Question

我正在尝试从项目包之外打开MIDI文件。当文件位于分发包中时，我已经能够成功打开和读取内容。

这是我创建的用于获取文件路径的代码：

从： SetupScene.m

-(void) createFileOpenDialog {
    // Create the File Open Dialog class.
    NSOpenPanel* openDlg = [NSOpenPanel openPanel];

    // Enable the selection of files in the dialog.
    [openDlg setCanChooseFiles:YES];

    // Multiple files not allowed
    [openDlg setAllowsMultipleSelection:NO];

    // Can't select a directory
    [openDlg setCanChooseDirectories:YES];

    // Display the dialog. If the OK button was pressed,
    // process the files.
    if ([openDlg runModal] == NSModalResponseOK)
    {
        // Get an array containing the full filenames of all
        // files and directories selected.
        NSArray* urls = [openDlg URLs];

        // Loop through all the files and process them.
        for(int i = 0; i < [urls count]; i++ )
        {
            _fileNamePath = [urls objectAtIndex:i];
            _fileName = [_fileNamePath lastPathComponent];
            [_fileTextBox setText:_fileName];
            NSLog(@"Url: %@", _fileName);
        }
    }
}

在另一个类中，我从上面的代码提供的路径中打开文件：

从： MIDIParser.m

//loads the MIDI file with the song title provided by NSUserDefaults
-(void) loadSequence {
    NSString *songTitle = [[NSUserDefaults standardUserDefaults] objectForKey:@"songTitle"];
    NewMusicSequence(&_sequence);

    NSURL *midiFile = [[NSBundle mainBundle] URLForResource:songTitle withExtension:@"mid"];

    if (midiFile == nil) { //the song might have been loaded outside of the project bundle
        midiFile = [NSURL fileURLWithPath:songTitle];
    }

    MusicSequenceFileLoad(_sequence, (__bridge CFURLRef)midiFile, 0, 0);
}

在桌面上的文件上尝试此操作时，出现以下错误消息：

322: EXCEPTION (100002): "Open::fopen failed" ERROR: There are no tracks in this MIDI file.

在项目捆绑包之外打开MIDI文件

0 个答案: