Image Delphi:传送图像
德尔福2010 我正在通过使用UTF-8的自定义TCP套接字控件传输图像 客户端Image Delphi:传送图像,image,delphi,stream,transfer,Image,Delphi,Stream,Transfer,德尔福2010 我正在通过使用UTF-8的自定义TCP套接字控件传输图像 客户端 var TSS: TStringStream; STR :String; JPG:TJPEGImage; BMP:TBitmap; begin Try BMP.LoadFromFile('C:\1.bmp'); JPG.Assign(BMP); JPG.CompressionQuality:=80; JPG.Compress; TSS:=TStringStream.Create; JPG.SaveToStrea
var
TSS: TStringStream;
STR :String;
JPG:TJPEGImage;
BMP:TBitmap;
begin
Try
BMP.LoadFromFile('C:\1.bmp');
JPG.Assign(BMP);
JPG.CompressionQuality:=80;
JPG.Compress;
TSS:=TStringStream.Create;
JPG.SaveToStream(TSS);
STR:=TSS.DataString;
MyTCPSocket.SendString(STR);
finally
BMP.free;
JPG.free;
TSS.free;
end;
end;
服务器端
Var
TSS: TStringStream;
TSS:=TStringStream.Create;
TSS.WriteString(STR);
TSS.SaveToFile('C:\2.jpg');
这段代码在同一台pc上运行非常好
将图像发送到其他使用不同编码的pc时出现的问题
它接收到图像,但我看到数据中有许多错误字符“??”
我认为当TStringStream将字节写入文件时,它无法将unicode字符转换为字节,因此看起来像“?”
非常感谢您的任何想法您正在尝试发送二进制数据,就像它是UTF-8编码的文本一样它不是,所以不要尝试这样做!以原始二进制形式发送二进制数据,例如:
var
MS: TMemoryStream;
JPG: TJPEGImage;
BMP: TBitmap;
begin
MS := TMemoryStream.Create;
try
JPG := TJPEGImage.Create;
try
BMP := TBitmap.Create;
try
BMP.LoadFromFile('C:\1.bmp');
JPG.Assign(BMP);
finally
BMP.Free;
end;
JPG.CompressionQuality := 80;
JPG.Compress;
JPG.SaveToStream(MS);
finally
JPG.Free;
end;
MS.Position := 0;
MyTCPSocket.SendStream(MS);
finally
MS.free;
end;
end;
如果必须以文本形式发送二进制数据,则需要使用真正的二进制到文本编码算法对数据进行编码,例如base64或yEnc、notUTF-8(该算法仅用于编码Unicode文本,而非二进制数据),例如:
Thx Remy我的问题是,使用的套接字仅支持发送utf8字符串。我使用EncodeStream函数从“EncdDecd”将流编码到base64 Thx,再次获得您的帮助:)
var
MS: TMemoryStream;
begin
MS := TMemoryStream.Create;
try
MyTCPSocket.ReadStream(MS);
MS.Position := 0;
MS.SaveToFile('C:\2.jpg');
finally
MS.Free;
end;
end;
// TIdEncoderMIME and TIdDecoderMIME are part of Indy,
// which ships with Delphi, but you can use whatever
// you want...
uses
..., IdCoderMIME;
var
S: String;
MS: TMemoryStream;
JPG: TJPEGImage;
BMP: TBitmap;
begin
MS := TMemoryStream.Create;
try
JPG := TJPEGImage.Create;
try
BMP := TBitmap.Create;
try
BMP.LoadFromFile('C:\1.bmp');
JPG.Assign(BMP);
finally
BMP.Free;
end;
JPG.CompressionQuality := 80;
JPG.Compress;
JPG.SaveToStream(MS);
finally
JPG.Free;
end;
MS.Position := 0;
S := TIdEncoderMIME.EncodeStream(MS);
finally
MS.free;
end;
MyTCPSocket.SendString(S);
end;
uses
..., IdCoderMIME;
var
S: string;
MS: TMemoryStream;
begin
S := MyTCPSocket.ReadString;
MS := TMemoryStream.Create;
try
TIdDecoderMIME.DecodeStream(S, MS);
MS.Position := 0;
MS.SaveToFile('C:\2.jpg');
finally
MS.Free;
end;
end;