[英]Delphi indy streaming Http Server
The camera captures the image to the image. 相机将图像捕获到图像。 Wants this picture was available at http.
想要这张照片可以在http。 Can I use it somehow HTTPServer1CommandGet I display a?
我可以以某种方式使用它HTTPServer1CommandGet我显示一个? I just want to display the image of image1 on live If so, how?
我只想在现场显示image1的图像如果是这样,怎么样?
If you just need to display the latest image when a client asks for it, you can do something like this: 如果您只需要在客户端要求时显示最新图像,您可以执行以下操作:
type
TGetImageStream = class(TIdSync)
protected
FStream: TStream;
procedure DoSynchronize; override;
public
class procedure GetImage(Stream: TStream);
end;
procedure TGetImageStream.DoSynchronize;
begin
Form1.Image1.Bitmap.SaveToStream(FStream);
end;
class procedure TGetImageStream.GetImage(Stream: TStream);
begin
with Create do
try
FStream := Stream;
Synchronize;
finally
Free;
end;
end;
procedure TForm1.HTTPServer1CommandGet(AContext: TIdContext; ARequestInfo: TIdHTTPRequestInfo; AResponseInfo: TIdHTTPResponseInfo);
var
Strm: TMemoryStream;
begin
Strm := TMemoryStream.Create;
try
TGetImageStream.GetImage(Strm);
Strm.Position := 0;
except
Strm.Free;
raise;
end;
AResponseInfo.ResponseNo := 200;
AResponseInfo.ContentType := 'image/bmp';
AResponseInfo.ContentStream := Strm;
end;
But if you need to do live streaming of the camera images in real time, that gets a bit trickier. 但是如果你需要实时对相机图像进行实时流式传输,那就会变得有点棘手。 You can do it a few different ways.
你可以用几种不同的方式做到这一点。 For instance, using a client pull:
例如,使用客户端拉:
procedure TForm1.HTTPServer1CommandGet(AContext: TIdContext; ARequestInfo: TIdHTTPRequestInfo; AResponseInfo: TIdHTTPResponseInfo);
var
Strm: TMemoryStream;
begin
if ARequestInfo.Document = '' then
begin
AResponseInfo.Redirect('/');
end
else if ARequestInfo.Document = '/' then
begin
AResponseInfo.ResponseNo := 200;
AResponseInfo.ContentType := 'text/html';
AResponseIno.ContentText := '<html>'+EOL+
'<head>'+EOL+
'<title>Camera Image</title>'+EOL+
'<meta http-equiv="Refresh" content=5>'+EOL+
'</head>'+EOL+
'<body>'+EOL+
'<img src="/image">'+EOL+
'</body>'+EOL+
'</html>'+EOL;
end
else if ARequestInfo.Document = '/image' then
begin
Strm := TMemoryStream.Create;
try
TGetImageStream.GetImage(Strm);
Strm.Position := 0;
except
Strm.Free;
raise;
end;
AResponseInfo.ResponseNo := 200;
AResponseInfo.ContentType := 'image/bmp';
AResponseInfo.ContentStream := Strm;
end else begin
AResponseInfo.ResponseNo := 404;
end;
end;
Using a server push instead: 改为使用服务器推送:
procedure TForm1.HTTPServer1CommandGet(AContext: TIdContext; ARequestInfo: TIdHTTPRequestInfo; AResponseInfo: TIdHTTPResponseInfo);
var
Strm: TMemoryStream;
begin
Strm := TMemoryStream.Create;
try
AResponseInfo.ResponseNo := 200;
AResponseInfo.ContentType := 'multipart/x-mixed-replace; boundary=imgboundary';
AResponseInfo.CloseConnection := False;
AResponseInfo.WriteHeader;
AContext.Connection.IOHandler.WriteLn('--imgboundary');
repeat
Strm.Clear;
TGetImageStream.GetImage(Strm);
AContext.Connection.IOHandler.WriteLn('Content-type: image/bmp');
AContext.Connection.IOHandler.WriteLn;
AContext.Connection.IOHandler.Write(Strm);
AContext.Connection.IOHandler.WriteLn;
AContext.Connection.IOHandler.WriteLn('--imgboundary');
Sleep(5000);
until False;
finally
Strm.Free;
end;
end;
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