小编nmn*_*nir的帖子

我正在尝试从我的本机代码中读取一个简单的文本文件.

1. 我把file.txt放在assets文件夹下

2. 在我的活动中,我正在创建资产管理器:assetManager = getAssets(); 然后我将assetManager传递给我的本机方法(如本机音频示例中所示):

   AAssetManager* mgr = AAssetManager_fromJava(env, assetManager);
   AAsset* asset = AAssetManager_open(mgr, "file.txt", AASSET_MODE_UNKNOWN);
   AAssetManager* mgr = AAssetManager_fromJava(env, assetManager);
   
   off_t start, length;
   
   int fd = AAsset_openFileDescriptor(asset, &start, &length);   
   

   Run Code Online (Sandbox Code Playgroud)

问题是fd小于0 !!!

任何人都可以帮忙吗？

我有错误：uiview类型的值没有成员大小。这是我的代码：

if let nv = (AppDelegate.getAppDelegate().window?.rootViewController as? UINavigationController) {

        let pushedViewControllers = nv.viewControllers
        let presentedViewController:UIViewController = pushedViewControllers[pushedViewControllers.count - 1]
        UIGraphicsBeginImageContext(presentedViewController.view.size()) //HERE IS THE ERROR

检查了h文件，UIViewController具有公共var视图：UIView！谢谢！

我正在尝试编译这个例子

在Ubunto上.这是编译命令:

    g++ video.cpp -o video `pkg-config --cflags opencv` `pkg-config --libs opencv` -lpthread -lavutil -lavformat -lavcodec -lz

这是我得到的错误:

     /usr/local/include/libavutil/common.h:173:47: error: ‘UINT64_C’ was not declared in this scope
     video.cpp: In member function ‘int FFread::init(char*)’:
     video.cpp:24:56: error: ‘av_open_input_file’ was not declared in this scope
     video.cpp:28:5: warning: ‘int av_find_stream_info(AVFormatContext*)’ is deprecated      (declared at /usr/local/include/libavformat/avformat.h:1266) [-Wdeprecated-declarations]
     video.cpp:28:35: warning: ‘int av_find_stream_info(AVFormatContext*)’ is deprecated (declared at /usr/local/include/libavformat/avformat.h:1266) [-Wdeprecated-declarations]
     video.cpp:32:36: error: ‘dump_format’ was not declared in this scope
     video.cpp:37:48: error: ‘CODEC_TYPE_VIDEO’ was not declared in this …

我正在使用ndk 5并且样本构建正常.但是在我添加行的项目中 #include <SLES/OpenSLES.h> 它给出了编译错误,没有这样的文件或目录.除了源文件名之外,我的Android.mk与原生音频完全相同.

问题是什么？谢谢,Nahum