Автор: This situation is really so prevalent discover a purpose entitled PostQuitMessage so you’re able to article WM_End. PostMessage usually increases results when you wish to imitate a demand or enter in event because of the publish WM_Command otherwise one of many cello otherwise mouse texts (that’s always dicey, by the way). So it is true as «real» enter in incidents constantly are in sequences away from relevant messages (for example keydown/keyup sets) and your software might get befuddled if you attempt in order to process an alternative enter in content in the center of one of them sequences. Post works more effectively when simulating https://gorgeousbrides.net/no/varme-og-sexy-britiske-jenter/ type in. Possibly you have to use PostMessage to locate around good quirk or insect to stop unlimited recursion. Such, suppose their WM_SETFOCUS handler (OnSetFocus) find that the newest attention window is not best for specific need and you’ve got adjust the main focus to some other window.
For those who telephone call SetFocus from inside the OnSetFocus handler, Windows instantly sends various other WM_SETFOCUS messagea€»while you’re nevertheless control the first that!
As a result, infinite regress until their heap blows upwards. To end it infelicity, you could blog post a message to help you yourselfa€»MYWM_SWITCHFOCUSa€»thus OnSetFocus normally find yourself before you can processes the message to evolve the main focus. This can be one of those instances that is better to know for the practice than just on paper. The crucial thing to remember would be the fact Screen won’t enable you to SetFocus inside an excellent WM_SETFOCUS handler. Just like the SendMessage calls the latest windows proc physically, it will require an enthusiastic HWND. How else does it know and this content proc to name? However, PostMessage adds the message on message queue, that’s on the a bond otherwise process, maybe not a windows.
// blog post content to help you mePostMessage(NULL, WM_HI_THERE_Good looking, . );
That is, they attempts to become sweet giving for every software a spin to die gracefully, in case a software will not function with time, ExitWindowsEx kills this new app in any event
In the event your HWND is actually NULL, PostMessage postings the message to the current running thread’s content waiting line. Used, this particular aspect is not terribly useful since most moments we should article a contact to another bond (possibly which have PostThreadMessage); but discover constantly unusual activities when it’s smoother to post to help you your self instead a window. (If you think of any, delight tell me.) Should you believe you may be begin to know when you should explore SendMessage and you will PostMessage, there are around three way more content-delivering characteristics you need to know from the: SendMessageCallback, SendNotifyMessage, and you will SendMessageTimeout. Such properties are helpful regarding the heady arena of Win32A® and multithreading. In the Win32, for individuals who name SendMessage your own thread is actually banned through to the target thread process the message. Whether your target thread is alone banned for some other need, SendMessage never production. Oops. SendNotifyMessage, SendMessageTimeout, and SendMessageCallback was indeed devised to operate surrounding this disease. SendNotifyMessage work such as for example SendMessage if your target screen falls under (was created by) the present day thread; it works such as PostMessage if the windows falls under an alternative thread. SendMessageTimeout is comparable, nonetheless it allows you to specify a maximum time for you to wait for others thread to react. As well bad, very unfortunate. SendMessageTimeout waits, although not forever. As you you will imagine, SendMessageCallback requires an excellent callback means. It directs the message and productivity instantaneously; when the message has been canned, Windows calls the setting. SendMessageCallback will come in handy whenever you may like to fool around with PostMessage, however you would like to know in the event the content has been handled. Look at it as PostMessage having a profit acknowledgment. PostMessage, SendMessageTimeout, and you will SendNotifyMessage are all a good candidates to use if you’d like so you can transmitted an email to all or any most useful-top window that with HWND_TOPMOST as HWND. It’s a bad idea to utilize HWND_TOPMOST which have SendMessage due to the fact one dead procedure can bring their software in order to a halt. Profile dos sumong the many content-sending functions. Whew!
