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POHow to notify Python from an Inno Setup that the environment path has changed?
 

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  1. POHow to notify Python from an Inno Setup that the environment path has changed?
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    <p>So I'm trying to create an installer that has the following steps:</p> <ol> <li>Check if Python is installed</li> <li>Copy my app files</li> <li>Check if the Python install directory is in the Windows Environment Path</li> <li>Check if the Python scripts folder is in the Windows Environment Path</li> <li><strong>If the scripts folder is not in the env path, add it</strong></li> <li><strong>install easy_install</strong></li> <li><strong>run a python script that uses easy_install to install several libraries</strong></li> </ol> <p>The problem is encountered in the last few steps. Here is the relevant code for the Inno setup I am currently using:</p> <pre><code>begin case CurStep of ssInstall: // File transfer is about to begin. begin // Note: Use abort(); to terminate the install during this step. end; ssPostInstall: // File transfer has finished. begin // Make sure Python is in the path. sPythonInstallDir := _PythonGetInstallDir(); _PathAddToSystem( sPythonInstallDir ) _PathAddToSystem( sPythonInstallDir + 'Scripts;' ) // Run the bundled Python script. ExtractTemporaryFile( 'build_setup_script.py' ); ExtractTemporaryFile( 'ez_setup.py' ); _LaunchApp( AddQuotes( sPythonInstallDir + 'python.exe' ), AddQuotes( ExpandConstant( '{tmp}\build_setup_script.py' ) ), ExpandConstant( '{tmp}' ), SW_SHOW, ewWaitUntilTerminated, 300, nTime, nResultCode ); end; ssDone : // After the Finish dialog. begin end; end; </code></pre> <p>here is the python script:</p> <pre><code>def main(argv): ## Easy Install print("Installing easy_install") call(["Python", "ez_setup.py"]) ... ## Installs server.py dependencies print("\nInstalling SQLAlchemy") call(["easy_install", "SQLAlchemy==0.7.8"]) ... </code></pre> <p>In the inno setup I also have the following directive</p> <pre><code>[Setup] ... ChangesEnvironment=true ... </code></pre> <p>however, according to this <a href="https://stackoverflow.com/questions/12550791/innosetup-sendmessage-after-changing-the-environment-values">post</a>, the directive only takes effect after the user clicks finish.</p> <p>So the setup appends to the path:</p> <pre><code>...C:\Program Files (x86)\Git\cmd;;C:\Python27\;C:\Python27\Scripts; </code></pre> <p>but, then the script runs (which works because inno seems to be aware that the path has changed and can execute Python files) the script will then install easy_install, which works for some reason, but when it tries to use easy_install (which is why the C:Python\Scripts; is in the path) it throws a file not found exception. </p> <p>However, when I run the installer a second time, without making any changes, the easy_install steps will then work because now when Python runs, it can detect the path to easy_install.</p> <p>I figure there has to be a way to notify processes prior to clicking finish, however copying the code in the aforementioned <a href="https://stackoverflow.com/questions/12550791/innosetup-sendmessage-after-changing-the-environment-values">post</a> doesn't even compile in inno</p> <pre><code>SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0, LPARAM(PChar('Environment')), SMTO_ABORTIFHUNG, 5000, MsgResult); </code></pre> <p>Asking the user to start the install a second time is out of the question since the installer should be automated in the first place... any ideas?</p>
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