This case is indeed commonplace there was a purpose titled PostQuitMessage to article WM_Quit. PostMessage always works better if you want in order to imitate a command otherwise type in feel by the post WM_Command or among the many piano or mouse messages (that’s usually dicey, in addition). This is true given that “real” enter in events usually have sequences away from associated texts (for example keydown/keyup pairs) plus software could get befuddled if you attempt in order to processes yet another enter in message in the exact middle of one among these sequences. Post works more effectively whenever simulating type in. Sometimes you have got Asian Melodies tanД±Еџma sitesi incelemesi to fool around with PostMessage to obtain doing an effective quirk otherwise insect to cease unlimited recursion. Instance, imagine your WM_SETFOCUS handler (OnSetFocus) find that new attract windows is not best for particular cause and you have to switch the main focus to another screen.

For individuals who call SetFocus from the inside your own OnSetFocus handler, Screen immediately delivers various other WM_SETFOCUS messagea€”while you are still operating the initial one!

The result is unlimited regress up to the bunch punches right up. To end which infelicity, you could blog post a contact in order to yourselfa€”MYWM_SWITCHFOCUSa€”therefore OnSetFocus is wind up before you could process the content to switch the focus. This can be one particular advice which is more straightforward to discover inside the practice than just written down. The main thing to consider is the fact Window wouldn’t enable you to SetFocus inside good WM_SETFOCUS handler. Once the SendMessage calls the windows proc personally, it entails an HWND. Exactly how else can it discover and that message proc to mention? But PostMessage adds the content into the content waiting line, which is associated with a thread otherwise procedure, perhaps not a windows.

// post content so you can me 
PostMessage(NULL, WM_HI_THERE_Good-looking, . ); 

That’s, it attempts to be sweet by providing for every single app a spin so you can pass away gracefully, in case an application does not respond over time, ExitWindowsEx eliminates this new application in any event

In case your HWND is NULL, PostMessage listings the message to the present powering thread’s message waiting line. Used, this particular aspect isn’t defectively of use since the majority minutes we would like to blog post a contact to some other bond (perhaps with PostThreadMessage); but you’ll find always rare factors when it is much easier to publish to help you your self instead a window. (If you think of any, excite tell me.) Should you imagine you might be beginning to know when to use SendMessage and you will PostMessage, you’ll find around three a lot more message-giving properties you should know throughout the: SendMessageCallback, SendNotifyMessage, and you can SendMessageTimeout. These types of characteristics are of help regarding the heady field of Win32A® and you may multithreading. In the Win32, for those who name SendMessage your own thread try prohibited till the target bond techniques the message. When your address bond try alone blocked for the majority of most other reason, SendMessage never ever production. Oops. SendNotifyMessage, SendMessageTimeout, and you may SendMessageCallback have been created to get results around this problem. SendNotifyMessage performs such as for example SendMessage in case the address windows belongs to (is made by) the present day bond; it truly does work such PostMessage in the event the screen is part of an alternative thread. SendMessageTimeout is similar, nonetheless it enables you to specify an optimum time to expect additional bond to respond. Also bad, thus unfortunate. SendMessageTimeout delays, yet not forever. Since you might assume, SendMessageCallback takes good callback means. They delivers the content and you can production instantly; in the event the message could have been canned, Window calls your form. SendMessageCallback comes in useful whenever you may like to fool around with PostMessage, however you need to know when the content has been addressed. Consider it as PostMessage which have income acknowledgment. PostMessage, SendMessageTimeout, and you may SendNotifyMessage are all good people to make use of if you’d like so you’re able to aired an email to all or any better-top window by using HWND_TOPMOST once the HWND. It’s an awful idea to utilize HWND_TOPMOST with SendMessage once the you to deceased processes may bring the application so you can a halt. Profile 2 sumong different content-delivering properties. Whew!