如何在visual basic中锁定文本框 [英] how to lock textbox in visual basic

问题描述

你好
 
我在 vb6中开发了一个应用程序。 在该应用程序中，我已经 text 框控制  读取条形码。现在   text 框用户可以输入任何 值我想要的  如果 用户尝试 输入   text 框应用程序将忽略用户输入。只有条形码会在 text 框中扫描 。其他明智的  任何控制到 < span class =code-keyword>只读条形码。 
 
感谢  advance。

解决方案

你不能这样做。这种条形码扫描仪实现为键盘驱动器。这有时被称为键盘楔。或者，它可以像USB键盘一样工作。请参阅： http://en.wikipedia.org/wiki/Barcode_scanner#Keyboard_wedges [ ^ ]。



从技术上讲，这只是一个键盘。在我看来，这种方法非常难看，但是这个东西的开发是为了提供对这类硬件的访问，即使对于最糟糕的程序员也是如此。 :-)



现在，如果您以某种方式禁用聚焦控制，扫描仪将在其他地方键入。据我所知，没有一种记录方式可以让应用程序告诉来自另一个键盘的事件来自另一个键盘。

-SA

hello there

         i had develop a application in vb6. In that application i had take a text box control for read a barcode. Now in that text box  user can enter any values what i want i want to if user trying to entering in text box application will ignore user input. Only barcode will scan on that text box. Other wise is there any control to read only barcode.

Thanks in advance.

解决方案

You cannot do it this way. This kind of barcode scanner is implemented as a keyboard driver. This is sometimes called "keyboard wedge". Or, it could behave as the USB keyboard. Please see: http://en.wikipedia.org/wiki/Barcode_scanner#Keyboard_wedges[^].

Technically, this is just a keyboard. In my opinion, such approach is quite ugly, but this thing was develop to provide access to this kind of hardware even to the lousiest programmers. :-)

Now, if you disable your focused control somehow, the scanner will "type" somewhere else. To best of my knowledge, there is no a documented way for an application to tell events coming from one keyboard from another one.

—SA

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