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Hi,
I'm implementing a function that requires me to specify a int value for a message to be received after the asynchronous function completes..
My question is, what range of values should a user defined message be in? Obviously, I don't want to specify a value that is already used by a Win32 windows message.
Any help would be appreciated..
Dan
For user messages, they must have values between 0x8000 and 0xBFFF to guarantee that they do not conflict with any system messages.
You can specify a user message like this:
Code:#define MY_MESSAGE WM_USER + 1
#define MY_MESSAGE_2 WM_USER + 2
WM_USER is also used by the other classes - only the range I gave is actually unused. MS says:
Code:0 through WM_USER – 1 Messages reserved for use by the system.
WM_USER through 0x7FFF Integer messages for use by private window classes.
WM_APP through 0xBFFF Messages available for use by applications.
0xC000 through 0xFFFF String messages for use by applications.
Greater than 0xFFFF Reserved by the system for future use.