delphi消息发送字符串

delphi消息发送字符串

其实不论什么方法,归根揭底都是通过传递对象的指针来达到效果的。

方法一:

procedure SendString(strMSG: string);

var

Data: tagCOPYDATASTRUCT;

pBuf: PChar;

begin

GetMem(pBuf, Length(strMSG) + 1);

try

ZeroMemory(pBuf, Length(strMSG) + 1);

StrPCopy(pBuf, strMSG);

Data.cbData:= Length(strMSG);

Data.dwData:= Length(strMSG);

Data.lpData:= pBuf;

SendMessage(hTargetWin, WM_COPYDATA, Integer(Self.Handle), Integer(@Data));

finally

FreeMem(pBuf);

end;

end;

procedure WMCopyData(var MSG: TMessage); message WM_COPYDATA;

procedure TForm1.WMCopyData(var MSG: TMessage);

var

Data : ^tagCOPYDATASTRUCT;

strMSG: string;

begin

Data:= Pointer(Msg.lParam);

strMSG:= StrPas(Data.lpData);

ShowMessage(strMSG);

end;

方法二:

TMyRecord=record s:string; end;

tt:TMyRecord;

var tt:TMyRecord; begin tt.s:='s2343243'; PostMessage(handle,WM_My,integer(tt),5); end;

发送消息,由于参数只能是一个integer,你这样发只能发4个字节,所以要改成发指针,比如:

var tt:TMyRecord; begin tt.s:='s2343243'; PostMessage(handle,WM_My,integer(@tt),5); end;

接收的时候当然也不能用原来的方法:My:=TMyRecord(msg.WParam);这样取回来了,也要把TMyRecord声明成指针:

type PMyRecord=^TMyRecord; var My:PMyRecord; my:=PMyRecord(msg.WParam);

http://www.delphitop.com/html/jiqiao/2170.html