C++ event handling for click on notification area Icon Windows - c++

Question

I want to achieve some kind of event handling for Windows. I have a program, that has a symbol in the Notification Area (System Tray) and I want the programm to show up again, when the user clicks on the Icon. Is there a simple Way to implement that in c++ as an Event? I have only found ways to this in C#.
It is a console Application and I want to change as few things as possible. But there is no WndProc handler for Console Application as far as I can tell.

Answer 1

Why no WndProc? Console application is a perfect win32 application, and it can use anything which non-console application can use.
Here's a simple, but a bit long example.
#include <windows.h>
#include <shellapi.h>
#include <iostream>
#include <cstring>
LRESULT CALLBACK WndProc(HWND hWnd, UINT iMsg, WPARAM wParam, LPARAM lParam);
BOOL WINAPI ConsoleRoutine(DWORD dwCtrlType);
LPCWSTR lpszClass = L"__hidden__";
int main()
{
HINSTANCE hInstance = GetModuleHandle(nullptr);
WNDCLASS wc;
HWND hWnd;
MSG msg;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hbrBackground = nullptr;
wc.hCursor = nullptr;
wc.hIcon = nullptr;
wc.hInstance = hInstance;
wc.lpfnWndProc = WndProc;
wc.lpszClassName = lpszClass;
wc.lpszMenuName = nullptr;
wc.style = 0;
RegisterClass(&wc);
hWnd = CreateWindow(lpszClass, lpszClass, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
nullptr, nullptr, hInstance, nullptr);
while (GetMessage(&msg, nullptr, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return static_cast<int>(msg.wParam);
}
LRESULT CALLBACK WndProc(HWND hWnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
static NOTIFYICONDATA nid;
switch (iMsg)
{
case WM_CREATE:
std::memset(&nid, 0, sizeof(nid));
nid.cbSize = sizeof(nid);
nid.hWnd = hWnd;
nid.uID = 0;
nid.uFlags = NIF_ICON | NIF_MESSAGE | NIF_TIP;
nid.uCallbackMessage = WM_APP + 1;
nid.hIcon = LoadIcon(nullptr, IDI_APPLICATION);
lstrcpy(nid.szTip, L"con-notify");
Shell_NotifyIcon(NIM_ADD, &nid);
Shell_NotifyIcon(NIM_SETVERSION, &nid);
return 0;
case WM_APP + 1:
switch (lParam)
{
case WM_LBUTTONDBLCLK:
std::cout << "notify dblclk" << std::endl;
break;
case WM_RBUTTONDOWN:
case WM_CONTEXTMENU:
break;
}
break;
case WM_DESTROY:
Shell_NotifyIcon(NIM_DELETE, &nid);
MessageBox(nullptr, L"asdf", L"asdf", MB_OK);
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hWnd,iMsg,wParam,lParam);
}
You probably want not to mess up your console program with message loop. If so, you can put notification code into another thread.