Functions
M_bool	M_io_jni_init (JavaVM *Jvm)

M_bool	M_io_jni_android_init (jobject app_context)

JNIEnv *	M_io_jni_getenv (void)

jobject	M_io_jni_get_android_app_context (void)

void	M_io_jni_debug (const char *fmt,...)

jclass	M_io_jni_find_class (JNIEnv env, const char path)

M_hash_dict_t *	M_io_jni_jhashmap_to_mhashdict (JNIEnv *env, jobject map)

jobject	M_io_jni_mhashdict_to_jhashmap (JNIEnv env, M_hash_dict_t dict)

void	M_io_jni_deletelocalref (JNIEnv env, jobject ref)

jobject	M_io_jni_create_globalref (JNIEnv *env, jobject ref)

void	M_io_jni_delete_globalref (JNIEnv env, jobject ref)

size_t	M_io_jni_array_length (JNIEnv *env, jobject arr)

jobject	M_io_jni_array_element (JNIEnv *env, jobject arr, size_t idx)

char *	M_io_jni_jstring_to_pchar (JNIEnv *env, jstring str)

jstring	M_io_jni_pchar_to_jstring (JNIEnv env, const char str)

unsigned char *	M_io_jni_jbyteArray_to_puchar (JNIEnv env, jbyteArray in, size_t max_len, size_t size_out)

jbyteArray	M_io_jni_puchar_to_jbyteArray (JNIEnv env, const unsigned char data, size_t data_size)

void	M_io_jni_jbyteArray_zeroize (JNIEnv *env, jbyteArray arr)

size_t	M_io_jni_jbyteArray_to_buf (JNIEnv env, jbyteArray in, size_t max_len, M_buf_t out)

M_bool	M_io_jni_new_object (jobject rv, char error, size_t error_len, JNIEnv env, const char method, size_t argc,...)

M_bool	M_io_jni_call_jvoid (char error, size_t error_len, JNIEnv env, jobject classobj, const char *method, size_t argc,...)

M_bool	M_io_jni_call_jobject (jobject rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char method, size_t argc,...)

M_bool	M_io_jni_call_jbyte (jbyte rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char method, size_t argc,...)

M_bool	M_io_jni_call_jboolean (jboolean rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char method, size_t argc,...)

M_bool	M_io_jni_call_jchar (jchar rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char method, size_t argc,...)

M_bool	M_io_jni_call_jint (jint rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char method, size_t argc,...)

M_bool	M_io_jni_call_jlong (jlong rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char method, size_t argc,...)

M_bool	M_io_jni_call_jfloat (jfloat rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char method, size_t argc,...)

M_bool	M_io_jni_call_jdouble (jdouble rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char method, size_t argc,...)

M_bool	M_io_jni_call_jobjectArray (jobjectArray rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char method, size_t argc,...)

M_bool	M_io_jni_call_jbyteArray (jbyteArray rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char method, size_t argc,...)

M_bool	M_io_jni_call_jbooleanArray (jbooleanArray rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char method, size_t argc,...)

M_bool	M_io_jni_call_jcharArray (jcharArray rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char method, size_t argc,...)

M_bool	M_io_jni_call_jintArray (jintArray rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char method, size_t argc,...)

M_bool	M_io_jni_call_jlongArray (jlongArray rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char method, size_t argc,...)

M_bool	M_io_jni_call_jfloatArray (jfloatArray rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char method, size_t argc,...)

M_bool	M_io_jni_call_jdoubleArray (jdoubleArray rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char method, size_t argc,...)

M_bool	M_io_jni_call_jobjectField (jobject rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char field)

M_bool	M_io_jni_call_jbyteField (jbyte rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char field)

M_bool	M_io_jni_call_jbooleanField (jboolean rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char field)

M_bool	M_io_jni_call_jcharField (jchar rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char field)

M_bool	M_io_jni_call_jintField (jint rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char field)

M_bool	M_io_jni_call_jlongField (jlong rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char field)

M_bool	M_io_jni_call_jfloatField (jfloat rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char field)

M_bool	M_io_jni_call_jdoubleField (jdouble rv, char error, size_t error_len, JNIEnv env, jobject classobj, const char field)

Detailed Description

Included using the semi-public header of <mstdlib/io/m_io_jni.h> This is not included by default because it is considered a stable API.

