July 12, 2023

The brand new Screen function ExitWindowsEx spends SendMessageTimeout to transmit WM_QUERYENDSESSION to any or all most readily useful-top programs

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This example can be so prevalent there is certainly a work called PostQuitMessage to help you post WM_End. PostMessage constantly increases results when you wish to simulate a demand otherwise input enjoy by posting WM_Demand or one of the keyboard or mouse texts (that's always dicey, by-the-way). So it holds true since the "real" input events constantly have been in sequences off associated texts (such as keydown/keyup pairs) and your app might get befuddled if you attempt so you're able to processes a different input message in the center of one among these sequences. Post works better when simulating input. Sometimes you have got to play with PostMessage discover doing an excellent quirk or insect to cease unlimited recursion. Like, guess your own WM_SETFOCUS handler (OnSetFocus) determines the this new attention windows isn’t best for some reason along with to improve the focus to another window.

For many who call SetFocus from inside your OnSetFocus handler, Windows instantaneously sends various other WM_SETFOCUS messagea€"when you are however operating the original you to!

As a result, unlimited regress up until the pile punches right up. To cease this infelicity, you might article a contact so you're able to yourselfa€"MYWM_SWITCHFOCUSa€"so OnSetFocus can become before you techniques the content to evolve the main focus. This is exactly those types of examples that's simpler to learn within the behavior than in writing. It is essential to consider would be the fact Window would not enable you to SetFocus within this a good WM_SETFOCUS handler. Once the SendMessage calls the latest windows proc myself, it will require an enthusiastic HWND. Exactly how more will it understand which content proc to-name? However, PostMessage adds the message towards content queue, that is from the a bond or process, perhaps not a window.

// blog post content in order to me 
PostMessage(NULL, WM_HI_THERE_Good-looking, . ); 

That's, they attempts to end up being sweet by providing per application a spin so you're able to die gracefully, however if an app doesn't respond soon enough, ExitWindowsEx kills the app anyway

If your HWND are NULL, PostMessage posts the message to the present powering thread's content waiting line. Used, this particular feature isn't defectively useful since the majority moments we want to blog post a message to some other thread (perhaps which have PostThreadMessage); but you'll find usually unusual things if it is convenient to share in order to your self in place of a window. (If you feel of any, delight let me know.) In the event you think you might be beginning to see when to use SendMessage and you can PostMessage, you can find around three far more content-delivering services you have to know throughout the: SendMessageCallback, SendNotifyMessage, and you can SendMessageTimeout. These types of features are of help on heady field of Win32A® and you can multithreading. When you look at the Win32, for people who telephone call SendMessage their bond is actually blocked before address thread procedure the message. In the event the target bond are alone blocked for some other need, SendMessage never ever output. Oops. SendNotifyMessage, SendMessageTimeout, and you will SendMessageCallback was formulated to focus around this disease. SendNotifyMessage works including SendMessage whether your target windows belongs to (was created by the) the modern bond; it truly does work particularly PostMessage whether your window belongs to another bond. SendMessageTimeout is similar, it allows you to establish a max time for you await one other bond to reply. Also crappy, very unfortunate. SendMessageTimeout delays, not permanently. Since you you are going to guess, SendMessageCallback requires an effective callback setting. They directs the content and you can output quickly; if message has been canned, Screen phone calls their mode. SendMessageCallback will come in useful whenever you would want to play with PostMessage, however you want to know in the event that content might have been managed. Think of it as PostMessage which have an income bill. PostMessage, SendMessageTimeout, and SendNotifyMessage are all Jolly Romance jenter kommersiell good people to use if you would like so you're able to shown an email to most readily useful-level screen that with HWND_TOPMOST since the HWND. It is an awful idea to utilize HWND_TOPMOST having SendMessage as the you to deceased techniques may bring your own software so you can a halt. Shape dos sumong the different message-sending functions. Whew!