技术交流,DH讲解.

最近写的程序里面想加入一个Log的功能,为了方便以后使用,所以就打算写一个控件.结果遇到了一个问题,这里和大家分享.

附上E文:有能力的朋友自己看下:

File types are not allowed as value parameters and as the base type of a file type itself. They are also not allowed as function return types, and you cannot assign them - those errors will however produce a different error message.

program Produce;

procedure WriteInteger(T: Text; I: Integer);
begin
  Writeln(T, I);
end;

begin
end.

In this example, the problem is that T is value parameter of type Text, which is a file type. Recall that whatever gets written to a value parameter has no effect on the caller's copy of the variable - declaring a file as a value parameter therefore makes little sense.

program Solve;

procedure WriteInteger(var T: Text; I: Integer);
begin
  Writeln(T, I);
end;

begin
end.

Declaring the parameter as a var parameter solves the problem.

Retrieved from "http://docwiki.embarcadero.com/RADStudio/en/E2002_File_type_not_allowed_here_(Delphi)"

好结束,我是DH.