Question

我是Objective-c的新手。我参加了python和c ++课程，但我对objective-c非常感兴趣所以我在过去的几天里一直在努力学习。该程序应该比较两个位置的文件并添加缺失的文件。虽然目前尚未实现所有功能，但是简单的同步。

错误来自recursivelyGetContentsOfDirectory函数。它返回错误EXEC_BAD_ACCESS。因为它实际上不在函数中，所以我假设它与它的定义有关。

   #import <AppKit/AppKit.h>

@interface Sync : NSControl{
    NSURL *baseToDirectory;
    NSURL *baseFromDirectory;

    NSArray *filesInBaseFromDirectory;

    IBOutlet NSTextField *baseToDirectoryLabel;
    IBOutlet NSTextField *baseFromDirectoryLabel;
}
- (IBAction)chooseBaseSyncFromDirectory:(id)sender;
- (IBAction)chooseBaseSyncToDirectory:(id)sender;
- (IBAction)performSync:(id)sender;

void recursivelyGetContentsOfDirectory (NSURL *path);

@end

实施档案

#import "Sync.h"

@implementation Sync


- (IBAction)chooseBaseSyncFromDirectory:(id)sender {

    NSOpenPanel* openDlg = [NSOpenPanel openPanel];
    [openDlg setCanChooseDirectories:YES];
    [openDlg setCanChooseFiles:NO];
    //Open the directory
    if ([openDlg runModal] == NSFileHandlingPanelOKButton) {
        NSArray *files = [openDlg URLs];
        NSString *fileAsString = [[files objectAtIndex:0] path];
        [baseFromDirectoryLabel setStringValue:fileAsString];
        baseFromDirectory = [files objectAtIndex:0];
        recursivelyGetContentsOfDirectory(baseFromDirectory);
    }
}

- (IBAction)chooseBaseSyncToDirectory:(id)sender {
    NSOpenPanel* openDlg = [NSOpenPanel openPanel];
    [openDlg setCanChooseDirectories:YES];
    [openDlg setCanChooseFiles:NO];

    if ([openDlg runModal] == NSFileHandlingPanelOKButton) {
        NSArray *files = [openDlg URLs];
        NSString *fileAsString = [[files objectAtIndex:0] path];
        [baseToDirectoryLabel setStringValue:fileAsString];
        baseToDirectory = [files objectAtIndex:0];
    }
}

void recursivelyGetContentsOfDirectory (NSURL *path){
    NSFileManager *tempManager;
    NSArray *contentsOfDirectory = [tempManager contentsOfDirectoryAtPath:[path path] error:nil];
    for (int i = 0; i < (int)[contentsOfDirectory count] ; i = i+1) {
        if ([[contentsOfDirectory objectAtIndex:i] isDirectory]) {
            NSString *next = [NSString stringWithString:[path path]];
            [next stringByAppendingString:[contentsOfDirectory objectAtIndex:i]];
            NSURL *nextPath = [NSURL URLWithString:next];
            recursivelyGetContentsOfDirectory(nextPath);
        } else {
            NSLog(@"Non-Directory Found");
        }
    }
}

- (IBAction)performSync:(id)sender {

}

@end

Answer 1

NSFileManager *tempManager;

您没有创建tempManager

它应该像

NSFileManager *tempManager=[[NSFileManager alloc] init];

如果您不使用ARC，则负责（自动）释放tempManager。

或使用NSFileManager *tempManager = [NSFileManager defaultManager]

访问不良的Objective-C方法

1 个答案: