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Everything posted by Alberto Fornés
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Good Job¡, and very nice scroll movement. I like it¡
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Programs with embedded P4D only run on my own PC, not on any other
Alberto Fornés replied to JGMS's topic in Python4Delphi
I don't know about Python, but if I understand correctly : is it possible to make an isolated installation of Python including libraries like matplotlib, pandas, etc and using it from Delphi?. Is it needed any user installation?. Thanks -
I am rewriting an editor where I am looking to display some text on the screen, to which I can zoom and therefore increase or decrease its size, and ensure that what I display on the screen corresponds to what I get when printing what has been drawn. From what I've been reading, GDI doesn't always respect these relationships in terms of text sizes, although when printing it can display the result well. As I show in tests I've done where I want to draw a 10mm high text, when I double the height to 20mm, the width of the text is not equal to double, as seen in the image. Is there a way to get the ratio to hold and equal to what we get in print, thanks. I use this code to draw the text: procedure TForm3.Button4Click(Sender: TObject); var h: integer; TextOutSize: TSize; NewFont, OldFont: HFont; // holds the old and new fonts begin bmp:= TBitmap.Create(Image1.Width,Image1.Height); bmp.PixelFormat:= pf32bit; try bmp.Canvas.Brush.Color:= clWhite; bmp.Canvas.Brush.Style:= bsSolid; bmp.Canvas.FillRect(Rect(0,0,Image1.Width,Image1.Height)); bmp.Canvas.Pen.Color:= clSilver; d:= 0; h:= 0; while d<= Image1.Width do begin if (h = 5) then begin bmp.Canvas.Pen.Color:= clGray; h:= 0; end else bmp.Canvas.Pen.Color:= clSilver; bmp.Canvas.MoveTo(d,0); bmp.Canvas.LineTo(d,Image1.Height); Inc(d,10); Inc(h); end; d:= 0; h:= 0; while d<= Image1.Height do begin if (h = 5) then begin bmp.Canvas.Pen.Color:= clGray; h:= 0; end else bmp.Canvas.Pen.Color:= clSilver; bmp.Canvas.MoveTo(0,d); bmp.Canvas.LineTo(Image1.Width,d); Inc(d,10); Inc(h); end; bmp.Canvas.Brush.Style:= bsClear; bmp.Canvas.Font.Color:= clBlack; SetMapMode(bmp.Canvas.Handle,MM_ISOTROPIC); SetViewportExtEx(bmp.Canvas.Handle,Image1.Width,Image1.Height,0); SetWindowExtEx(bmp.Canvas.Handle,Round(Image1.Width * 25.4 / GetDeviceCaps(bmp.Canvas.Handle, LOGPIXELSX)),Round(Image1.Height * 25.4 / GetDeviceCaps(bmp.Canvas.Handle, LOGPIXELSY)),0); // Create a 10 mm font NewFont:= CreateFont(10, 0, 0, 0, FW_NORMAL, 0, 0, 0, DEFAULT_CHARSET, OUT_TT_ONLY_PRECIS, CLIP_DEFAULT_PRECIS, PROOF_QUALITY, DEFAULT_PITCH or FF_DONTCARE, 'Arial'); OldFont := SelectObject(bmp.Canvas.Handle, NewFont); bmp.Canvas.Pen.Width:= 0; bmp.Canvas.Pen.Color:= clBlue; TextOut(bmp.Canvas.Handle,0,10,txt, Length(txt)); MoveToEx(bmp.Canvas.Handle,0,10,nil); LineTo(bmp.Canvas.Handle,230,10); MoveToEx(bmp.Canvas.Handle,0,20,nil); LineTo(bmp.Canvas.Handle,230,20); GetTextExtentPoint32(bmp.Canvas.Handle, PWideChar(txt), Length(txt), TextOutSize); TextOut(bmp.Canvas.Handle,230,10,PWideChar('Width: ' + TextOutSize.cx.ToString), Length('Width: ' + TextOutSize.cx.ToString)); SelectObject(bmp.Canvas.Handle, OldFont); DeleteObject(NewFont); // Create a 20 mm font NewFont:= CreateFont(20, 0, 0, 0, FW_NORMAL, 0, 0, 0, DEFAULT_CHARSET, OUT_TT_ONLY_PRECIS, CLIP_DEFAULT_PRECIS, PROOF_QUALITY, DEFAULT_PITCH or FF_DONTCARE, 'Arial'); OldFont := SelectObject(bmp.Canvas.Handle, NewFont); bmp.Canvas.Pen.Width:= 0; bmp.Canvas.Pen.Color:= clBlue; TextOut(bmp.Canvas.Handle,0,30,txt, Length(txt)); MoveToEx(bmp.Canvas.Handle,0,30,nil); LineTo(bmp.Canvas.Handle,230,30); MoveToEx(bmp.Canvas.Handle,0,50,nil); LineTo(bmp.Canvas.Handle,230,50); GetTextExtentPoint32(bmp.Canvas.Handle, PWideChar(txt), Length(txt), TextOutSize); TextOut(bmp.Canvas.Handle,230,30,PWideChar('Width: ' + TextOutSize.cx.ToString), Length('Width: ' + TextOutSize.cx.ToString)); SelectObject(bmp.Canvas.Handle, OldFont); DeleteObject(NewFont); Image1.Picture.Assign(bmp); finally FreeAndNil(bmp); end; end;
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Thanks Peter, I will investigate in that direction. Do you have experience about the speed performance to calculate widths and drawing character individually?
