How to add a hotkey to c++ application.

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C++

Hi,

Can someone please tell me how to add a hotkey to your c++ api application.

Thanks.

Posted 6-Mar-11 7:05am

Dark_Coder

Updated 14-Mar-11 23:48pm

Dalek Dave

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LloydA111 6-Mar-11 13:20pm

To "your" application? I think you have posted this in the wrong place.

Sergey Alexandrovich Kryukov 6-Mar-11 13:53pm

It must be grammar mistake.
However, there is no question here, it depends in UI library used.
--SA

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User 7429338 · Accepted Answer · 2011-03-14T23:12:00

This is a simple example which opens notepad.exe if you press ctrl+shift+o.

hotkey.cpp:

#include <windows.h>
#include <shellapi.h>
#include "resource.h"

LRESULT CALLBACK MainWndProc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam)
{
	switch(msg){
		case WM_COMMAND:
			switch(LOWORD(wParam)){
				case ID_OPENNOTEPAD:
				ShellExecute(0,0,"notepad.exe",0,0,SW_SHOW);
				break;
			}break;
		case WM_DESTROY:
			PostQuitMessage(0);
			break;
		default:
			return DefWindowProc(hwnd,msg,wParam,lParam);
	}return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, INT nCmdShow)
{
	WNDCLASS wc = {0};
	wc.lpfnWndProc = (WNDPROC)MainWndProc;
	wc.hInstance = GetModuleHandle(0);
	wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
	wc.lpszClassName = "hotkeyWndClass";
	wc.hCursor = LoadCursor(0,IDC_ARROW);
	RegisterClass(&wc);

	ShowWindow(CreateWindow("hotkeyWndClass","hotkey",WS_CAPTION|WS_SYSMENU,CW_USEDEFAULT,0,CW_USEDEFAULT,0,0,0,hInstance,0),SW_SHOW);

	MSG msg;
	HANDLE hAccelTable = LoadAccelerators(hInstance,MAKEINTRESOURCE(IDACCEL));
	while(GetMessage(&msg,0,0,0))
		if(!TranslateAccelerator(msg.hwnd,hAccelTable,&msg)){
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	return 0;
}

resource.h:

#define ID_OPENNOTEPAD	101
#define IDACCEL		10000

resource.rc:

#include <windows.h>
#include "resource.h"

IDACCEL ACCELERATORS
BEGIN
	"O",	ID_OPENNOTEPAD,VIRTKEY,CONTROL, SHIFT
END

User 7429338 · Accepted Answer · 2011-03-06T08:18:00

In your resource script (.rc file) you'll add your accelerator, something like this:

IDACCEL ACCELERATORS DISCARDABLE 
BEGIN
    "O",            ID_OPEN,                VIRTKEY, CONTROL, NOINVERT
    "S",            ID_SAVE,                VIRTKEY, CONTROL, NOINVERT
END

Then in your WinMain function where your GetMessage loop is, add the following:

MSG msg;
HACCEL hAccelTable = LoadAccelerators(hInstance,MAKEINTRESOURCE(IDACCEL));

while(GetMessage(&msg,0,0,0))
    if(!TranslateAccelerator(hwndMain,hAccelTable,&msg)){
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

Then in the function where you handle hwndMain's messages, you'll get your accelerator notification as WM_COMMAND message. LOWORD(wParam) will be your identifier (e.g. ID_OPEN, ID_SAVE).

How to add a hotkey to c++ application.

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