JavaH无法为JNI类创建C头文件
这真的让我很困惑,因为我已经尝试了关于类路径和其他各种事情的一切可能。我在windows、linux和IDE中尝试了各种不同的命令提示,但似乎没有任何帮助。总是同样的错误。任何见解都会有所帮助 尝试使用以下命令运行javah时出现以下错误:JavaH无法为JNI类创建C头文件,java,c++,class,java-native-interface,jna,Java,C++,Class,Java Native Interface,Jna,这真的让我很困惑,因为我已经尝试了关于类路径和其他各种事情的一切可能。我在windows、linux和IDE中尝试了各种不同的命令提示,但似乎没有任何帮助。总是同样的错误。任何见解都会有所帮助 尝试使用以下命令运行javah时出现以下错误: javah -jni -cp jna-3.0.9.jar:java.nio.*:java.util.* CameraInterfaceLibrary Error: Could not find class file for 'CameraInterfaceL
javah -jni -cp jna-3.0.9.jar:java.nio.*:java.util.* CameraInterfaceLibrary
Error: Could not find class file for 'CameraInterfaceLibrary'.
我真的被困在这里了。我就是不明白为什么它拒绝生成头文件。不管我做什么,它总是说找不到类文件。我只是糊涂了。我尝试过更简单的示例,但对于实际代码,它无法工作
代码如下:
import com.sun.jna.Native;
import com.sun.jna.NativeLibrary;
import com.sun.jna.Pointer;
import com.sun.jna.Structure;
import com.sun.jna.win32.StdCallLibrary;
import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.List;
/**
* JNA Wrapper for library <b>CameraInterface</b><br>
* This file was autogenerated by <a href="http://jnaerator.googlecode.com/">JNAerator</a>,<br>
* a tool written by <a href="http://ochafik.com/">Olivier Chafik</a> that <a href="http://code.google.com/p/jnaerator/wiki/CreditsAndLicense">uses a few opensource projects.</a>.<br>
* For help, please visit <a href="http://nativelibs4java.googlecode.com/">NativeLibs4Java</a> , <a href="http://rococoa.dev.java.net/">Rococoa</a>, or <a href="http://jna.dev.java.net/">JNA</a>.
*/
public class CameraInterfaceLibrary implements StdCallLibrary {
public static final String JNA_LIBRARY_NAME = "CameraInterface";
public static final NativeLibrary JNA_NATIVE_LIB = NativeLibrary.getInstance(CameraInterfaceLibrary.JNA_LIBRARY_NAME);
static {
Native.loadLibrary(CameraInterfaceLibrary.JNA_LIBRARY_NAME, CameraInterfaceLibrary.class);
}
public static class DV_TM extends Structure {
/**
* Second.interval is [0.59] * /<br>
* int tm_min; /* To the value interval [0.59]
*/
public int tm_sec;
/** Value seconds interval [0.23] */
public int tm_hour;
/** The value date of the month interval [1.31] */
public int tm_mday;
/** The value date of the month interval [1.31] */
public int tm_mon;
/** Month (from the beginning of January, o behalf of the month) value interval [0.11] */
public int tm_year;
/** Year, its value is equal to the actual year as 2010 */
public int tm_wday;
/** The value range for the week [0.6], where O stands for Sunday, 1 for Monday, and so on */
public int tm_yday;
/** Number of days from the beginning of January 1 each year ranging from [0.365], where 0 represents January 1, 1 represents January 2, and so on, can be set to 0 */
public int tm_isdst;
public DV_TM() {
super();
}
protected List<? > getFieldOrder() {
return Arrays.asList("tm_sec", "tm_hour", "tm_mday", "tm_mon", "tm_year", "tm_wday", "tm_yday", "tm_isdst");
}
/**
* @param tm_sec Second.interval is [0.59] * /<br>
* int tm_min; /* To the value interval [0.59]<br>
* @param tm_hour Value seconds interval [0.23]<br>
* @param tm_mday The value date of the month interval [1.31]<br>
