我可以改变一个用户的键盘输入？ [英] Can I change a user's keyboard input?
问题描述
我发现这个键盘钩子的代码，我想稍微修改一下我的目的：的 http://blogs.msdn.com/toub/archive/2006/05/03/589423.aspx
I found this keyboard hook code, which I'm trying to slightly modify for my purposes: http://blogs.msdn.com/toub/archive/2006/05/03/589423.aspx
作为概述，我想让用户按一个键，说'E'，并有键盘返回不同的性格，'Z'，到任何应用程序处于焦点。
As an overview, I want to have the user press a key, say 'E', and have the keyboard return a different character, 'Z', to whatever app is in focus.
有关方法我改变现在看起来像：
The relevant method I changed now looks like:
private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN)
{
//The truely typed character:
int vkCode = Marshal.ReadInt32(lParam);
Console.WriteLine((Keys)vkCode);
KBDLLHOOKSTRUCT replacementKey = (KBDLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(KBDLLHOOKSTRUCT));
replacementKey.vkCode = 90; // char 'Z'
Marshal.StructureToPtr(replacementKey, lParam, false);
//Now changed to my set character
vkCode = Marshal.ReadInt32(lParam);
Console.WriteLine((Keys)vkCode);
}
return CallNextHookEx(_hookID, nCode, wParam, lParam);
}
控制台正确输出该为：
The console correctly outputs this as:
E
Z
T
Z
G
Z
etc.
不过，焦点还是应用型'E'而不是'Z'。为什么？我改变了上瘾键盘输入遏制，而不是'E'Z'，并在控制台线显示，这是正确的改变！
HOWEVER, the in focus app still types 'E' instead of 'Z'. Why? I changed the hooked keyboard input to contain 'Z' instead of 'E', and the console lines show that it was changed correctly!
据我了解，在调用返回CallNextHookEx方法（_hookID，nCode，wParam中，lParam的）; 是发送现在打印此命令来打开的应用程序。是不是它是如何工作的？有没有东西是阻止我打字我想要的人物？我知道像AutoHotkey的应用需要一个输入键，检查，并返回一个不同的角色。我该怎么做了同样在这里？
As I understand it, calling the return CallNextHookEx(_hookID, nCode, wParam, lParam); is what sends the "print this now" command to the open app. Is that not how it works? Is there something that's preventing me from typing the character I want? I know apps like AutoHotkey take an input key, check it, and return a different character. How do I do the same here?
谢谢！
推荐答案
我这样做过，但有一点不同。结果
而不是试图改变发送到 CallNextHookEx方法的参数，我'吞'的按键（你可以从钩子程序返回非零值，以防止所谓的后续步骤）做到这一点。
I've done this before but a little different.
Instead of trying to change the parameters sent to CallNextHookEx, I 'swallowed' the key press (you can do this by returning a nonzero value from the hook procedure to prevent subsequent procedures from being called).
然后我用的 SendInput 送，我想注入新的密钥。
Then I used SendInput to send the new key that I wanted to 'inject'.
所以基本上它的工作原理是这样的：
So basically it works like this:
- 钩子程序标识目标的关键按
- 召唤SendInput，用新密钥
- 从钩子程序返回1忽略原始密钥
小心循环重定向，即一重定向到重定向到Ab，它可以轻松地炸毁;）
Be careful of cyclic redirects, i.e. 'a' redirected to 'b' redirected to 'a', it can easily blow up ;)
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