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POANE C API - Converting uint8_t String to MFC virtual key code
 

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  1. POANE C API - Converting uint8_t String to MFC virtual key code
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    <p>First, I apologize in an advance as this may be a bit of a vague question since as of now I don't have all too much to go off of.</p> <p>I'm in the process of writing an ANE that takes an AS3 String and passes it off to a MFC C++ dll that inputs it to Windows using <code>SendInput</code></p> <p><a href="http://msdn.microsoft.com/en-us/library/windows/desktop/ms646310%28v=vs.85%29.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/windows/desktop/ms646310%28v=vs.85%29.aspx</a></p> <p>Now I'm not yet too familiar with the Flash C API but I'm currently under the impression that Strings passed over from AS3 are typed as <code>const uint8_t</code> on the C side and populated using <code>FREGetObjectAsUTF8</code>. I'm using the following code to accomplish this: </p> <pre><code>uint32_t len; cost uint8_t str; FREGetObjectAsUTF8(argv[0], &amp;len, &amp;str); //string is a single char </code></pre> <p>To send the keystroke I'm using this</p> <pre><code>void KeyboardHelper::sendKeyStroke(int vk){ INPUT input = {0}; input.type = INPUT_KEYBOARD; input.ki.wScan = 0; //not scanning for hardware key input.ki.time = 0; input.ki.dwExtraInfo = 0; //virtual key code for the key we want to press input.ki.wVk = vk; input.ki.dwFlags = 0; //keypress SendInput(1, &amp;input, sizeof(input)); } </code></pre> <p><code>input.ki.wVk</code> is looking for the hex value of the keycode to be sent. MSDN has a list of all the hex values and associated keystrokes here:</p> <p><a href="http://msdn.microsoft.com/en-us/library/windows/desktop/dd375731%28v=vs.85%29.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/windows/desktop/dd375731%28v=vs.85%29.aspx</a></p> <p>This code does work and I am able to input a keystroke from my AIR app its just not the correct key. Since you can convert <code>uint8_t</code> to <code>int</code> my current incorrect code is calling <code>sendKeyStroke</code> like this:</p> <pre><code>FREGetObjectAsUTF8(argv[0], &amp;len, &amp;str); //line from above keyboardHelper-&gt;sendKeyStroke(int(str)); </code></pre> <p>Again, this does seem to work, but I just get a random input.</p> <p>I'm also not really even sure what the value of <code>str</code> or <code>int(str)</code> are since I haven't figured out how to step into this code when its being called from AIR. As a side-note, if anyone knows anything about debugging ANE's feel free to let me know :) (I'm using VS2012)</p> <p><strong>I guess the root of this question comes down to this:</strong></p> <p>Is it possible to convert a <code>const uint8_t</code> to a corresponding virtual key code? In this case I will only be dealing with one keystroke at a time.</p> <p>If not it also seems like <code>KEYBDINPUT wScan</code> takes a unicode character if <code>dwFlags</code> is set to <code>KEYEVENTF_UNICODE</code>. Would it be possible to convert <code>const uint8_t</code> to a <code>WORD</code> type I could use in <code>wScan</code>?</p> <p>I've been using the following MSDN docs as reference:</p> <p>KEYBDINPUT: <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/ms646271%28v=vs.85%29.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/windows/desktop/ms646271%28v=vs.85%29.aspx</a></p> <p>SendInput: <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/ms646310%28v=vs.85%29.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/windows/desktop/ms646310%28v=vs.85%29.aspx</a></p> <p>Thanks!</p>
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