* @param tm_mon The value date of the month interval [1.31]<br>
* @param tm_year Month (from the beginning of January, o behalf of the month) value interval [0.11]<br>
* @param tm_wday Year, its value is equal to the actual year as 2010<br>
* @param tm_yday The value range for the week [0.6], where O stands for Sunday, 1 for Monday, and so on<br>
* @param tm_isdst Number of days from the beginning of January 1 each year ranging from [0.365], where 0 represents January 1, 1 represents January 2, and so on, can be set to 0
*/
public DV_TM(int tm_sec, int tm_hour, int tm_mday, int tm_mon, int tm_year, int tm_wday, int tm_yday, int tm_isdst) {
super();
this.tm_sec = tm_sec;
this.tm_hour = tm_hour;
this.tm_mday = tm_mday;
this.tm_mon = tm_mon;
this.tm_year = tm_year;
this.tm_wday = tm_wday;
this.tm_yday = tm_yday;
this.tm_isdst = tm_isdst;
}
/* JR - Removed as no deemed necessary at this point
public DV_TM(com.sun.jna.Pointer peer) {
super(peer);
}*/
public static class ByReference extends DV_TM implements Structure.ByReference {
};
public static class ByValue extends DV_TM implements Structure.ByValue {
};
};
/**
* Connected devices (connect with camera)<br>
* Original signature : <code>int CConnectDV()</code><br>
* <i>native declaration : line 18</i>
*/
public static native int CConnectDV();
/**
* Disconnect the device (disconnect with camera)<br>
* Original signature : <code>int CDisconnectDV()</code><br>
* <i>native declaration : line 20</i>
*/
public static native int CDisconnectDV();
/**
* Landing equipment parameters: password (connect and open the camera parameter: password)<br>
* Original signature : <code>int CLogin(char*)</code><br>
* <i>native declaration : line 22</i><br>
* @deprecated use the safer methods {@link #CLogin(java.nio.ByteBuffer)} and {@link #CLogin(com.sun.jna.Pointer)} instead
*/
public static native int CLogin(com.sun.jna.Pointer Password);
/**
* Landing equipment parameters: password (connect and open the camera parameter: password)<br>
* Original signature : <code>int CLogin(char*)</code><br>
* <i>native declaration : line 22</i>
*/
public static native int CLogin(ByteBuffer Password);
/**
* The school parameters: see DV-TM structure (timing parameter: look at the DV-TM structure)<br>
* Original signature : <code>int CSetTime(DV_TM*)</code><br>
* <i>native declaration : line 24</i>
*/
public static native int CSetTime(CameraInterfaceLibrary.DV_TM ptm);
/**
* Read machine time parameters: see DV-TM structure (read the machine time parameter: look at the DV-TM structure)<br>
* Original signature : <code>int CGetTime(DV_TM*)</code><br>
* <i>native declaration : line 26</i>
*/
public static native int CGetTime(CameraInterfaceLibrary.DV_TM ptm);
/**
* Set password parameters: password new password 6 (set password parameter: password 6 new password)<br>
* Original signature : <code>int CSetPassword(char*)</code><br>
* <i>native declaration : line 28</i><br>
* @deprecated use the safer methods {@link #CSetPassword(java.nio.ByteBuffer)} and {@link #CSetPassword(com.sun.jna.Pointer)} instead
*/
