LabWindows/CVI String组件 如何限制字符输入

Question

问题：
       LabWindows/CVI 9.0 使用String组件作编辑框使用，如何限制字符输入，比如输入除数字外的字符时提示错误或者禁止输入非数字字符。
Primary Software: LabWindows/CVI Development Systems>>Base Package
Primary Software Version: 9.0
Primary Software Fixed Version: N/A
Secondary Software: N/A
Problem:
            When i use String as edit object to input some numbers,how can i do that limit the data input  only is Number?   thank you!
Solved!
Go to Solution.
Attachments:
QQ截图20131018180436.png ‏4 KB

Answer 1

Thanks for your advice, I have solved the problem.
int CVICALLBACK StringCallback (int panel, int control, int event,
   void * callbackData, int eventData1, int eventData2) {
  int key; / / The character being pressed.
  switch (event) {
   case EVENT_KEYPRESS:
    / / Get the pressed character.
    if ((key = GetKeyPressEventCharacter (eventData2)) == 0) break;
    / / If a digit (0 to 9) is pressed, swallow the keypress.
    if (!isdigit (key))
     SetKeyPressEventKey (eventData2, 0, 0, 0, 0, 0);
    break;
  return 0;