c++ builder

Question

void __fastcall CommReceiveData(TObject *Sender, Pointer Buffer,WORD BufferLength);
调用时前两个参数怎么写

Answer 1

CommReceiveData (Sender:TObject;Buffer:Pointer;BufferLen:Word);这个方法应该是要接收串口的数据，先分配一个内存，执行完成后，内存中返回的应该是收到的数据。var
  Buffer:Array of Byte;
  BufferLen:Word;
begin
  BufferLen:=256;
  SetLength(Buffer,BufferLen);
  ZeroMemory(@Buffer[0],BufferLen);
  CommReceiveData(Self,@Buffer[0],BufferLen);
  处理收到的数据
 
  SetLength(Buffer,0);
end;