private void AttachToCurrentJVM(JavaVMInitArgs args)
{
// This is only required if you want to reuse the same instance of the JVM
// This is especially useful if you are using JNI in a webservice. see page 89 of the
// Java Native Interface: Programmer's Guide and Specification by Sheng Liang
if (AttachToCurrentJVMThread)
{
int nVMs;
IntPtr javaVirtualMachine;
int res = JavaVM.JNI_GetCreatedJavaVMs(out javaVirtualMachine, 1, out nVMs);
if (res != JNIReturnValue.JNI_OK)
{
throw new Exception("JNI_GetCreatedJavaVMs failed (" + res.ToString() + ")");
}
if (nVMs > 0)
{
jvm = new JavaVM(javaVirtualMachine);
res = jvm.AttachCurrentThread(out env, args);
if (res != JNIReturnValue.JNI_OK)
{
throw new Exception("AttachCurrentThread failed (" + res.ToString() + ")");
}
}
}
}
public int AttachCurrentThreadAsDaemon(out JNIEnv penv, JavaVMInitArgs?args)
{
if (_attachCurrentThreadAsDaemon == null)
{
GetDelegateForFunctionPointer(_functions.AttachCurrentThreadAsDaemon,
ref _attachCurrentThreadAsDaemon);
}
IntPtr env;
int result;
if (!args.Equals(null))
{
JavaVMInitArgs value = args.Value;
result = _attachCurrentThreadAsDaemon.Invoke(_jvm, out env, &value);
}
else
{
result = _attachCurrentThreadAsDaemon.Invoke(_jvm, out env, null);
}
if (result == JNIReturnValue.JNI_OK)
{
penv = new JNIEnv(env);
}
else
{
penv = null;
}
return(result);
}
public void LoadVM(Dictionary <string, string> options)
{
string currentDir = Directory.GetCurrentDirectory();
string jvmDll = Path.Combine("jre", "bin", "server", "jvm.dll");
if ((!File.Exists(jvmDll)))
{
throw new Exception("Error determining the location of the Java Runtime Environment");
}
// Set the directory to the location of the JVM.dll.
// This will ensure that the API call JNI_CreateJavaVM will work
Directory.SetCurrentDirectory(Path.GetDirectoryName(jvmDll));
var args = new JavaVMInitArgs();
args.version = JNIVersion.JNI_VERSION_10;
args.ignoreUnrecognized = JavaVM.BooleanToByte(true); // True
if (options.Count > 0)
{
args.nOptions = options.Count;
var opt = new JavaVMOption[options.Count];
int i = 0;
foreach (KeyValuePair <string, string> kvp in options)
{
opt[i++].optionString = Marshal.StringToHGlobalAnsi(kvp.Key.ToString() + "=" + kvp.Value.ToString());
}
fixed(JavaVMOption *a = &opt[0])
{
// prevents the garbage collector from relocating the opt variable as this is used in unmanaged code that the gc does not know about
args.options = a;
}
}
var result = JavaVM.JNI_CreateJavaVM(out IntPtr javaVirtualMachine, out IntPtr environment, &args);
if (result != JNIReturnValue.JNI_OK)
{
throw new Exception("Cannot create JVM " + result.ToString());
}
jvm = new JavaVM(javaVirtualMachine);
env = new JNIEnv(environment);
Directory.SetCurrentDirectory(currentDir);
}
internal int AttachCurrentThread(out JNIEnv penv, JavaVMInitArgs?args)
{
if (_attachCurrentThread == null)
{
//attachCurrentThread = (JNIInvokeInterface_.AttachCurrentThread)Marshal.GetDelegateForFunctionPointer(functions.AttachCurrentThread, typeof(JNIInvokeInterface_.AttachCurrentThread));
GetDelegateForFunctionPointer(_functions.AttachCurrentThread, ref _attachCurrentThread);
}
IntPtr env;
int result;
if (args.HasValue)
{
JavaVMInitArgs initArgs = args.Value;
result = _attachCurrentThread.Invoke(_jvm, out env, &initArgs);
}
else
{
result = _attachCurrentThread.Invoke(_jvm, out env, null);
}
penv = new JNIEnv(env);
return(result);
}
public void LoadVM(Dictionary <string, string> options, bool AddToExistingJVM)
{
// Get the location of the current version of the JVM.dll
string jreVersion = (string)Registry.GetValue(JRE_REGISTRY_KEY, "CurrentVersion", null);
string keyName = Path.Combine(JRE_REGISTRY_KEY, jreVersion);
string jvmDir = (string)Registry.GetValue(keyName, "RuntimeLib", null);
if ((jvmDir.Length == 0) || (!File.Exists(jvmDir)))
{
throw new Exception("Error determining the location of the Java Runtime Environment");
}
// Set the directory to the location of the JVM.dll.
// This will ensure that the API call JNI_CreateJavaVM will work
Directory.SetCurrentDirectory(Path.GetDirectoryName(jvmDir));
var args = new JavaVMInitArgs();
switch (Convert.ToInt32((decimal.Parse(jreVersion.Substring(0, 3)) - 1) / 2 * 10))
{
case 0:
throw new Exception("Unsupported java version. Please upgrade your version of the JRE.");
case 1:
args.version = JNIVersion.JNI_VERSION_1_2;
break;
case 2:
args.version = JNIVersion.JNI_VERSION_1_4;
break;
default:
args.version = JNIVersion.JNI_VERSION_1_6;
break;
}
args.ignoreUnrecognized = JavaVM.BooleanToByte(true); // True
if (options.Count > 0)
{
args.nOptions = options.Count;
var opt = new JavaVMOption[options.Count];
int i = 0;
foreach (KeyValuePair <string, string> kvp in options)
{
opt[i++].optionString = Marshal.StringToHGlobalAnsi(kvp.Key.ToString() + "=" + kvp.Value.ToString());
}
fixed(JavaVMOption *a = &opt[0])
{
// prevents the garbage collector from relocating the opt variable as this is used in unmanaged code that the gc does not know about
args.options = a;
}
}
if (!AttachToCurrentJVMThread)
{
IntPtr environment;
IntPtr javaVirtualMachine;
int result = JavaVM.JNI_CreateJavaVM(out javaVirtualMachine, out environment, &args);
if (result != JNIReturnValue.JNI_OK)
{
throw new Exception("Cannot create JVM " + result.ToString());
}
jvm = new JavaVM(javaVirtualMachine);
env = new JNIEnv(environment);
}
else
{
AttachToCurrentJVM(args);
}
}
