Difference between revisions of "Using Python in Lazarus on Windows/Linux"
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== Files on MacOSX == | == Files on MacOSX == | ||
− | + | OSX 10.8 doesn't have Python. | |
− | Full path to | + | User needs to install Python: download Py 3.4 official pack and install it. |
+ | |||
+ | Full path to library must be set in code, I could not load it w/out path. Fixed path for 3.4 - in the code below. | ||
== App form == | == App form == |
Revision as of 21:00, 13 February 2015
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 on Windows
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>
Files on MacOSX
OSX 10.8 doesn't have Python. User needs to install Python: download Py 3.4 official pack and install it.
Full path to library must be set in code, I could not load it w/out path. Fixed path for 3.4 - in the code below.
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 set "sys.path". Only for Windows. I add paths: dir+'DLLs', dir+'python33.zip', dir+'Py' ("Py" is a special folder for my app, to put modules).
procedure TfmMain.PythonEngineAfterInit(Sender: TObject);
var
dir: string;
begin
{$ifdef windows}
dir:= ExtractFilePath(Application.ExeName);
Py_SetSysPath([
dir + 'DLLs',
dir + 'python33.zip',
dir + 'Py'
]);
{$endif}
end;
procedure Py_SetSysPath(const Dirs: array of string);
var
Str: string;
i: Integer;
begin
Str:= '';
for i:= 0 to Length(Dirs)-1 do
Str:= Str + 'r"' + 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:
const
cPyLibraryWindows = 'python33.dll';
cPyLibraryLinux = 'libpython3.4m.so.1.0';
cPyLibraryMac = '/Library/Frameworks/Python.framework/Versions/3.4/lib/libpython3.4.dylib';
procedure TfmMain.FormCreate(Sender: TObject);
var
S: string;
begin
S:=
{$ifdef windows} cPyLibraryWindows {$endif}
{$ifdef linux} cPyLibraryLinux {$endif}
{$ifdef darwin} cPyLibraryMac {$endif} ;
PythonEngine.DllPath:= ExtractFileDir(S);
PythonEngine.DllName:= ExtractFileName(S);
PythonEngine.LoadDll;
end;