![]() Q I've read several articles on how to disable system key sequences like Ctrl+Alt+Del, including one of yours in the September 2002 issue of MSDN® Magazine. But, how can I programmatically send Ctrl+Alt+Del? ![]() If you're trying to control another app, look for a scripting system, programming interface, or macro language. You have to get all the keys exactly right, and the slightest change in context or user interface can throw everything off. Regardless, there's no harm in Deny for now. One final warning: sending keystrokes is a notoriously flaky way to control another app. I don't think the point is that Motion is monitoring other apps as if it was a keystroke logger, but rather an app like FCPX might interact with Motion while both are in use. Maybe the Redmondtonians will fix it in the next release. So while SendKeys is easier to use and more powerful than SendInput, it doesn't work perfectly in all situations. I suspect it's a focus or timing problem-the keys are sent but then vanish into the ether because the window you think has the focus doesn't actually have it yet. For some reason, SendKeys doesn't always work. You can discover this yourself by testing Typematic and Typematic.NET against different apps like Microsoft Internet Explorer, Notepad, an MFC form view, or some other favorite app. But before you run off to use SendKeys, be advised that it's not as reliable as SendInput. Either change the application to handle messages, or use the SendKeys.SendWait method." Now that's what I call a friendly error message! Let this be an example to you all. When I invoked the common language runtime (CLR) Debugger to see what the heck happened, the Output window displayed the following message: "Additional information: SendKeys cannot run inside this application because the application is not handling Windows messages. ![]() Why should I wait for the app to finish eating its keys? Alas, when I tried it, Typematic crashed miserably with System.InvalidOperationException somewhere in. What could be easier? When I first attempted this, I naturally tried SendKeys::Send, not SendWait. For the keyboard it looks like this: struct KEYBDINPUT The INPUT structure holds a union that's either MOUSEINPUT or KEYBDINPUT (or HARDWAREINPUT, to simulate the toaster oven). It synthesizes input including keystrokes and mouse events by taking an array of INPUT structures, one for each input event-keystroke or mouse action. Should I send WM_KEYDOWN and WM_KEYUP messages, or is there a better way?Ī You can probably get your app to work by sending WM_KEYDOWN and WM_KEYUP messages, but SendInput is an API function designed specifically for this purpose. Q I'm trying to write an application that fills in forms by sending keystrokes to another application. NET from an MFC App, and MoreĬode download available at: CQA0501.exe(231 KB)
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