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PODelphi Unicode and Console
 

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  1. PODelphi Unicode and Console
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    <p>I am writing a C# application that interfaces with a pair of hardware sensors. Unfortunately the only interface that is exposed on the devices requires a provided dll written in Delphi.</p> <p>I am writing a Delphi executable wrapper that takes calls the necessary functions for the DLL and returns the sensor data over stout. However, the return type of this data is a PWideChar (or PChar) and I have been unable to convert it to ansi for printing on command line.</p> <p>If I directly pass the data to WriteLn, I get '?' for each character. If I look through the array of characters and attempt to print them one at a time with an Ansi Conversion, only a few of the characters print (they do confirm the data though) and they will often print out of order. (printing with the index exposed simply jumps around.) I also tried converting the PWideChar's to integer straight: 'I' corresponds to 21321. I could potentially figure out all the conversions, but some of the data has a multitude of values.</p> <p>I am unsure of what version of Delphi the dll uses, but I believe it is 4. Definately prior to 7.</p> <p>Any help is appreciated!</p> <p>TLDR: Need to convert UTF-16 PWideChar to AnsiString for printing.</p> <p><strong>Example application:</strong></p> <pre><code>program SensorReadout; {$APPTYPE CONSOLE} {$R *.res} uses Windows, SysUtils, dllFuncUnit in 'dllFuncUnit.pas'; //This is my dll interface. var state: integer; answer: PChar; I: integer; J: integer; output: string; ch: char; begin try for I := 0 to 9 do begin answer:= GetDeviceChannelInfo_HSI(1, Ord('a'), I, state); //DLL Function, returns a PChar with the results. See example in comments. if state = HSI_NO_ERRORCODE then begin output:= ''; for J := 0 to length(answer) do begin ch:= answer[J]; //This copies the char. Originally had an AnsiChar convert here. output:= output + ch; end; WriteLn(output); end; except on E: Exception do Writeln(E.ClassName, ': ', E.Message); end; ReadLn(I); end.` </code></pre> <p>The issue was PAnsiChar needed to be the return type of the function sourced from the DLL.</p>
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    1. COHow does the text you wish to output look like? Perhaps it *cannot* be represented as an AnsiString? For instance, the Unicode string `⌬‽∫∇❦∴φ┶` cannot be 'converted' to an AnsiString.
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      1. USAndreas Rejbrand
    2. COThe text is appearing as ???. The expected output for one example is: "ISO 4190250" but I am getting "????????". If I convert char by char, I will get the S and a 4, but the others either are empty or cause strange IO problems.
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    3. COProbably some subtle bug somewhere. I think you need to show a minimal project (with code) that displays this problem.
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      1. USAndreas Rejbrand
 

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