有关Objective c 使用文件问题

int main(int argc, char * argv[])

{

    @autoreleasepool

    {

        // 获取主目录，ios app 只能在这里创建删除文件

        NSString *strPath = NSHomeDirectory()

        

        // 模拟器会显示这个路径

        // /Users/xxx/Library/Application Support/iPhone Simulator/7.1/Applications/82BD6DF8-0E94-4C73-B7E0-A4A0ED7C80E9

        // 在桌面选择菜单上的 -> 前往 -> 前往文件夹 -> 输入这个路径就可以看到里面的文件

        // 里面目录的作用可以搜索（ios沙盒机制）学习

        NSLog(@"%@",strPath)

        

        // 设置要创建文件的路径

        NSString *strTxtPath= [strPath stringByAppendingPathComponent:@"test.txt"]

        

        // 创建这个文件

        NSFileManager *fileManager = [NSFileManager defaultManager]

        [fileManager createFileAtPath:strTxtPath contents:nil attributes:nil]

        

        // YES

        // 可以看到 test.txt 文件

        if ([fileManager fileExistsAtPath:strTxtPath])

        {

            NSLog(@"YES")

        }

        else

        {

            NSLog(@"NO")

        }

        

    }

    return 0

}

方法：通过NSHomeDirectory获得文件路径

代码如下：

NSString *homeDirectory = NSHomeDirectory()

NSString *fileDirectory = [homeDirectory stringByAppendingPathComponent:@"temp/app_data.plist"]

1.//使用NSSearchPathForDirectoriesInDomains检索指定路径

NSArray *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)

NSString *documentsDirectory = [paths objectAtIndex:0]z

NSString *fileDirectory = [documentsDirectory stringByAppendingPathComponent:@"file.txt"]

2.//使用Foundation中的NSTemporaryDirectory函数直接返回代表temp文件夹的全路径的字符串对象

NSString *tempDirectory = NSTemporaryDirectory()

NSString *file = [tempDirectory stringByAppendingPathComponent:@"file.txt"]

实现例子如下:

NSArray *path = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES)

NSString *docDir = [path objectAtIndex:0]

NSLog(@"filepath:%@",docDir)

NSString *str = @"hello.jpg"

NSString *filepath = [docDir stringByAppendingPathComponent:str]

//NSString *filepath = [docDir stringByAppendingPathComponent:[NSString stringWithUTF8String:"///mest.txt"]]

NSLog(@"filepath:%@",filepath)

BOOL success = [[NSFileManager defaultManager]createFileAtPath: filepath contents:nil attributes:nil]

NSLog(@"result",success)

printf("Create File:%s %s.",[filepath UTF8String], success ? "Success" : "Error")

NSString* reValue= [NSString stringWithString:@"\\"success\\""]

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