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.NET Forum / Languages / C# / December 2007KeysConverter Class
Can Anyone say me how to use the keysconverter class provided in .net Framework 3.0 I tried searching in MSDN but I couldn't figure out what is it exactly meant for... > Can Anyone say me how to use the keysconverter class provided in .net > Framework 3.0 > > I tried searching in MSDN but I couldn't figure out what is it exactly > meant for... It seems to me that the documentation for the class is reasonably clear: http://msdn2.microsoft.com/en-us/library/system.windows.forms.keysconverter.aspx Was there something about the description or documentation that didn't make sense to you? What are you trying to do? What problems are you having? Pete Well Im trying to design an .NET application which is similar to notepad except for which it supports multiple languages.. The Application consists of a rich textbox and a combo box The system will have multiple keyboard languages installed.. And the application when loading searches for the installed keyboard languages and shows it in a combo box.. InputLanguage[] lang = new InputLanguage[InputLanguage.InstalledInputLanguages.Count]; private void Form1_Load(object sender, EventArgs e) { InputLanguage.InstalledInputLanguages.CopyTo(lang, 0); foreach (InputLanguage l in lang) { comboBox1.Items.Add(l.Culture.EnglishName); } comboBox1.SelectedIndex = comboBox1.Items.IndexOf(InputLanguage.DefaultInputLanguage.Culture.EnglishName); comboBox1.SelectedItem = InputLanguage.DefaultInputLanguage.Culture.EnglishName; } Whenever the user changes the language then the current language is also changed through the following code,, private void comboBox1_SelectedIndexChanged(object sender, EventArgs e) { InputLanguage.CurrentInputLanguage = lang[comboBox1.SelectedIndex]; richTextBox1.Focus(); } Though the input language is changed the content of the rich text box remains unaltered... For Example when the Input Language Is selected as English(United States) when I press the keys 1,2,3,4,5,6 I get in the textbox as 123456 when the input language Is selected as French (France) when I press the keys 1,2,3,4,5,6 I get in the textbox as &é"'(- What I need is that when I change the language from English(United States) to French (France) the text should also change from 12346 to &é"'(- Earlier someone said me it is not possible until I record the keystrokes that are being entered into the richtextbox.. so I m in need of a code that could do the above thing.. Thanks Rajkiran > [...] > when the Input Language Is selected as English(United States) when I [quoted text clipped - 10 lines] > States) > to French (France) the text should also change from 12346 to &é"'(- If I understand correctly, the text that should change is the text displayed in the text box itself. > Earlier someone said me it is not possible until I record the keystrokes > that are being entered into the richtextbox.. That sounds about right. Not only would you need to record the keystrokes, presumably you'd need some way to send those keystrokes through the input language-dependent code and rebuild the text box text from the logged keystrokes. Of course, not all keystrokes create a character in the text box, so you also may need some way of accounting for those (unless you literally just want to play back the user's entire input sequence every time you need to rebuild the text box's text). Of course, assuming this is really supposed to be a text editor, then you still have the problem of what to do with saving or loading a text file. It's one thing to maintain all this meta-data about the inputed text during your program's execution. But it's not like you can save that meta-data with the text file. It seems to me that for a variety of reasons, you might find it's more productive to somehow come up with a mapping for characters generated with the input in one language to those generated for the same input in another language. Unfortunately, I expect that may be fraught with pitfalls as well, given that keyboard input and text characters don't really have a one-to-one mapping (in spite of their close relevance to each other). In any case, the KeysConverter class is, according to the documentation, mainly used for translating the _names_ of the Keys instances, not the generated text itself. There might be some overlap there, but I doubt it's actually going to do what you want here. Pete Thanks for the reply there.. Well can u please help in recording he keystrokes... and I tried the sendkeys method from the Microsoft.VisualBasic.Devices.Keyword class.. However I ended up in getting the same text again.. I would like to know how to capture the keystrokes and send it back as an input to the richtext... Assuming that all the text will be Entered manually and no pasting are loading from file is implemented... I used the following but I noticed that it captures only the character and not the keystroke itself.. System.Collections.Queue keyobj = new System.Collections.Queue(); private void richTextBox1_KeyPress(object sender, KeyPressEventArgs e) { keyobj.Enqueue(e.KeyChar); } > If I understand correctly, the text that should change is the text > displayed in the text box itself. > That sounds about right. Not only would you need to record the > keystrokes, presumably you'd need some way to send those keystrokes [quoted text clipped - 23 lines] > > Pete > Thanks for the reply there.. Well can u please help in recording he > keystrokes... > > and I tried the sendkeys method from the > Microsoft.VisualBasic.Devices.Keyword class.. However I ended up in getting > the same text again.. I'm not familiar with that class. The SendKeys that I refered to would be Windows.Forms.SendKeys. > Thanks for the reply there.. Well can u please help in recording he > keystrokes... Keep in mind that I basically know nothing about the things you're trying to solve. All I can comment on is what I read in the documentation and whether what someone else says _seems_ to make sense (I have no way to know for sure it does or does not). > and I tried the sendkeys method from the > Microsoft.VisualBasic.Devices.Keyword class.. However I ended up in > getting the same text again.. > [...] > I used the following but I noticed that it captures only the character > and not the keystroke itself.. Well, I don't know whether the difference between the SendKeys() you're using and the SendKeys() in the Forms namespace is significant. However, at the very least I would expect that you'd need to use the KeyDown event, rather than the KeyPress. By the time the data gets to KeyPress, it's already been translated into an actual character. You seem to be wanting to tie the input to the actual key being pressed, and the KeyDown event is what provides that information. Whether you'll be able to use that data with any version of SendKeys() I can't say. Pete Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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