[Rd] Rgui.exe 4.2.0 does not receive characters via the Windows API's PostMessage function

[jcfaria]

Dear Tomas,
I've tried, but I don't have the necessary C/C++ programming skills to 
fulfill your request.

Maybe someone can help us by transcribing the little code in object 
Pascal that I sent to C/C++.

If a small executable, made in Object Pascal, can help in your debug, I 
can provide.

Grateful for the attention,,
///\\\///\\\///\\\///\\\///\\\///\\\///\\\///\\\///\\\///\\\
Jose Claudio Faria
UESC/DCET/Brasil
joseclaudio.faria at gmail.com
Telefones:
55(73)3680.5545 - UESC
55(73)99966.9100 - VIVO
///\\\///\\\///\\\///\\\///\\\///\\\///\\\///\\\///\\\///\\\
If you have software to deal with statistics, you have arms,
if you have good software, you have arms and legs,
if you have software like R, you have arms, legs and wings...
the height of your flight depends only on you.

------ Mensagem original ------
De: "Tomas Kalibera" <tomas.kalibera using gmail.com>
Para: "jcfaria" <joseclaudio.faria using gmail.com>; "Duncan Murdoch" 
<murdoch.duncan using gmail.com>; r-devel using r-project.org
Enviado(s): 06/05/2022 04:24:44
Assunto: Re: [Rd] Rgui.exe 4.2.0 does not receive characters via the 
Windows API's PostMessage function

>
>On 5/6/22 07:03, jcfaria wrote:
>>Dear Duncan,
>>I believe the problem is of a different nature.
>>I get TRUE 3 times running the code below:
>>
>>procedure TfMain.btnPasteClick(Sender: TObject);
>>var
>>   i: integer;
>>   sTmp: string;
>>   hBN: HWND;
>>   j: bool;
>>
>>begin
>>   hBN:= FindWindowA(nil,
>>                     'R Console (64-bit)');
>>
>>   sTmp:= 'sd';
>>
>>   for i:= 1 to Length(sTmp) do begin
>>     j:= PostMessage(hBN,
>>                     WM_CHAR,
>>                     Ord(sTmp[i]),
>>                     0);
>>
>>     ShowMessage(BoolToStr(j,
>>                           True));
>>   end;
>>
>>   j:= PostMessage(hBN,
>>               WM_KEYDOWN,
>>               VK_RETURN, 0);
>>
>>   ShowMessage(BoolToStr(j,
>>                         True));
>>end;
>>
>>That is, Rgui is receiving the message of the characters (via PostMessage), but it is blocking because it does not show them in the console.
>>The only thing Rgui blames is Carriage Return, as it adds an additional prompt with each run.
>
>I can't provide a good guess what impacted your use, but if you could give me a full example, ideally in C, which can be compiled with Rtools42 (so gcc, MinGW) and I can edit/recompile, and works with R 4.1, I am happy to help debugging on 4.2.
>
>Rgui now uses GraphApp Unicode windows on systems where it didn't before, because it uses UTF-8 also on systems it didn't before (on systems that would use a single-byte locale in R 4.1). These Unicode windows are a different code path and there may be bugs not reported previously, including processing inputs (recently I fixed handling of accents, for example). Otherwise indeed R now uses UTF-8 as native encoding and UCRT as the C runtime.
>
>Best
>Tomas
>
>
>>
>> >
>> >
>>
>>Best,
>>///\\\///\\\///\\\///\\\///\\\///\\\///\\\///\\\///\\\///\\\
>>Jose Claudio Faria
>>UESC/DCET/Brasil
>>joseclaudio.faria at gmail.com
>>Telefones:
>>55(73)3680.5545 - UESC
>>55(73)99966.9100 - VIVO
>>///\\\///\\\///\\\///\\\///\\\///\\\///\\\///\\\///\\\///\\\
>>If you have software to deal with statistics, you have arms,
>>if you have good software, you have arms and legs,
>>if you have software like R, you have arms, legs and wings...
>>the height of your flight depends only on you.
>>
>>------ Mensagem original ------
>>De: "Duncan Murdoch" <murdoch.duncan using gmail.com>
>>Para: "jcfaria" <joseclaudio.faria using gmail.com>; r-devel using r-project.org
>>Enviado(s): 05/05/2022 13:17:53
>>Assunto: Re: [Rd] Rgui.exe 4.2.0 does not receive characters via the Windows API's PostMessage function
>>
>>>On 05/05/2022 11:17 a.m., jcfaria wrote:
>>>>Hello,
>>>>
>>>>Rgui.exe 4.2.0 does not receive characters via the Windows API's
>>>>PostMessage function.
>>>>
>>>>The Tinn-R project sends messages to Rgui.exe (SDI mode) via the Windows
>>>>API's PostMessage function.
>>>>A simplification of the code (in object Pascal) can be seen below.
>>>>
>>>>procedure TfMain.btnPasteClick(Sender: TObject);
>>>>var
>>>>     i: integer;
>>>>     sTmp: WideString;
>>>>     hBN: HWND;
>>>>
>>>>begin
>>>>     hBN:= FindWindowA(nil,
>>>>                       'R Console (64-bit)');
>>>>
>>>>     sTmp:= 'sd';
>>>>
>>>>     for i:= 1 to Length(sTmp) do begin
>>>>       PostMessage(hBN,
>>>>                   WM_CHAR,
>>>>                   Ord(sTmp[i]),
>>>>                   0);
>>>>     end;
>>>>
>>>>     PostMessage(hBN,
>>>>                 WM_KEYDOWN,
>>>>                 VK_RETURN, 0);
>>>>end;
>>>>
>>>>This code has always worked fine for all versions of Rgui.exe with the
>>>>exception of the last one released, ie 4.2.0.
>>>>
>>>>We've been trying to get around the problem on the Object Pascal side,
>>>>but without success so far.
>>>>
>>>>Does anyone connected to the compilation of Rqui.exe know what the
>>>>problem is?
>>>
>>>It could be that the new build enforces Windows security more stringently.  More details are described in the answer to this question:  https://stackoverflow.com/a/40139498/2554330, but at a minimum you should be checking the return value from PostMessage.
>>>
>>>Duncan Murdoch
>>>
>>>>
>>>>Best,
>>>>///\\\///\\\///\\\///\\\///\\\///\\\///\\\///\\\///\\\///\\\
>>>>Jose Claudio Faria
>>>>UESC/DCET/Brasil
>>>>joseclaudio.faria at gmail.com
>>>>Telefones:
>>>>55(73)3680.5545 - UESC
>>>>55(73)99966.9100 - VIVO
>>>>///\\\///\\\///\\\///\\\///\\\///\\\///\\\///\\\///\\\///\\\
>>>>If you have software to deal with statistics, you have arms,
>>>>if you have good software, you have arms and legs,
>>>>if you have software like R, you have arms, legs and wings...
>>>>the height of your flight depends only on you.
>>>>
>>>>     [[alternative HTML version deleted]]
>>>>
>>>>______________________________________________
>>>>R-devel using r-project.org mailing list
>>>>https://stat.ethz.ch/mailman/listinfo/r-devel
>>>
>>
>>______________________________________________
>>R-devel using r-project.org mailing list
>>https://stat.ethz.ch/mailman/listinfo/r-devel