为什么FOPEN获取本地方法失败归因于来自Android的NDK应用程序权限问题？ [英] Why fopen gets fail in native method due to permission issue from Android-NDK application?

问题描述

我看到下面有一个本地调用code

see i have following code in one native call

errno = 0;

FILE *fp;
fp = fopen("jigar.txt","wb");
if(fp == NULL)
    __android_log_print(ANDROID_LOG_ERROR, APPNAME, "FOPEN FAIL with %d",errno);
else
    __android_log_print(ANDROID_LOG_ERROR, APPNAME, "FOPEN pass "); 

它得到失败，并显示

which gets fail and shows

FOPEN FAIL with 30

现在这里30意味着它会显示错误

now here 30 means it shows error

#define EROFS       30  /* Read-only file system */

在我的应用程序MainFest文件我已经加入这一行

In MainFest file on my application i have added this line

 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" >

还我收到此错误。

still i am getting this error..

如何解决这个问题？

修改

由于通过指定文件夹的名称它的工作原理但

thanks by specifies folder name it works But

在我的情况我有有这样的fopen一个库（）调用，其中文件名我不能给。这需要它默认的文件名。

In my case i have one Library which has such fopen() call where file names i can not give. It takes it default filename.

，我用我的NDK应用该库中，以便在这种情况下，如何解决呢？

And i am using this Library in my ndk application so in this case how to solve this?

推荐答案

yuppi最后我得到了

yuppi finally i got that

我有没有这样

首先从/改变我的进程的当前目录/ SD卡/

first change the current directory of my process from "/" to "/sdcard/"

chdir("/sdcard/");

，然后找到关于路径/ SD卡/

and then it find path with respect to /sdcard/

和一切工作正常.. !!!

and everything WORKING..!!!

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