File open not working on MacOs

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Rohit Agarwal
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File open not working on MacOs

Post by Rohit Agarwal » Wed May 19, 2021 11:25 pm

I'm running MacOS BigSur 11.1
on a MacMini M1 (2020).

I am using a static build (configure --disable-shared)

The following code fails to open a file for writing.
Similar code to open a file for reading also fails.
I tried filename::Exists(). That fails too for a file that visibly exists.
Then I tried this code.
The code runs, nothing gets created.
I'm running this as an Admin, so permissions should not be an issue.

Code: Select all

#include "wx/wxprec.h"
#include "wx/wx.h"
#include "wx/ffile.h"
#include "wx/filename.h"
#include "wx/log.h"

class MyApp : public wxApp
{
public:
  virtual bool OnInit() wxOVERRIDE;
  virtual int OnExit() wxOVERRIDE { return 0; }
};
wxIMPLEMENT_APP(MyApp);

bool MyApp::OnInit()
{
  if ( !wxApp::OnInit() )
    return false;

  wxFFile *file = new wxFFile();
  unsigned char ucBuffer[22];
  
  file->Open("test", "w");
  file->Write( ucBuffer, 22 );
  file->Close();
  return true;
}
Last edited by doublemax on Thu May 20, 2021 5:11 am, edited 1 time in total.
Reason: Added code tags

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doublemax
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Re: File open not working on MacOs

Post by doublemax » Thu May 20, 2021 9:23 am

I can't test under OSX, but i think the most likely reason is that you're not specifying a path, so the code will probably try to create the while where the executable lies. Maybe that doesn't work?

For testing, try another absolute path, or use wxFileDialog to get one at runtime, and create the file there.
Use the source, Luke!

Rohit Agarwal
Knows some wx things
Knows some wx things
Posts: 42
Joined: Wed May 19, 2021 11:17 pm
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Re: File open not working on MacOs

Post by Rohit Agarwal » Mon Jul 05, 2021 1:52 pm

I got it to work.
Using wxFileDialog, I determined the exact path it was using in its return value.
Then I used that exact path to open the file and it worked.

PB
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Re: File open not working on MacOs

Post by PB » Tue Jul 06, 2021 3:14 pm

Regardless of the OS, using just a file name is generally a bad idea, as this depends on the current working directory and is rather brittle.

If you do not have a path from the user, you can use wxStandardPaths to obtain a path to a known location:
https://docs.wxwidgets.org/trunk/classw ... paths.html

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