usesHTTPApp, Masks;procedure TForm1.Button1Click(Sender: TObject);
varss,s: string;
begin//先提取一个文件名的字符串
  ss := Application.ExeName;ShowMessage(ss); //C:\Documents and Settings\wy\My Documents\RAD Studio\Projects\Project1.exe
//路径
  s := ExtractFilePath(ss);ShowMessage(s); //C:\Documents and Settings\wy\My Documents\RAD Studio\Projects\
//所在文件夹
  s := ExtractFileDir(ss);ShowMessage(s); //C:\Documents and Settings\wy\My Documents\RAD Studio\Projects
//所在逻辑盘
  s := ExtractFileDrive(ss);ShowMessage(s); //C:
//文件名
  s := ExtractFileName(ss);ShowMessage(s); //Project1.exe
//文件扩展名
  s := ExtractFileExt(ss);ShowMessage(s); //.exe
//相对路径
  s := ExtractRelativePath('C:\Documents and Settings\wy\My Documents\',ss);ShowMessage(s); //RAD Studio\Projects\Project1.exe
//dos下的短文件名
  s := ExtractShortPathName(ss);ShowMessage(s); //C:\DOCUME~1\wy\MYDOCU~1\RADSTU~1\Projects\Project1.exe
//转换到Unix路径格式, 需要 uses HTTPApp
  s := DosPathToUnixPath(ss);ShowMessage(s); //C:/Documents and Settings/wy/My Documents/RAD Studio/Projects/Project1.exe
//转Unix路径格式为Window格式, 是 DosPathToUnixPath 的逆操作
  s := ExpandUNCFileName(DosPathToUnixPath(ss));ShowMessage(s); //C:\Documents and Settings\wy\My Documents\RAD Studio\Projects\Project1.exe
//去掉结尾的路径分隔符
  s := ExcludeTrailingPathDelimiter(ExtractFilePath(ss));ShowMessage(s); //C:\Documents and Settings\wy\My Documents\RAD Studio\Projects
//去掉结尾的路径分隔符, 只是调用:ExcludeTrailingPathDelimiter
  s := ExcludeTrailingBackslash(ExtractFilePath(ss));ShowMessage(s); //C:\Documents and Settings\wy\My Documents\RAD Studio\Projects
//更换扩展名, 并不修改文件, 只是替换字符串:
  s := ChangeFileExt(ss,'.bak');ShowMessage(s); //C:\Documents and Settings\wy\My Documents\RAD Studio\Projects\Project1.bak
//更换文件路径:
  s := ChangeFilePath(ss,'c:\temp');ShowMessage(s); //c:\temp\Project1.exe
//判断第几个字符是否是路径分隔符:
  IsPathDelimiter(ss,3); //返回 True
//判断后缀名是不是 exe; 需要 uses Masks
  MatchesMask(ss,'*.exe'); //返回 True
end;

//分解 ProcessPath (需要 uses FileCtrl)
vars,p,f: string;d: Char;
begins := ParamStr(0);ShowMessage(s); //C:\Documents and Settings\wy\My Documents\RAD Studio\Projects\Project1.exe
  ProcessPath(s,d,p,f);ShowMessage(d); //C
  ShowMessage(p); //\Documents and Settings\wy\My Documents\RAD Studio\Projects
  ShowMessage(f); //Project1.exe
end;

//压缩显示 MinimizeName (需要 uses FileCtrl)
vars: string;
begins := ParamStr(0);s := MinimizeName(s,Self.Canvas,100);ShowMessage(s); //C:\...\Project1.exe
end;