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call java compiler from my delphi application

Posted on 2004-04-08
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Last Modified: 2010-04-05
hello
how to call the java compiler to compile the text that in a text area in my application in delphi?
and how can i get the errors log file?
thx
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Question by:mis82
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11 Comments
 
LVL 11

Expert Comment

by:shaneholmes
ID: 10784115
You will need to call the Java compiler using the ShelLExecute - passing it the command line parameters.

javac [ options ] [ sourcefiles ] [ @argfiles ]



procedure TForm1.Button1Click(Sender: TObject);
var
  App: Pchar;
  Parameters: Pchar;
  MyHandle: Hwnd;
  Directory: Pchar;
begin
  MyHandle := Application.Handle;  {Could be Form1.Handle}
  App := 'Javac';  {Any application you want to run}
  Parameters := [[ options ] [ sourcefiles ] [ @argfiles ]} {Whatever params you need here}
  Directory := 'C:\Java\';  { the directory of the app}
  ShellExecute(MyHandle,nil, App, Parameters, Directory , SW_SHOWMINNOACTIVE);
end;

Shane
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LVL 17

Expert Comment

by:geobul
ID: 10784119
Hi,

What I would do:

1. Save the text in a file (something like: RichEdit1.Lines.SaveToFile('SourceFileName'); if your text area is rich edit control)

2. Call your (command line?) compiler passing all necessary parameters including the source file and a file for errors:

function ExecApplication(APPName, CmdLine: String; ShowMode: DWord; WaitToExit: Boolean): DWord;
var StartInfo: TStartupInfo;
  ProcInfo: TProcessInformation;
begin
  FillChar(StartInfo, SizeOf(StartInfo), 0);
  StartInfo.cb:=SizeOf(StartInfo);
  StartInfo.dwFlags:=STARTF_USESHOWWINDOW;
  StartInfo.wShowWindow:=ShowMode;
  if AppName<>''
    then CreateProcess(PChar(APPName), PChar(CmdLine), nil, nil, False, 0,
                       nil, nil, StartInfo, ProcInfo)
    else CreateProcess(nil, PChar(CmdLine), nil, nil, False, 0,
                       nil, nil, StartInfo, ProcInfo);
  if WaitToExit
    then WaitForSingleObject(ProcInfo.hProcess, INFINITE);
  GetExitCodeProcess(ProcInfo.hProcess, Result);
  CloseHandle(ProcInfo.hProcess);
  CloseHandle(ProcInfo.hThread);
end;

// usage:
ExecApplication('', 'your command line with parameters here', SW_SHOWNORMAL, true);

3. Load the errors log in another TMemo or TRichEdit control:
RichEdit2.Lines.LoadFromFile('LogFileName');

Regards, Geo
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LVL 11

Expert Comment

by:shaneholmes
ID: 10784132

Oops sorry, i didn't see this

"compile the text that in a text area in my application "

if its in a memo, save it to file first

 Memo1.Lines.SaveToFile....


Then use the code above to execute and compile that file

If its not in a Memo, create aTStringList, add the text to that, and then call its SaveToFile

Shane

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LVL 3

Expert Comment

by:Aliev
ID: 10784895
Dear experts you forget one situation.
If source file contains error and any warnings your programs will not work.
You need get compiler warnings, hints , errors etc.
I have created procedure for compiling and getting result with Pascal Compiler because i have not Java. But idea is same. You can change and make it for java compiler.

procedure TForm1.Run1Click(Sender: TObject);
var
fname:string;
sDir: String;
erri: Integer;
begin
   
    memo1.Lines.SaveToFile(sdir+'\compiler\ce.PAS');   //saves your file to file.pas
    shellexecute(handle,'Open',pchar(sdir+'\compiler\BPC.EXE'),pchar(sdir+'\compiler\ce.PAS >'+sdir+'\compiler\CE.ERR'),pchar(sdir+'\compiler\'),0);
    //executes compiler and saves compiler results(hints,warnings and errors) to ce.err file
   
    if fileexists(sdir+'\compiler\CE.ERR') then begin
   

    listbox1.Items.LoadFromFile(sdir+'\compiler\CE.ERR');      // loads compiler results(hints,warnings and errors) to Listbox1
   
    listbox1.ItemIndex:=listbox1.Items.Count-1;      //scrools listbox1 down
   
   
    end;
   
   
end;



All is fine. If your HDD`s speed is low or your file system not works quick you will be problems on opening err file.

Best regards, Adil Aliev
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LVL 11

Expert Comment

by:shaneholmes
ID: 10785128
I am told that the compiler sends error messages to the standard ERROR
STREAM and NOT to the standard OUTPUT STREAM.


see this link for 'Capture the output from a DOS Command'

http://delphi.about.com/cs/adptips2001/a/bltip0201_2.htm

Stderror is not assigned in that exmample but, just add something like this to test it:

  .
  .
  .
   {start.cb          := SizeOf(start);
   start.hStdOutput  := WritePipe;
   start.hStdInput   := ReadPipe;}

   start.hStdError := WritePipe;   // add this line, or create another pipe

for the errror messages
   start.dwFlags     := STARTF_USESTDHANDLES +
   .



Shane
0
 
LVL 17

Expert Comment

by:geobul
ID: 10789600
If the compiler can write the results of comiling to a file and you pass the correct command line then my example will work while Aliev's won't. It doesn't matter how fast is your computer. ShellExecute doesn't wait for the started program to finish so you'll either not find the results file or open an old one (from a previous compilation).
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LVL 3

Expert Comment

by:Aliev
ID: 10790603
geobul, I said that because i had this problem.
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Author Comment

by:mis82
ID: 10816734
Hello;
i got an error after running the application(Could not find the main class)
i think the error in the parameter  i think the syntax is error in shaneholmes code(in parameter line)
acctually i dont know how to use the pararmeter
anybody can help ???    and what about the error log for java?
thanks all
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