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Hello, some time ago I thought of making a program that could be used by young programmers and students who need to write a project document and show them the possibilities of programs they could develop with Delphi. I have recently published the program and it is called TICdoc. The program also has a diagram editor and a code editor for saving code snippets that can be tagged for further searches. A project document is generated by uniting various types of sections (functional requirements, table of contents, Gantt charts, use cases, etc). Some of these sections have their own editor and the editable sections have a text editor (html) to which styles (css) can be applied. The program uses a SQLite database. It is free and does not have any usage restrictions. It is signed with an OV certificate, which I know shows some warning when downloading it in the browser. You can see it at TICdoc , there is also a youtube channel (currently only in spanish) where you can watch short videos of program features Small task editor at intro page: Code editor to save snippets (SynEdit component): Diagram editor (TMS Diagram Studio), you can insert this diagrams into project document: Document editor (HTML component library): In the editable section you can insert images, formulas, tables, data-bound tables, editor diagrams or PlantUML diagrams: By clicking on the active language in the lower bar we can change the language (it is in a json file, so it can be translated into other languages, it is currently in Spanish and English)
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Yes, rapid development is not always the best solution for big projects.
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Is asked ChatGPT: What is Internet Component Suite for Delphi?
Alberto Fornés replied to FPiette's topic in ICS - Internet Component Suite
If ChatGPT do taht, we can say that it is the closest thing to human intelligence that we have seen so far. -
Send message frmo VCL app to another machine in lan
Alberto Fornés replied to mikak's topic in General Help
Maybe Tethering also can be used in that scenario. -
Hello, I have started working with Python4Delphi. I have installed Python 11, and in environment variables is set the path to the python exe folder and the scripts folder. I have installed with pip the modules of the examples of the webminar II of the tutorials (python4delphi/Tutorials/Webinar II at master · pyscripter/python4delphi · GitHub). I can't get to run the scripts without getting errors like: "no module named _ctypes", it's a required module for Pandas. I have also got this error with the unicodedata module, I installed with pip unicodedata2, but it doesn't work either. Any suggestions for things to check?
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Hello, and thanks for your reply. The python DLL 3.11 can be loaded because I can run basic scripts, but when try to execute scripts that imports modules like matplotlib, numpy, pandas, etc raises that errors. I confirm that 3.10.9 runs ok without that errors.
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I have an application developed with Delphi 10.4 where I use the Diamond vcl style. The app shows up fine, but when I run the same code with Delphi Alexandria it shows a strange result. The main window when the application starts (the same with Delphi 10.4 and Delpgi Alexandria): If I open a second form created by code. The result with Delphi 10.4 is this: But when open with Delphi Alexandria it shows wrong rendering: As you can see the border icons have disappeared, after closing the window, the main screen is also displayed wrong with Alexandria: Any suggestions of things to check?, thanks
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Hello, I have a Firebird table (ORDEN) where I need to have a unique numbering in a field depending on the date. In the before insert of the table I define a trigger that basically does this: SELECT MAX(NUMBER) FROM ORDEN WHERE FECHAINT >= :FECHA INTO :NUM; IF (:NUM IS NULL) THEN NUM = 0; NUM = :NUM + 1; NEW.NUMBER = :NUM; Sometimes numbers are repeated in this table, so I deduce that something is wrong in the handling of transactions to cause this error. I work with Firedac, what are the properties of the connection or the write and read transactions supposed to be to avoid this problem?, thanks
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Really is that there was no reason not to use it, finally it is what I have done and as Anders suggested it solves the problem. Thanks In this case the date did not work because I need also assign a code from that number. Thanks Anders, now works without repetitions using a generator.
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delphimvcframework global variable
Alberto Fornés replied to borni69's topic in Network, Cloud and Web
No , this datamodule should be created at start, and always alive, you reference it from your controller (add datamodule unit to controller), and access it through TMultiReadExclusiveWriteSynchronizer. -
delphimvcframework global variable
Alberto Fornés replied to borni69's topic in Network, Cloud and Web
Yes, you can use this in delphimvcframework. I declare such dictionary in the service unit (it's a windows service), or you can put it in a datamodule and create it at program start and destroy at the end. Webmodule can be created and destroyed several times during program execution. -
Maybe if you don't have the human resources and / or time to do a good test and find bugs before releasing the product, and you hope that the customers will find and report them, maybe Embarcadero could offer that version at a lower price and establish a more honest relationship.
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Hello, in a data exchange between vcl clients and a REST server, I have implemented a method to save the data in a stream, that stream I send to the client and it loads the data in a reverse process. I do this to reduce the information to be sent as much as possible and I do not directly use a SaveToStream of the table, query or stored procedure. The information of the fields I read from the IFDDataSetReference interface, and I have a problem when saving the blob fields, the procedure worked with Delphi 10.3 but with Delphi 10.4 there is something different that I cannot guess (I have a professional version and I do not have access to the FireDac code ) . The abbreviated code for the procedure is: //iData = IFDDataSetReference //FieldData = array of Fields ab: TArray<Byte>; bd: AnsiString; nl: Int64; var ADest:= TMemoryStream.Create; var wr:= TBinaryWriter.Create(ADest,TEncoding.UTF8,false); for i:= 0 to iData.DataView.Rows.Count - 1 do begin for c:= Low(FieldData) to High(FieldData) do begin //when blob field I do this begin //ValueI is a variant bd:= iData.DataView.Rows[i].ValueI[c]; //bd value is not the same in Delphi 10.3 as in Delphi 10.4 ab:= TEncoding.ANSI.GetBytes(bd); nl:= Length(ab); wr.Write(nl); wr.Write(ab); end; end; end; In client side I can read de stream with: ADest: TFDMemTable; nl:= sR.ReadInt64; if (nl = 0) then begin ADest.Fields[c].AsBytes:= nil; end else begin ADest.Fields[c].AsBytes:= sR.ReadBytes(nl); end;
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Finally I found how to solve the problem on the computer that was failing (only 24 days have passed!). Unchecking this option (in beta) from the regional settings. Does anyone know how the system identifies that a program is unicode or not?
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Hi Kas Ob, thanks again. Updated the sample, I included an incorrect file, in case of string fields I save the Tipo and the field size as metadata to generate the dataset again. Stream_Sample_2.zip
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Hello Kas Ob, thanks for you reply. As I said in second message the problem is not related to Delphi version, is related to computer where I execute the program. The DB is the same, I attach a small demo with the esential part of code where I can verify the error. When I open the program a TFDMemTable with different fields defined is open, I add a record with some values and use the add image button to load a blob field (in this case bitmap image included in sample code, that you can see on picture) : When Save Table button is pushed the data and some table metadata is used to fill a stream that can be saved in a file, although you can use de load table button to fill a second TFDMemTable with this stream, and assign the dataource to this dataset, in this case and in a certain computer the image is not readed correctly (in other blob cases this is an error): If you want to load the stream from saved file, push load stream button and then load table). The same program in other computer (it doesn't matter Delphi 10.3 or Delphi 10.4) works well, so I think it's a pc configuration that I can't guess. Stream_Sample_2.zip
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I expand the information, doing more tests I have verified that it is not a problem associated with Delphi 10.3 vs Delphi 10.4, I made that statement because I have two computers, one with Delphi Rio and the other with Delphi Sydney, but installing Delphi 10.3 on the other computer I have verified that the problem is due to the computer (Windows 10 in both cases). Any suggestions on any pc configuration that might motivate this?
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Hello, I have created a thread where there is a TIdTCPClient component that receives readings from a barcode reader connected through an ethernet base. The goal is for you to be in a connected service all day without stopping. The thread works, I can start and stop it several times, when I stop the thread I execute these steps to close the connection (FClient = TIdTCPClient): FClient.IOHandler.InputBuffer.Clear; FClient.IOHandler.CloseGracefully; FClient.Disconnect; FClient.Socket.Close; I don't know if they are all necessary, but I have tried to get the desired result. To test, I need to achieve a reconnection when a network failure is detected (for this I disconnect the cable from the pc), when I detect an error in the reading: try FData: = FClient.IOHandler.ReadLn; except on E: Exception do begin FClient.IOHandler.InputBuffer.Clear; FClient.IOHandler.CloseGracefully; FClient.Disconnect; FClient.Socket.Close; // Terminate thread end; In this second case, when I try to connect again, I get this message from the base: This channel is already in use, no slot is available. It seems that the old host-port socket remains active: how can I ensure that it is closed?
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Close a TIdTCPClient connection
Alberto Fornés replied to Alberto Fornés's topic in Network, Cloud and Web
Thanks Remy, your words are greatly appreciated on this topic. That's right, the host only accepts one connection, and the message is sent by it. I will find a way to close the connection (maybe restart the device) so that I can connect again. -
Install recent Delphi versions on Windows XP
Alberto Fornés replied to dummzeuch's topic in Delphi IDE and APIs
Hello, sorry for delay to respond, I was talking about executables generated with Delphi 10.3, not about installing Delphi 10.3 in a XP computer. I'm able to run the programs, except the problem with themes in some contros, as datatimepicker so I need to disable theme for that controls. -
Years ago I was testing various possibilities to display points, lines, polygons, etc. on a map, with various libraries and OpenGL was the one who did it the fastest, perhaps showing text found worse performance.