Java JNI Helper Functions. Primarily used for Android integration where Bluetooth support requires it. However, nothing here is Android specific and will never be. This is purely JNI and does not use anything outside of what's provided by Java itself.

Function Documentation

◆ M_io_jni_init()

M_bool M_io_jni_init ( JavaVM * Jvm )

Initialization function to initialize the Java JNI environment.

This routine must be called once at startup before any of the M_io_jni helper functions can be used.

This implementation only supports a single Java VM instance, globally.

Parameters

[in] Jvm Initialized JavaVM to use. Must be specified.

Returns: M_TRUE on success, M_FALSE on failure.

◆ M_io_jni_android_init()

M_bool M_io_jni_android_init ( jobject app_context )

Initialization function to initialize the io system for use on Android.

M_io_jni_init must be called before this function. This should only be called when building for Android.

This function must be called in order to use USB-HID devices.

This function must be called before DNS resolution will work on Android 8 (Oreo) or newer when built targeting SDK 26. Also, the ACCESS_NETWORK_STATE permission must be present in the Android application.

Parameters

[in] app_context Android application context. Can be accessed in Java from like so: getApplicationContext().

Returns: M_TRUE on success, M_FALSE on failure.

◆ M_io_jni_getenv()

JNIEnv * M_io_jni_getenv ( void )

Retrieve JNI Environment Handle for current thread.

If thread is not currently assigned a handle, a new one will be created, otherwise the existing handle will be returned.

Returns: JNI Environment Handle or NULL on error

◆ M_io_jni_get_android_app_context()

jobject M_io_jni_get_android_app_context ( void )

Retrieve Android Applilcation Contect.

M_io_jni_android_init must be called to set the context.

Returns: Application Context

◆ M_io_jni_debug()

void M_io_jni_debug	(	const char *	fmt,
			...
	)

Output debug text relevant to JNI execution.

If not using a debug build, this is a no-op, and no information will be output. This is mostly used internally by the implementation, but people wishing to implement additional JNI methods might find this useful for debug purposes.

On Android, this uses the android logging functions, on other systems this simply outputs the message to stderr.

Parameters

[in]	fmt	Standard printf-style format string. A new line will be automatically added to the output.
[in]	...	Arguments as referenced in the format string

◆ M_io_jni_find_class()

jclass M_io_jni_find_class	(	JNIEnv *	env,
		const char *	path
	)

Look up a class based on its path.

Parameters

[in]	env	Optional. Java JNI Environment. If not passed will request it from the JVM. Passing it is an optimization.
[in]	path	The path for the class, such as java/util/HashMap

Returns: global class reference or NULL on failure.

◆ M_io_jni_jhashmap_to_mhashdict()

M_hash_dict_t * M_io_jni_jhashmap_to_mhashdict	(	JNIEnv *	env,
		jobject	map
	)

Convert a Java HashMap into an M_hash_dict_t *.

Parameters

[in]	env	Optional. Java JNI Environment. If not passed will request it from the JVM. Passing it is an optimization.
[in]	map	Java Hash Map object to convert.

Returns: Intialized M_hash_dict_t filled in with the map parameters or NULL on error.

◆ M_io_jni_mhashdict_to_jhashmap()

jobject M_io_jni_mhashdict_to_jhashmap	(	JNIEnv *	env,
		M_hash_dict_t *	dict
	)

Convert an M_hash_dict_t * into a Java HashMap object.

Parameters

[in]	env	Optional. Java JNI Environment. If not passed will request it from the JVM. Passing it is an optimization.
[in]	dict	M_hash_dict_t to convert.

Returns: HashMap Object or NULL on error. The returned object should be released with M_io_jni_deletelocalref() when no longer needed.

◆ M_io_jni_deletelocalref()

void M_io_jni_deletelocalref	(	JNIEnv *	env,
		jobject *	ref
	)

Delete reference to object so garbage collector can destroy it.

