如何搜索"StringA"的字节数组？

Question

使用FreePascal(或Delphi,如果没有FP示例),给定一个2048字节的缓冲区作为"字节数组",如何在缓冲区中搜索"StringA"？

var
Buffer : array[1..2048] of byte;
...
  repeat
      i := 0;
      BlockRead(SrcFile, Buffer, SizeOf(Buffer), NumRead);      
      // Now I want to search the buffer for "StringA"? 
...

谢谢

Answer 1

我认为这将在fpc中工作而无需额外的Unicode/AnsiString转换:

function Find(const buf : array of byte; const s : AnsiString) : integer;
//returns the 0-based index of the start of the first occurrence of S
//or -1 if there is no occurrence
var
  AnsiStr : AnsiString;
begin
  SetString(AnsiStr, PAnsiChar(@buf[0]), Length(buf));
  Result := Pos(s,AnsiStr) - 1;  // fpc has AnsiString overload for Pos()
end;