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Visual C++ - Edit Box & variable precision

Posted on 1997-06-21
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Last Modified: 2012-05-04
In Visual C++ 4.0, I have created 4 edit boxes and placed
 them on a dialog box. I have assigned a floating point
variable to each edit box. Next to each box I have a radio
button. By checking the radio button for one of the edit
 boxes, the relevant edit box will become disabled.
By changing the values of the other three edit boxes the
disabled box's value will change. The problem is how do
I change the amount of decimal places displayed in the
disabled edit box. I would also like to change the color
of the result if it goes out of range.
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Question by:robvg
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chensu earned 200 total points
ID: 1164015
You can convert a floating point variable to a string by using ::_ecvt(), ::_fcvt(), ::_gcvt(), ::wsprintf() with which you can determine the precision you want. In order to change the color of the edit box, you need to process WM_CTLCOLOR in your own edit box class or ON_WM_CTLCOLOR_REFLECT() in your own dialog class. See MFC Technical Notes: TN062: Message Reflection for Windows Controls.
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