Question

delphi如何获取%APPDATA%全路径

Answer 1

GetEnvironmentVariable

Answer 2

楼上正解 SysUtils单元 有现成函数可调
GetEnvironmentVariable

Returns the value of an environment variable.

Delphi syntax:
GetEnvironmentVariable(Name: string): string;

C++ syntax:
extern PACKAGE AnsiString __fastcall GetEnvironmentVariable(const AnsiString Name);

Description
GetEnvironmentVariable returns the value of the environment variable indicated by Name.

举例
procedure TForm1.Button1Click(Sender: TObject);
begin
ShowMessage(GetEnvironmentVariable('APPDATA'));
end;