Need help with HANDLE_MSG

Question

0.00/5 (No votes)

See more:

Visual C++

I am trying to set up a hot key of "F1" to call a routine within my software. I have been able to register the hot key but can not get the code to compile to try to take action when the hot key is pressed. I don't know how to handle WM_HOTKEY.

Code:

C++

include windowsx.h

//this seems to be working.  if I call it a 2nd time it fails
if(!RegisterHotKey(NULL, IDC_OP_START, 0, 0x70)) MessageBox("F1 Register Failed");

WPARAM wParam;
LPARAM lParam;
HANDLE_MSG(NULL, WM_HOTKEY, OnStartTest)

void COpui::OnStartTest()
{
//my routine in here
}

ERROR!!
error C2046: illegal case
error 'HANDLE_WM_HOTKEY' : undeclared identifier

Seems like the HANDLE_MSG function does not like me passing WM_HOTKEY.

Posted 30-Nov-12 10:29am

denso1

Updated 30-Nov-12 10:56am

ZurdoDev

v2

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Richard MacCutchan · Answer 1 · 2012-12-01T00:53:00

Solution 2

I think you need to spend some time learning about Windows programming before trying such advanced topics as this. You cannot just dump a case statement in the middle of your code and expect it to do something. The HANDLE_MSG macro is designed to be used inside a switch {} block in the windows message handler function of your program.

Posted 1-Dec-12 0:53am

Richard MacCutchan

Comments

Albert Holguin 1-Dec-12 22:34pm

I agree... learn to do the windows message handling and you'll understand this much better... +5 Richard

Sergey Alexandrovich Kryukov · Answer 2 · 2012-11-30T11:01:00

You are not showing source code which causes this problem. The identifier HANDLE_WM_HOTKEY, is not found, but the source code you show uses WM_HOTKEY which will be compiled with "windows.h":
http://msdn.microsoft.com/en-us/library/windows/desktop/ms646279%28v=vs.85%29.aspx[^].

Compare: http://support.microsoft.com/kb/83456[^]. HANDLE_MSG is the macro used to implement window procedure (in a lame C++ way, in my opinion :-)):
http://msdn.microsoft.com/en-us/library/windows/desktop/ff468931%28v=vs.85%29.aspx[^],
http://msdn.microsoft.com/en-us/library/windows/desktop/ms632593%28v=vs.85%29.aspx[^].

[EDIT]

In response to the follow-up question: yes, this token-pasting '##' operator you never mentioned before. It is explained here:
http://msdn.microsoft.com/en-us/library/09dwwt6y%28v=vs.110%29.aspx[^].

All this preprocessor activity and this way of message handling is such a lame! Can I unsee it? :-)

—SA