条形码扫描仪键盘挂钩. [英] Barcode Scanner keyboard hooks.

问题描述

伙计们，

我需要集成一个条形码扫描器，该条形码扫描器的作用类似于没有应用程序的USB键盘.我们的应用程序具有一个现有的低级键盘挂钩，其创建方法如下:
:: SetWindowsHookEx(WH_KEYBOARD_LL，LLKeyboardHook，hModule，0);

这里的问题是此低级键盘挂钩无法捕获条形码扫描器模拟的按键.如果我使用"WH_KEYBOARD"钩子类型创建钩子，则可以从条形码扫描仪获得正确的输入.但是由于某些限制，我将无法使用这种类型的钩子.

这是捕获条形码扫描仪输入的正确方法吗?应该做更多的事情吗?我希望条形码扫描器可以像键盘一样工作，因此应该将其卡在现有的键盘挂钩中.

有人遇到过这个问题吗?任何想法或示例代码都将受到高度赞赏.

预先感谢.

Folks,

I need to integrate a barcode scanner that acts like a USB keyboard with out application. Our application has an existing low level keyboard hook that is created as follows
::SetWindowsHookEx( WH_KEYBOARD_LL, LLKeyboardHook, hModule , 0);

The problem here is that this low-level keyboard hook is unable to capture the key presses emulated by the barcode scanner. If I create the hook using the "WH_KEYBOARD" hook type , then I am able to get the correct input from the barcode scanner. But due to certain constraints, I wouldnt be able to use a hook of this type.

Is this the correct way to trap the input from a barcode scanner? Should anything more be done? I was hoping that since the barcode scanner would act like a keyboard, it should get trapped in the existing keyboard hook.

Anyone faced this problem before? Any thoughts or sample code is highly appreciated.

Thanks in advance.

推荐答案

跳过键盘挂钩，并使用 OPOS或NPOS [^ ]

OPOS确实非常易于使用，可能比您当前的方法要容易得多.


或查看条形码扫描 [

Skip the keyboard hook and use an API like OPOS or NPOS[^]

OPOS is really easy to use, probably significantly easier than your current approach.


Or take a look at Barcode scanning[^] - look at revision 1 for a more complete version of the code. Allows you to easlily read barcodes from a Symbol barcode scanner connected to the serial port. All you need is to implment a single event handler.

Regards
Espen Harlinn

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