Using Python in Lazarus on Windows/Linux
Intro
I need to make app, cross platform, Win/Linux, which embeds Python engine. I tried Python4Delphi, but it doesn't compile and work on Linux x64. Same app must run on Win and Linux, must use portable Python 3 on Win and system Python 3 on Linux.
Result
Links
Work on Ubuntu 14.04 x64
Work on Windows7 x64
Modify P4D
Package "p4dlaz.lpk": delete all refs to units "...Delphi...". (Maybe units aren't needed for Lazarus apps.) Make modifications to PythonEngine.pas, see lines with "//AT". Compile and use package. You must see "Python" tab appeared in component pallette.
App
Files needed
On Windows you need to copy files to app folder. From "Sublime Text 3" installation for win, take Python files and copy them to app folder:
- python33.dll
- msvcr100.dll
- python33.zip
- .pyd files to folder DLLs
Manifest on Windows: "appname.exe.manifest":
<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0"> <noInheritable/> <assemblyIdentity type="win32" name="DelphiApplication" version="1.0.0.0" processorArchitecture="*"/> <dependency> <dependentAssembly> <assemblyIdentity type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='*' publicKeyToken='6595b64144ccf1df' language='*' /> </dependentAssembly> </dependency> <trustInfo xmlns="urn:schemas-microsoft-com:asm.v3"> <security> <requestedPrivileges> <requestedExecutionLevel level='asInvoker' uiAccess='false' /> </requestedPrivileges> </security> </trustInfo> </assembly>
App form
Put on form:
- TPythonEngine
- TPythonInputOutput
- TCombobox (edConsole)
- TMemo (memoConsole)
Props of PythonEngine:
- AutoLoad=False
- DllName empty
- DllPath empty
- FatalAbort=False
- InitScript="import sys; print('Python', sys.version)"
- IO=PythonInputOutput1
- PyFlags=[pfIgnoreEnvironmentFlag]
- UseLastKnownVersion=False
Event handlers
- PythonEngine.OnAfterInit: must add paths to "sys.path". Must do only for Windows, for portable Python, don't do for Linux. I add paths: dir+'DLLs', dir+'python33.zip', dir+'Py' (dir is ExtractFilePath(Application.ExeName)).
procedure TfmMain.PythonEngineAfterInit(Sender: TObject); var SDir, S1, S2, S3: string; begin {$ifdef windows} SDir:= ExtractFilePath(Application.ExeName); S1:= SDir + 'DLLs'; S2:= SDir + 'python33.zip'; S3:= SDir + 'Py'; Py_SetSysPath([S1, S2, S3]); {$endif} end;
procedure Py_SetSysPath(const Dirs: array of string); var Str: AnsiString; i: Integer; begin Str:= ; for i:= 0 to Length(Dirs)-1 do Str:= Str + SWideStringToPythonString(Dirs[i]) + ','; Str:= Format('sys.path = [%s]', [Str]); GetPythonEngine.ExecString(Str); end;
- PythonInputOutput.OnSendData, OnSendUniData:
procedure TfmMain.PythonInputOutput1SendData(Sender: TObject; const Data: AnsiString); begin memoConsole.Lines.Add(Data); end;
procedure TfmMain.PythonInputOutput1SendUniData(Sender: TObject; const Data: UnicodeString); begin memoConsole.Lines.Add(Data); end;
- edConsole.OnKeyPress:
procedure TfmMain.edConsoleKeyPress(Sender: TObject; var Key: char); var Str: string; begin if Key=#13 then begin Str:= edConsole.Text; //support entering "=some cmd" if (Str<>) and (Str[1]='=') then Str:= 'print('+Copy(Str, 2, MaxInt) + ')'; memoConsole.Lines.Add('>>> '+Str); edConsole.Text:= ; edConsole.Items.Insert(0, Str); try GetPythonEngine.ExecString(Str); except end; end; end;
- main form OnCreate:
procedure TfmMain.FormCreate(Sender: TObject); begin {$ifdef windows} PythonEngine.DllName:= 'python33.dll'; {$endif} {$ifdef linux} PythonEngine.DllName:= 'libpython3.4m.so.1.0'; {$endif} PythonEngine.LoadDll; end;