Android JNI/NDK C++代码读写手机上存放的文件

我就是我 2023-09-27 19:14 104阅读 0赞

（1）首先确保当前app已经获得读文件系统的权限：

<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE"/>

需要动态运行时获取一次。

（2）在Android的native C++代码里面，就可以读手机上的文件，根据手机存储路径：

#include <sys/stat.h>
    
    size_t getFileSize(const char *path){
        struct stat statbuf;
        stat(path, &statbuf);
        return statbuf.st_size;
    }
    
    //手机上存储文件的绝对路径
    const char *path="/storage/emulated/0/具体/文件/路径/xxx.xxx";
    
    void read_file(){
        FILE *file;
        file = fopen(path, "r");
        if (file != NULL) {
            //读文件成功"
            getFileSize(model_path)/1024;
            fclose(file);
        } else {
            //"读文件失败"
        }
    }

[https://zhangphil.blog.csdn.net/article/details/130423157![icon-default.png_t_N3I4][]https://zhangphil.blog.csdn.net/article/details/130423157][https_zhangphil.blog.csdn.net_article_details_130423157_icon-default.png_t_N3I4_https_zhangphil.blog.csdn.net_article_details_130423157]

[https://zhangphil.blog.csdn.net/article/details/130207425![icon-default.png_t_N3I4][]https://zhangphil.blog.csdn.net/article/details/130207425][https_zhangphil.blog.csdn.net_article_details_130207425_icon-default.png_t_N3I4_https_zhangphil.blog.csdn.net_article_details_130207425]

[icon-default.png_t_N3I4]: https://csdnimg.cn/release/blog_editor_html/release2.2.5/ckeditor/plugins/CsdnLink/icons/icon-default.png?t=N3I4
[https_zhangphil.blog.csdn.net_article_details_130423157_icon-default.png_t_N3I4_https_zhangphil.blog.csdn.net_article_details_130423157]: https://zhangphil.blog.csdn.net/article/details/130423157
[https_zhangphil.blog.csdn.net_article_details_130207425_icon-default.png_t_N3I4_https_zhangphil.blog.csdn.net_article_details_130207425]: https://zhangphil.blog.csdn.net/article/details/130207425