java Windows 7 中的 Javacv UnsatisfiedLinkError

Javacv UnsatisfiedLinkError in windows 7

提问by user1291468

In my project I want to capture image from my webcam.

在我的项目中，我想从我的网络摄像头捕获图像。

I configured step by step following the instructions from this "OpenCV-JavaCV : eclipse project configuration windows 7" blog post.

我按照这篇“OpenCV-JavaCV：eclipse project configuration windows 7”博客文章中的说明逐步配置。

After configuration is finished, i tested samples codes and the application found my webcam

配置完成后，我测试了示例代码，应用程序找到了我的网络摄像头

SETUP: Setting up device 0

SETUP：设置设备 0

SETUP: Namuga 1.3M Webcam

设置：Namuga 1.3M 网络摄像头

SETUP: Couldn't find preview pin using SmartTee

设置：无法使用 SmartTee 找到预览图钉

SETUP: Capture callback set

SETUP：捕获回调集

SETUP: Device is setup and ready to capture.

SETUP：设备已设置并准备好捕获。

and then i got an error which is .dll error.

然后我收到一个错误，即 .dll 错误。

I use windows 7 x64.

我使用 Windows 7 x64。

Exception in thread "Thread-2" java.lang.UnsatisfiedLinkError: C:\Users\Administrator\AppData\Local\Temp\javacpp153028723186\jniopencv_core.dll: Can't find dependent libraries
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary1(Unknown Source)
at java.lang.ClassLoader.loadLibrary0(Unknown Source)
at java.lang.ClassLoader.loadLibrary(Unknown Source)
at java.lang.Runtime.load0(Unknown Source)
at java.lang.System.load(Unknown Source)
at com.googlecode.javacpp.Loader.loadLibrary(Loader.java:418)
at com.googlecode.javacpp.Loader.load(Loader.java:368)
at com.googlecode.javacpp.Loader.load(Loader.java:315)
at com.googlecode.javacv.cpp.opencv_core.<clinit>(opencv_core.java:131)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at com.googlecode.javacpp.Loader.load(Loader.java:334)
at com.googlecode.javacpp.Loader.load(Loader.java:315)
at com.googlecode.javacv.cpp.opencv_core$CvArr.<clinit>(opencv_core.java:158)
at com.googlecode.javacv.VideoInputFrameGrabber.grab(VideoInputFrameGrabber.java:158)
at GrabberShow.run(GrabberShow.java:24)
at java.lang.Thread.run(Unknown Source)

How can i solve this problem?

我怎么解决这个问题？

回答by SL_User

Check whether your Opencv version and JavaCv versions are matching each other. You can check that on the readme file on javacv-bin it specifically say about the required version of the opencv.

检查您的 Opencv 版本和 JavaCv 版本是否相互匹配。您可以在 javacv-bin 上的自述文件中检查它，它专门说明了所需的 opencv 版本。

回答by karlphillip

I faced this problem on Windows XP and Windows 7, and this is how I fixed it on both platforms, using Netbeans 7.2:

我在 Windows XP 和 Windows 7 上遇到了这个问题，这就是我在两个平台上使用 Netbeans 7.2 修复它的方法：

Install all required software:

安装所有需要的软件：

• FFmpeg(32-bit shared): Zeranoe FFmpegoffers win32 builds. Download and extract ffmpeg-20121020-git-04bf2e7-win32-shared.7z. Place its content at C:\ffmpeg.

• FFmpeg（32 位共享）：Zeranoe FFmpeg提供 win32 版本。下载并解压ffmpeg-20121020-git-04bf2e7-win32-shared.7z。将其内容放在C:\ffmpeg.

Note: make sure C:\ffmpeg\binis a valid path.

注意：确保C:\ffmpeg\bin路径有效。

• OpenCV 2.4.2(32-bit): download OpenCV-2.4.2.exeand extract it. Place its content at C:\opencv.

• OpenCV 2.4.2（32 位）：下载OpenCV-2.4.2.exe并解压。将其内容放在C:\opencv.

Note: make sure C:\opencv\build\x86\vc10\binis valid path.

注意：确保C:\opencv\build\x86\vc10\bin路径有效。

• JavaCV 0.2: download javacv-0.2-bin.zipand extract it. Move the extracted folder to C:\javacv-bin.

• Microsoft Visual C++ redistributable package(32-bit): download and install vcredist_x86.exe.

• JavaCV 0.2: 下载javacv-0.2-bin.zip并解压。将解压后的文件夹移动到 C:\javacv-bin.

• Microsoft Visual C++ 可再发行组件包（32 位）：下载并安装vcredist_x86.exe。

Configure the environment:

配置环境：

• Edit the environment variable PATHand append the following paths at the end:

• 编辑环境变量 PATH并在末尾附加以下路径：

C:\ffmpeg\bin;C:\opencv\build\x86\vc10\bin

C:\ffmpeg\bin;C:\opencv\build\x86\vc10\bin

Now you ready to create a new Netbeans project and test your application. But before you compile it,dDon't forget to right-click the Librariesfolder at the pProjects window* and click Add Jar/FOLDERto select all the .jarfiles located at C:\javacv-bin.

现在您准备好创建一个新的 Netbeans 项目并测试您的应用程序。但在编译之前，d不要忘记在 pProjects 窗口* 中右键单击Libraries文件夹，然后单击添加 Jar/FOLDER以选择位于.jar 的所有.jar文件C:\javacv-bin。

回答by Thorbj?rn Ravn Andersen

Unsatisfied link means that not all native code libraries required by jniopencv_core.dll could be found.

不满意的链接意味着无法找到 jniopencv_core.dll 所需的所有本机代码库。

Did you deploy them all or just jniopencv_core.dll?

您是全部部署还是仅部署 jniopencv_core.dll？

回答by Jeff Storey

Make sure you have the vm arg -Djava.library.path=<path-to-native>that points to the directory with your dlls.

确保您拥有-Djava.library.path=<path-to-native>指向包含 dll 的目录的 vm arg 。