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WM to switch input direction

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hello all RTL & non-RTL typers,


as you must have noticed, the keyboard combination Alt + Shift is often used to switch input language.

for RTL (right-to-left) languages, the keyboard combination Right Ctrl + Shift is commonly used to switch writing direction to RTL, and Left Ctrl + Shift to switch back to LTR. note: this is not the same as paragraph right-align / left-align!


i want to switch language and direction for the active window, and i found Send() to be somewhat unreliable.

solution (so far):

i managed to change the language by sending WM_INPUTLANGCHANGEREQUEST with lParam being the language code. that works perfectly. ref:




i can't find the relevant WM for changing the direction.

thanks to anyone who can provide any hint on that.

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yet again my premonitions misguide me! i was sure these only switch the language to whatever is next (or previous) on the list of languages. you are correct, that is exactly what i was looking for, thanks!

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