|Date:||November 25, 2003 / year-entry #141|
|Summary:||Once upon a time, Windows was 16-bit. Each message could carry with it two pieces of data, called WPARAM and LPARAM. The first one was a 16-bit value ("word"), so it was called W. The second one was a 32-bit value ("long"), so it was called L. You used the W parameter to pass things...|
Once upon a time, Windows was 16-bit. Each message could carry with it two pieces of data, called
You used the W parameter to pass things like handles and integers. You used the L parameter to pass pointers.
When Windows was converted to 32-bit, the
It is helpful to understand the origin of the terms. If you look at the design of window messages, you will see that if the message takes a pointer, the pointer is usually passed in the
Once you learn this, it makes remembering the parameters for window messages a little easier. Conversely, if a message breaks this rule, then it sort of makes your brain say, "No, that's not right."
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