如何把 MyStream :TMemoryStream 转化为string

披着虎皮的石头 2013-06-21 11:31:37
如何把IdHTTP1返回的TMemoryStream,转化为string型。
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Function getStrFromStream :String; var t :TStream; s :String; i :Int64; begin t :=TFileStream.Create('c:\1.txt', fmOpenRead); try i :=t.Size; SetLength(s, i); t.ReadBuffer(s[1], i); //ShowMessage(s); result :=s; finally t.Free; end; end; 比较偷懒,论坛里发帖较简单的问题,不如搜索一下快。
xhz8000 2013-06-21
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strStream := TStringStream.Create(''); memStream.SaveToStream(strStream); strStream.DataString; //这个就是你要的字符串!
unit Unit1; interface uses Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, ExtCtrls, NMUDP, Buttons, Menus, ComCtrls,WinSock; type TForm1 = class(TForm) Panel1: TPanel; Edit1: TEdit; Label1: TLabel; NMUDP1: TNMUDP; BitBtn1: TBitBtn; Panel2: TPanel; Label2: TLabel; Label3: TLabel; Button1: TButton; Button2: TButton; GroupBox1: TGroupBox; ListBox1: TListBox; GroupBox2: TGroupBox; Memo1: TMemo; procedure BitBtn1Click(Sender: TObject); procedure NMUDP1DataReceived(Sender: TComponent; NumberBytes: Integer;FromIP: String; Port: Integer); procedure Edit1KeyPress(Sender: TObject; var Key: Char); procedure Button1Click(Sender: TObject); procedure Button2Click(Sender: TObject); procedure FormCreate(Sender: TObject); private { Private declarations } public { Public declarations } end; var Form1: TForm1; ComputerName: array[0..127] of Char; implementation {$R *.dfm} procedure TForm1.BitBtn1Click(Sender: TObject); var MyStream: TMemoryStream; TmpStr: String; i:integer; Begin if Edit1.Text<>'' then //如果所说的内容不为空,则发送。 begin NMUDP1.ReportLevel := Status_Basic; NMUDP1.RemotePort :=8888;//端口为:8888,可以自己定义,但必须与LocalPort相一致。 if ListBox1.Items[ListBox1.ItemIndex]=ComputerName then Edit1.Text:=ComputerName+'自言自语道:'+Edit1.Text //如果和自己对话. Else Edit1.Text:=ComputerName+'对'+ListBox1.Items[listbox1.itemindex]+'说:'+Edit1.Text; TmpStr :=Edit1.text; MyStream := TMemoryStream.Create; try MyStream.Write(TmpStr[1], Length(Edit1.Text)); if ListBox1.ItemIndex=0 then begin for i:=1 to ListBox1.Items.Count-1 do //如果选择"大家",则对所有的网友发送信息 begin NMUDP1.RemoteHost :=ListBox1.Items[i];//远程主机的名称或地址. NMUDP1.SendStream(MyStream);//发送信息. End; end else begin NMUDP1.RemoteHost :=ListBox1.Items[ListBox1.itemindex]; //仅对所选中的网友. NMUDP1.SendStream(MyStream); End; finally MyStream.Free; end; Edit1.Text:=''; Edit1.SetFocus; end else Edit1.SetFocus; end; procedure TForm1.NMUDP1DataReceived(Sender: TComponent; NumberBytes: Integer; FromIP: String; Port: Integer); var MyStream: TMemoryStream; TmpStr: String; begin MyStream := TMemoryStream.Create; try NMUDP1.ReadStream(MyStream); SetLength(TmpStr,NumberBytes); MyStream.Read(TmpStr[1],NumberBytes); Memo1.Lines.Add(TmpStr); //显示对话的内容. finally MyStream.Free; end; end; procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char); var MyStream: TMemoryStream; TmpStr: String; i:integer; Begin if (key=#13) and (Edit1.Text<>'') then //如果所说的内容不为空,且最后一个按键为"Enter",则发送。 begin NMUDP1.ReportLevel := Status_Basic; NMUDP1.RemotePort :=8888; if ListBox1.Items[ListBox1.ItemIndex]=ComputerName then Edit1.Text:=ComputerName+'自言自语道:'+Edit1.Text else Edit1.Text:=ComputerName+'对'+ListBox1.Items[listbox1.itemindex]+'说:'+Edit1.Text; TmpStr :=Edit1.text; MyStream := TMemoryStream.Create; Memo1.Lines.Add(TmpStr); //显示对话的内容. try MyStream.Write(TmpStr[1], Length(Edit1.Text)); if ListBox1.ItemIndex=0 then begin for i:=1 to ListBox1.Items.Count-1 do begin NMUDP1.RemoteHost :=ListBox1.Items[i]; NMUDP1.SendStream(MyStream); end; end else begin NMUDP1.RemoteHost :=ListBox1.Items[ListBox1.itemindex]; NMUDP1.SendStream(MyStream); end; finally MyStream.Free; end; Edit1.Text:=''; edit1.SetFocus; end else Edit1.SetFocus; end; procedure TForm1.Button1Click(Sender: TObject); var InputString:String; begin //增加网友,输入的可以是IP地址或计算机名称。 InputString:=InputBox('增加人员', 'IP地址或计算机名', ''); if Inputstring<>'' then ListBox1.Items.Add(Inputstring); ListBox1.ItemIndex:=0; end; procedure TForm1.Button2Click(Sender: TObject); begin //删除当前选中的网友,但"大家"不能被删除. if ListBox1.ItemIndex<>0 then ListBox1.Items.Delete(ListBox1.ItemIndex); end; procedure TForm1.FormCreate(Sender: TObject); var sz: dword; begin memo1.Text:=' '; sz := SizeOf(Computername); GetComputerName(ComputerName, sz);//得到本机的标识 ListBox1.Items.Clear; ListBox1.Items.Add('大家');//在网友清单中,增加"大家"和 ListBox1.Items.Add(ComputerName);//本机名称 ListBox1.ItemIndex:=0; end; end.

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