public static native int CSetPassword(com.sun.jna.Pointer Password);
/**
* Set password parameters: password new password 6 (set password parameter: password 6 new password)<br>
* Original signature : <code>int CSetPassword(char*)</code><br>
* <i>native declaration : line 28</i>
*/
public static native int CSetPassword(ByteBuffer Password);
/**
* Set the number parameter: ID Number 13 (set ID number parameter: 13 ID number)<br>
* Original signature : <code>int CSetID(char*)</code><br>
* <i>native declaration : line 30</i><br>
* @deprecated use the safer methods {@link #CSetID(java.nio.ByteBuffer)} and {@link #CSetID(com.sun.jna.Pointer)} instead
*/
public static native int CSetID(com.sun.jna.Pointer ID);
/**
* Set the number parameter: ID Number 13 (set ID number parameter: 13 ID number)<br>
* Original signature : <code>int CSetID(char*)</code><br>
* <i>native declaration : line 30</i>
*/
public static native int CSetID(ByteBuffer ID);
/**
* Read the number parameter: ID Number 13 (read ID number parameter: 13 ID number)<br>
* Original signature : <code>int CGetID(char*)</code><br>
* <i>native declaration : line 32</i><br>
* @deprecated use the safer methods {@link #CGetID(java.nio.ByteBuffer)} and {@link #CGetID(com.sun.jna.Pointer)} instead
*/
public static native int CGetID(com.sun.jna.Pointer ID);
/**
* Read the number parameter: ID Number 13 (read ID number parameter: 13 ID number)<br>
* Original signature : <code>int CGetID(char*)</code><br>
* <i>native declaration : line 32</i>
*/
public static native int CGetID(ByteBuffer ID);
/**
* Enter the U disk mode (Enter the U disk mode)<br>
* Original signature : <code>int CIntoUDiskMode()</code><br>
* <i>native declaration : line 34</i>
*/
public static native int CIntoUDiskMode();
}
当您使用JNA时,不再需要生成C头或编译任何本机代码 使用直接映射时,声明的
native
方法会自动绑定到目标共享库中相应的方法
JNA使用方法签名和StdCall
标记接口来确定如何通过适当的类型转换将Java调用转换为本地调用
编辑
确保在静态初始值设定项中调用Native.register()
,而不是Native.loadLibrary()
。如果你已经实现了一个工作模型,请在你的问题中添加注释
您可以通过编写一个简单的
main
函数来测试执行,该函数调用一个或多个方法。当您使用JNA时,不再需要生成C头或编译任何本机代码
使用直接映射时,声明的native
方法会自动绑定到目标共享库中相应的方法
JNA使用方法签名和StdCall
标记接口来确定如何通过适当的类型转换将Java调用转换为本地调用
编辑
确保在静态初始值设定项中调用Native.register()
,而不是Native.loadLibrary()
。如果你已经实现了一个工作模型,请在你的问题中添加注释
您可以通过编写一个简单的main
函数来测试执行,该函数调用您的一个或多个方法。其他人是正确的(如果您使用JPA,则不需要javah)
但是为了彻底(以及帮助您处理Java开发中可能遇到的其他问题),我怀疑您的问题的答案是您没有正确指定类路径
以下是javah的文档:
我在命令行中看到的问题:
javah -jni -classpath C:\MyApp\Classes;C:\MyApp\lib\* com.myapp.MyAppLibrary
注意,使用通配符加载lib\文件夹中的所有jar文件。其他人是正确的(如果使用JPA,则不需要javah)
但是为了彻底(以及帮助您处理Java开发中可能遇到的其他问题),我怀疑您的问题的答案是您没有正确指定类路径
以下是javah的文档:
我在命令行中看到的问题:
javah -jni -classpath C:\MyApp\Classes;C:\MyApp\lib\* com.myapp.MyAppLibrary
注意使用通配符加载lib\文件夹中的所有jar文件。为什么要尝试为JNA映射类生成C头文件?您不需要这样做,JNA直接映射可以在编译后立即运行,而不需要本机实现。也许我没有抓住要点,但JNA是用来取代Jni的,不是吗?因此,您仍然需要生成头文件来与您想要与之接口的C/C++代码接口,因此需要引用stdcall方法和C指针,还是我完全遗漏了什么?在没有Java代码头的情况下,我如何与C/C++接口?如果要替换JNI,则不需要执行任何JNI步骤或编写任何JNIC代码。否则JNA将毫无意义。为什么要尝试为JNA映射类生成C头文件?您不需要这样做,JNA直接映射可以在编译后立即运行,而不需要本机实现。也许我没有抓住要点,但JNA是用来取代Jni的,不是吗?因此,您仍然需要生成头文件来与您想要与之接口的C/C++代码接口,因此需要引用stdcall方法和C指针,还是我完全遗漏了什么?在没有Java代码头的情况下,我如何与C/C++进行接口呢?如果您要替换JNI,则不需要经过任何