JNA:java.lang.Error:内存访问无效-TS3库
我使用JNA从Java访问一些dll函数,该dll本机函数声明如下:JNA:java.lang.Error:内存访问无效-TS3库,java,jna,Java,Jna,我使用JNA从Java访问一些dll函数,该dll本机函数声明如下: unsigned int ts3client_initClientLib(const struct ClientUIFunctions* functionPointers, const struct ClientUIFunctionsRare* functionRarePointers, int usedLogTypes, const char* logFileFolder, const char* resourcesFold
unsigned int ts3client_initClientLib(const struct ClientUIFunctions* functionPointers, const struct ClientUIFunctionsRare* functionRarePointers, int usedLogTypes, const char* logFileFolder, const char* resourcesFolder);
int ts3client_initClientLib(Structure functionPointers, Structure functionRarePointers, int usedLogTypes, String logFileFolder, String resourcesFolder);
因此,我在库接口中声明如下:
unsigned int ts3client_initClientLib(const struct ClientUIFunctions* functionPointers, const struct ClientUIFunctionsRare* functionRarePointers, int usedLogTypes, const char* logFileFolder, const char* resourcesFolder);
int ts3client_initClientLib(Structure functionPointers, Structure functionRarePointers, int usedLogTypes, String logFileFolder, String resourcesFolder);
然后我用下面的方式来称呼它:
ts3client_initClientLib(null, null, 1, "log.log", "soundbackends");
但我得到了以下例外:
Exception in thread "main" java.lang.Error: Invalid memory access
at com.sun.jna.Native.invokeInt(Native Method)
at com.sun.jna.Function.invoke(Function.java:383)
at com.sun.jna.Function.invoke(Function.java:315)
at com.sun.jna.Library$Handler.invoke(Library.java:212)
at com.sun.proxy.$Proxy0.ts3client_initClientLib(Unknown Source)
at pl.edu.tirex.ts3musicbot.MusicBot.main(MusicBot.java:17)
正确的解决方案:
创建事件接口:
import com.sun.jna;
public interface ServerErrorEvent implements Callback
{
void invoke(long serverConnectionHandlerID, String errorMessage, int error, String returnCode, String extraMessage);
}
创建客户端UI功能结构:
import com.sun.jna.Structure;
public class EventsStructure extends Structure
{
public ServerErrorEvent onServerErrorEvent;
@SuppressWarnings("rawtypes")
@Override
protected List<String> getFieldOrder()
{
List<String> fields = new ArrayList<String>();
for (Field f : this.getClass().getDeclaredFields())
{
boolean has = false;
for (Class<?> c : f.getType().getInterfaces())
{
if (c.equals(DefaultEvent.class))
{
has = true;
}
}
if (has)
{
fields.add(f.getName());
}
}
return fields;
}
}
正确的解决方案:
创建事件接口:
import com.sun.jna;
public interface ServerErrorEvent implements Callback
{
void invoke(long serverConnectionHandlerID, String errorMessage, int error, String returnCode, String extraMessage);
}
创建客户端UI功能结构:
import com.sun.jna.Structure;
public class EventsStructure extends Structure
{
public ServerErrorEvent onServerErrorEvent;
@SuppressWarnings("rawtypes")
@Override
protected List<String> getFieldOrder()
{
List<String> fields = new ArrayList<String>();
for (Field f : this.getClass().getDeclaredFields())
{
boolean has = false;
for (Class<?> c : f.getType().getInterfaces())
{
if (c.equals(DefaultEvent.class))
{
has = true;
}
}
if (has)
{
fields.add(f.getName());
}
}
return fields;
}
}
最有可能的是,目标函数想要一个非空结构,其中包含给它一个空指针的回调。最有可能的是,目标函数想要一个非空结构,其中包含给它一个空指针的回调。最有可能的是,目标函数想要一个非空结构,其中包含给它一个空指针的回调它是一个空指针。