[issue31172] Py_Main() is totally broken on Visual Studio 2017
New submission from Patrick Rutkowski: Install Visual Studio 2017 Download and unpack Python-3.6.2.tgz Open a Visual Studio command prompt Browse to Python-3.6.2\PCBuild Run build.bat -p x64 -c Release Run build.bat -p x64 -c Debug Add the PCbuild\amd64 directory to your PATH Create a new Visual Studio Win32 GUI project called mypythonw Copy-paste the source code of Python-3.6.2\PCBuild\WinMain.c into your mypthonw project. Add Python-3.6.2\Include and Python-3.6.2\PC to mypythonw's include path. Add Python-3.6.2\PCbuild\amd64 to mypythonw's library search path Build mypthonw Run these two commands: pythonw -c "import ctypes; ctypes.windll.user32.MessageBoxW(0, 'Hello World!', 'Hello', 0) mypythonw -c "import ctypes; ctypes.windll.user32.MessageBoxW(0, 'Hello World!', 'Hello', 0) The first will show a message box, while the second will show nothing. You won't get an error message or a debugger from mypythonw.exe. It'll just silently do nothing. There must be something in the configuration of pythonw.vcxproj that is necessary for Python embedding to work, and which makes it work in pythonw but fail in mypythonw. The two projects are executing the exact same C code, but one works and the other doesn't. What's going on here? -- messages: 300055 nosy: rutski priority: normal severity: normal status: open title: Py_Main() is totally broken on Visual Studio 2017 ___ Python tracker <http://bugs.python.org/issue31172> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue31172] Py_Main() is totally broken on Visual Studio 2017
Patrick Rutkowski added the comment:
Just for kicks I tried the same Py_Main() code from a Win32 console application
(instead of from a GUI application). The C code this time was
#include
int wmain(int argc, wchar_t** argv) {
return Py_Main(argc, argv);
}
The resulting error message when trying to run the program is now
===
> mypythoncmd.exe -c "import ctypes; ctypes.windll.user32.MessageBoxW(0, 'Hello
> World!', 'Hello', 0)"
Fatal Python error: Py_Initialize: unable to load the file system codec
ModuleNotFoundError: No module named 'encodings'
Current thread 0x09f0 (most recent call first):
OUTPUT ENDS HERE
===
--
assignee: -> christian.heimes
components: +SSL
nosy: +christian.heimes
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[issue31172] Py_Main() is totally broken on Visual Studio 2017
Patrick Rutkowski added the comment: I removed my custom built Python and installed the one provided by the python-3.6.2-amd64.exe installer instead. The Win32 Command Line application now works, and shows the message box. The Win32 GUI Application still fails to work, the output is just nothing. As expected, pythonw works as always, it shows the popup. -- ___ Python tracker <http://bugs.python.org/issue31172> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
