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Questions tagged [tstream]

26 questions
30
votes
1 answer

Opening a TStream on stdin/stdout in a Delphi console app

I'm trying to write a Delphi console application that creates a TStream for its standard input, and another TStream for its standard output. (It will be launched by a host app with its input and output redirected to pipes, and will be passing binary…
Joe White
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8
votes
2 answers

TFileStream with offset

I need to extend TFileStream so that it can work with a file not from 0 offset, but from user defined offset. I mean it must interpret user defined offset as stream beginning. My code is: type TSuFileStream = class(TFileStream) protected …
JuniorD
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7
votes
4 answers

String to TStream

I'm attempting to convert a string to a TStream. My code below gives me an "Abstract Error" message on the CopyFrom line. I'm against a brick wall here, any ideas on how to solve this? procedure StringToStream(const AString: string; out AStream:…
Greg Bishop
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4
votes
1 answer

Delphi tstream: strange behaviour on create

I am new of Delphi. In the documentation of TStrem class, i read it is an abstract class. So i think the compiler goes in error when i try to create it with stream := TStream.Create(); Why not?
user3083618
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4
votes
5 answers

How can I descend from both TFileStream and TMemoryStream?

I have a class that inherits from TFileStream and a class that inherits from TMemoryStream. Both implement exactly the same functions to do with reading data eg: TCustomFileStream = class (TFileStream) function ReadByte: byte; function ReadWord:…
Bennyboy
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4
votes
1 answer

How to load a stream with a file copied in Windows clipboard

I've copied a file into the Windows clipboard (By simply clicking right, copy). I would like to load a TStream descendant with the file currently stored in the clipboard. uses Classes, Clipbrd; MyStream := TMemoryStream.Create; try //here I…
Fabrizio
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4
votes
2 answers

What are the underlying Read/Write methods for Streams in Delphi XE3

I have some derived Stream classes for older versions of RADStudio that just reimplement the Read,Write,Seek methods, and the Size and Position properties. I'm looking to port these to XE3, but I see that there are now (for example) three overloads…
Roddy
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3
votes
1 answer

TStream warning in delphi

I have the following code snippet Procedure TFrm.Retrieve(mystring : string); var bs : TStream; ... begin ... bs:=nil; //bs:= TStream.create; try bs := CreateBlobStream(FieldByName('Picture'), bmRead); finally …
Shirish11
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3
votes
2 answers

TStream as an object inside StringList

I am using Delphi 7 and playing with a StringList, with TStream as object. My test project has a ListBox, a Memo and 2 buttons (Add and Remove). Here is what I got so far: var List: TStringList; procedure TForm1.FormCreate(Sender:…
Guybrush
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2
votes
1 answer

Delphi - writing a large dynamic array to disk using stream

In a Delphi program, I have a dynamic array with 4,000,000,001 cardinals. I'm trying to write (and later read) it do a drive. I used the following: const Billion = 1000000000; stream := tFileStream.Create( 'f:\data\BigList.data',…
Jud McCranie
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2
votes
0 answers

Random delay when using TStream for reading custom stream from http server

I am using TIdHttp (from Indy components) for connecting to a camera that supports Sony Remote Api. The camera sends live view stream to an http connection as a response of an HTTP GET command. I wrote a TStream subclass and used it as a streaming…
Hossein
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1
vote
1 answer

Getting spaces after upgrading from Indy 9 on Delphi 6 to Indy 10 on Delphi 11

I have migrated from Delphi 6 to Delphi 11 (64 bit edition) and in that I'm using the Indy and ZLib components. I have migrated from Indy 9 to Indy 10, using the component to post API and before that I'm writing the String to a Stream via: var …
sn_na_v
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1
vote
0 answers

How to force a DataSnap REST TStream method to respond as content stream instead of a JSON Array

I've a DataSnap REST method returning files as TStream. The client side is Objective-C code on iOS, JavaScript code, and Delphi code. I compiled the server side with Delphi Sydney 10.4.1, upgrading from Delphi XE3. Testing the new version, I…
Giorgio Calzolato
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1
vote
0 answers

Http response: Cannot convert JSON into stream

I have an API in JAVA to upload a zip file to a server in Delphi, and I am doing it as follows: DSRESTConnection conn = new DSRESTConnection(); conn.setHost("example.com"); conn.setPort(8080); TServerMethods1 proxy =…
msc87
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1
vote
1 answer

DataSnap REST JavaScript client-side – How to show pdf file data returned as TStream from a TServerMethods method

I've a DataSnap server method function TServerMethods.GetFile(filename): TStream returning a file. In my test case the file is a simple .PDF. I'm sure this function works fine, as I'm able to open files on ObjectiveC client side app's where I've…
Giorgio Calzolato
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