C++ problem with sending keystrokes

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August 7th, 2011, 08:24 AM
Doomy

C++ problem with sending keystrokes

I'm trying to send keystrokes to another application(so far succesfully) but it wont send the '%', hex value should be 0x25, I have tried multiple times, I'm pretty sure my code is fine so:/. Any way I can send a % anyway?
August 7th, 2011, 09:03 AM
VictorN

Re: C++ problem with sending keystrokes

Quote:

Originally Posted by Doomy

I'm trying to send keystrokes to another application(so far succesfully) but it wont send the '%', hex value should be 0x25, I have tried multiple times, I'm pretty sure my code is fine so:

Then what is the problem if your code is fine? Or it is NOT fine since it fails by sending '%' char? :confused:

Quote:

Originally Posted by Doomy

Any way I can send a % anyway?

Perhaps using SendInput API. :rolleyes:
And, BTW, how are you doing it now?
August 7th, 2011, 10:37 AM
Doomy

Re: C++ problem with sending keystrokes

Quote:

Originally Posted by VictorN

Then what is the problem if your code is fine? Or it is NOT fine since it fails by sending '%' char? :confused:

Perhaps using SendInput API. :rolleyes:
And, BTW, how are you doing it now?

The only thing that fails is sending the % char, all other letters numbers and signs(I need atleast) work, I've seen a lot of people use SendInput() but I have yet to find a good explanation of how to use it, can you help me?

I forgot to add I'm using keybd_event now (I know I should be using SendInput but as I stated before I haven't seen anyone use it in a simple way for anyone to understand -.~)
I'm kinda a newby with API
August 7th, 2011, 10:51 AM
VictorN

Re: C++ problem with sending keystrokes

Quote:

Originally Posted by Doomy

I've seen a lot of people use SendInput() but I have yet to find a good explanation of how to use it, can you help me?

Just search the Forums for SendInput examples...
August 7th, 2011, 10:58 AM
Doomy

Re: C++ problem with sending keystrokes

Quote:

Originally Posted by VictorN

Just search the Forums for SendInput examples...

but that doesnt explain why i cant send a % with keybd_event..
August 7th, 2011, 11:28 AM
VictorN

Re: C++ problem with sending keystrokes

Define "cant send a % with keybd_event"
What fails: keybd_event? Or "another application" doesn't react to the '%' sign been sent?
August 7th, 2011, 04:16 PM
Doomy

Re: C++ problem with sending keystrokes

Quote:

Originally Posted by VictorN

Define "cant send a % with keybd_event"
What fails: keybd_event? Or "another application" doesn't react to the '%' sign been sent?

A keyboardevent is being sent but its not a %, it seems to be simulating left arrow key or something...
August 7th, 2011, 04:25 PM
VictorN

Re: C++ problem with sending keystrokes

And how is it interpreted if you *directly* (via keyboard) "send" % to this application?
August 7th, 2011, 04:31 PM
VictorN

Re: C++ problem with sending keystrokes

Quote:

Originally Posted by Doomy

A keyboardevent is being sent but its not a %,

How do you know it?
keybd_event does not return any value (it is void) so it is impossible to know whether it succeeds or fails (note that Sendinput type is int and if it filed then GetLastError will give you the extended error info)
August 7th, 2011, 08:08 PM
Doomy

Re: C++ problem with sending keystrokes

Quote:

Originally Posted by VictorN

How do you know it?
keybd_event does not return any value (it is void) so it is impossible to know whether it succeeds or fails (note that Sendinput type is int and if it filed then GetLastError will give you the extended error info)

I had it use an autokey in a textbox with text that was marked, after the keybdevents it wasnt marked anymore and the blinking | was one character from the end instead of the end
August 7th, 2011, 09:39 PM
Paul McKenzie

Re: C++ problem with sending keystrokes

Quote:

Originally Posted by Doomy

I had it use an autokey in a textbox with text that was marked, after the keybdevents it wasnt marked anymore and the blinking | was one character from the end instead of the end

Let us see the code that calls keybd_event for this character, including the values you're using to call keybd_event.

Regards,

Paul McKenzie
August 8th, 2011, 01:05 AM
VictorN

Re: C++ problem with sending keystrokes

Quote:

Originally Posted by Doomy

I had it use an autokey in a textbox with text that was marked, after the keybdevents it wasnt marked anymore and the blinking | was one character from the end instead of the end

Could it be that % sign has some special meaning for this text box?
August 8th, 2011, 08:39 PM
Doomy

Re: C++ problem with sending keystrokes

Quote:

Originally Posted by VictorN

Could it be that % sign has some special meaning for this text box?

no i tried putting a % in myself it worked fine
August 9th, 2011, 05:12 AM
Paul McKenzie

Re: C++ problem with sending keystrokes

Quote:

Originally Posted by Doomy

no i tried putting a % in myself it worked fine

So are we to keep guessing, or are you going to show us your code?

Regards,

Paul McKenzie
August 9th, 2011, 06:19 AM
Doomy

Re: C++ problem with sending keystrokes

Quote:

Originally Posted by Paul McKenzie

So are we to keep guessing, or are you going to show us your code?

Regards,

Paul McKenzie

keybd_event(0x25, 0, 0, 0);
keybd_event(0x25, 0, KEYEVENTF_KEYUP, 0);
there, does that help in any way? i doubt it.
August 9th, 2011, 09:26 AM
VladimirF

Re: C++ problem with sending keystrokes

Quote:

Originally Posted by Doomy

keybd_event(0x25, 0, 0, 0);
keybd_event(0x25, 0, KEYEVENTF_KEYUP, 0);
there, does that help in any way? i doubt it.

Sure it helps.
At least it shows that you are NOT sending '%'. According to MSDN:

Quote:

VK_LEFT 0x25 LEFT ARROW key
August 9th, 2011, 09:42 AM
VictorN

Re: C++ problem with sending keystrokes

Good catch, Vlad! :thumb:
August 9th, 2011, 09:50 AM
Paul McKenzie

Re: C++ problem with sending keystrokes

Quote:

Originally Posted by Doomy

keybd_event(0x25, 0, 0, 0);
keybd_event(0x25, 0, KEYEVENTF_KEYUP, 0);
there, does that help in any way?

http://msdn.microsoft.com/en-us/libr...(v=vs.85).aspx

Where do you see in the documentation above that 0x25 is the "%" key? The virtual key code you're sending is the left-arrow. So your program behaves exactly as expected.

Secondly, the "%" is a shifted-5 key. So how are you sending the shift-key? I have never used keybd_event, but as you can see, you need to distinguish between a shifted key and non-shifted key.

Quote:

i doubt it.

A bit of advice -- too many times, people believe their code is either not relevant to the problem, or think that their code is OK. Then what winds up happening is that when the code is posted late in the game, we see that the code was not correct. We could have saved a lot of time if you had posted the erroneous code much earlier, preferably in your first post.

Regards,

Paul McKenzie