if length(dbedit)>* then
.....

解决方案 »

  1.   

    直接设置DBEDIT的MaxLength属性不是更简单
      

  2.   

    if length(dbedit1)> 18 and  length(dbedit)< 18 then
    messagldlg('你输入的位数不是18位');为何以上代码不对呀?
      

  3.   

    在 MaxLength里面设
    倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪
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    倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪
    倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪
    倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪
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    倪倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪倪
    倪倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪倪
    倪倪倪磊磊磊倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪磊磊磊倪倪倪
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    倪倪倪倪倪倪倪倪
      

  4.   

    if length(dbedit1)> 18 or length(dbedit)< 18 then
    messagldlg('你输入的位数不是18位');为何以上代码不对呀?
      

  5.   

    if (length(dbedit1)> 18) or (length(dbedit)< 18) then
      

  6.   

    begin
    if length (dbedit1.text)< 18 then
    begin
    messagedlg('输入有误',mterror,[mbok],0) ;
    end;并且把dbEDIT的length 设为18
      

  7.   

    dbEDIT的length 设为18可以省去>18的判断
      

  8.   

    begin 
    if length(dbedit1.text)<>18 then
    begin
    messagebox("你输入的数字没有18位");
    end