Sometimes if either the desktop crashes or windows decides to go wrong for whatever reason, it re-creates the system tray. There is no way to detect when that happens and your icon is now missing but your system tray application is still running.<\/p>\n
Windows does send a windows message to be notified when the system tray is being created. \u00a0It won’t be sent to you unless you register to receive\u00a0it.<\/p>\n
To register to receive the message do the following and store the ID that is returned. The simplest way to do this is to store it in a global variable.<\/p>\n
const int uTaskbarCreatedMsg = RegisterWindowMessageA(\"TaskbarCreated\");\r\n\r\n<\/pre>\nThen later on in your windows message loop handle the message.<\/p>\n
LRESULT CALLBACK WndProc(HWND w, UINT msg, WPARAM wparam, LPARAM lparam)\r\n{\r\n \/\/ ... handle other messages\r\n if (msg == uTaskbarCreatedMsg) {\r\n \/\/ Destroy any existing icon and recreate it\r\n CreateSystemTrayIcon();\r\n return 0;\r\n }\r\n \/\/ ... default message handling\r\n}\r\n\r\n<\/pre>\n<\/p>\n
Related Links<\/h1>\n
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- System Tray SDK<\/a><\/li>\n
- MSDN RegisterWindowMessage API<\/a><\/li>\n<\/ul>\n
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The Problem: Sometimes if either the desktop crashes or windows decides to go wrong for whatever reason, it re-creates the system tray. There is no way to detect when that happens and your icon is now missing but your system tray application is still running. The Solution: Windows does send a windows message to be … Continue reading How to detect if your system tray icon has gone missing, C\/C++, Win32<\/span>