iOS中的fopen问题 [英] fopen issue in iOS

问题描述

由于某些原因的fopen给出了错误没有这样的文件或目录尽管我已经转换路径的文件路径。

For some reason fopen gives the error No such file or directory even though I have converted the path to the documents path.

NSString *docsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *filePath = [docsPath stringByAppendingPathComponent:filename];

我通过使用 UTF8字符串方法，只以阅读方式打开与

I pass the NSString using the UTF8String method and only open in read mode with

if ((fh=fopen(filename, "r+b")) == NULL){
    perror("fopen");
    return -1;
}

下面的完整路径打印出来试图打开文件名时（我删除了应用的实际目录名称的确切值）

The following full path is printed out when trying to open the filename(I removed the exact values for the applications actual dir name)

在/ var /移动/应用/ ##### /文档/ testImages.pak

/var/mobile/Applications/#####/Documents/testImages.pak

为什么不FOPEN检测文件？我把它添加到目标，甚至试图改变文件检查器中的位置设置为相对于集团和相对于项目

Why would fopen not detect the file? I have added it to the target and even tried changing the location settings in the file inspector to Relative to Group and Relative to Project

推荐答案

您必须使用下面的方法到的NSString转换为一个char *，否则将无法正确映射到文件系统。

You have to convert the NSString to a char* using the following method, or it will not properly map to the file system.

    char const *path_cstr = [fileManager fileSystemRepresentationWithPath:pathString];

现在你可以直接的fopen使用它（）。

Now you can use it directly in fopen().

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