identifier is a named constant that identifies the purpose of a message. When a window
procedure receives a message, it uses a message identifier to determine how to
process the message. For example, the message identifier WM_PAINT tells the window procedure that the window's client area has changed and must
be repainted.
Message parameters specify data or the location of data used by a window
procedure when processing a message. The meaning and value of the message parameters
depend on the message. A message parameter can contain an integer, packed bit
flags, a pointer to a structure containing additional data, and so on. When a
message does not use message parameters, they are typically set to NULL. A
window procedure must check the message identifier to determine how to interpret the
message parameters.
| Last news from Greatis Software |
 |
|
Nostalgia .Net |
|
.Net is powerful, but not all-powerful, so sometimes we need to use Win32 API for our .Net applications. It's simple enough with Platform Invoke if you have Win32 skill, but we do not always have time to dig the ancient documentation, declare the special types that are compatible with Win32, find the values of the Win32's constants and so on. Nostalgia .Net offers several simple-to-use classes, and components that will allow you to forget about the headache of Win32 and just use the power of Win32 in your application the same way as you use the native. Net classes. More » |
| Recommended software for developers |
 |
|
Ultimate Pack |
|
Component pack for Delphi and C++ Builder that contains runtime form designer, runtime object inspector, print suite and much more for the very special price. More » |
 |
|
Form Designer .Net |
|
Unique runtime form design solution that allows to edit any form in .Net WinForms application at runtime with full source codes for only 300 euro! More » |
 |
|
Print Suite .Net |
|
Print Suite .Net is a set of components for easy printing texts, images and grids from your WinForms applications. Full C# source codes are available More » |
 |
|
Gradient Controls .Net |
|
Gradient Controls .Net offers controls with gradient background feature. Labels, panels and so on... Full C# source codes are available More » |
 |
|
Greatis iGrid |
|
iGrid plots drawing grid right over your desktop, so you can use it everywhere, with any drawing application without any special plugins for different graphic editors. More » |
All the contacts and projectsDmitry Vasiliev (just.dmitry)
Related LinksSoftware for Visual Studio .NET developers
Software for Delphi and C++ Builder developers
Software for Visual Basic 6 developers
Delphi Tips&Tricks
MegaDetailed.NET More Online Helps Win32 Programmer's Reference
Win32 Multimedia Programmer's Reference
OLE Programmer's Reference
Microsoft Windows Pen API Programmer's Reference
Microsoft Windows Sockets 2 Reference
Microsoft Windows Telephony API (TAPI) Programmer's Reference
Unix Manual Pages
|