This isn't absolutely necessary to call, but is recommended for long-running routines, or if using many objects in a loop so you don't run out of descriptors. When control returns from JNI back to Java, any used JNI objects not manually deleted will be released if they were not returned into java scope. Once an object is deleted it can no longer be used, nor can it be returned to Java.

Parameters

[in]	env	Optional. Java JNI Environment. If not passed will request it from the JVM. Passing it is an optimization.
[in,out]	ref	Object reference to be deleted, passed by reference. Will be set pointer will be set to NULL when dereferenced to ensure it won't be used again.

◆ M_io_jni_create_globalref()

jobject M_io_jni_create_globalref	(	JNIEnv *	env,
		jobject	ref
	)

Create a global JNI reference to prevent garbage collection of a Java object that may need to persist past the point where execution is returned to Java.

If a Java object is held within a C object that needs to persist, and integrator must mark it as a global reference, then delete the global reference when no longer needed, otherwise the object will be cleaned up by Java.

Parameters

[in]	env	Optional. Java JNI Environment. If not passed will request it from the JVM. Passing it is an optimization.
[in]	ref	Java object to create a global reference to.

Returns: Java object with global reference. Must be cleaned up with M_io_jni_create_globalref() or will cause a resource leak.

◆ M_io_jni_delete_globalref()

void M_io_jni_delete_globalref	(	JNIEnv *	env,
		jobject *	ref
	)

Delete the global JNI reference created with M_io_jni_create_globalref()

Parameters

[in]	env	Optional. Java JNI Environment. If not passed will request it from the JVM. Passing it is an optimization.
[in,out]	ref	Object reference to be deleted, passed by reference. Will be set pointer will be set to NULL when dereferenced to ensure it won't be used again.

◆ M_io_jni_array_length()

size_t M_io_jni_array_length	(	JNIEnv *	env,
		jobject	arr
	)

Retrieve length of Array.

Parameters

[in]	env	Optional. Java JNI Environment. If not passed will request it from the JVM. Passing it is an optimization.
[in]	arr	Array object to get count.

Returns: length of array

◆ M_io_jni_array_element()

jobject M_io_jni_array_element	(	JNIEnv *	env,
		jobject	arr,
		size_t	idx
	)

Retrieve an element from an Array.

Parameters

[in]	env	Optional. Java JNI Environment. If not passed will request it from the JVM. Passing it is an optimization.
[in]	arr	Array to retrieve element from.
[in]	idx	Array index.

Returns: Object retrieved from array or NULL on error. The returned object should be released using M_io_jni_deletelocalref() when no longer needed.

◆ M_io_jni_jstring_to_pchar()

char * M_io_jni_jstring_to_pchar	(	JNIEnv *	env,
		jstring	str
	)

Convert jstring into C String (allocated, null terminated).

Parameters

[in]	env	Optional. Java JNI Environment. If not passed will request it from the JVM. Passing it is an optimization.
[in]	str	jstring to convert into C String

Returns: Allocated C String, must be freed with M_free(). NULL on error.

◆ M_io_jni_pchar_to_jstring()

jstring M_io_jni_pchar_to_jstring	(	JNIEnv *	env,
		const char *	str
	)

Convert a C String into a jstring

Parameters

[in]	env	Optional. Java JNI Environment. If not passed will request it from the JVM. Passing it is an optimization.
[in]	str	C String to convert into a jstring.

Returns: jstring object or NULL on error. The returned object should be released using M_io_jni_deletelocalref() when no longer needed.

◆ M_io_jni_jbyteArray_to_puchar()

unsigned char * M_io_jni_jbyteArray_to_puchar	(	JNIEnv *	env,
		jbyteArray	in,
		size_t	max_len,
		size_t *	size_out
	)

Convert a byte array into an unsigned character pointer

Parameters

[in]	env	Optional. Java JNI Environment. If not passed will request it from the JVM. Passing it is an optimization.
[in]	in	Byte array to convert to unsigned character data.
[in]	max_len	Maximum length to use, or 0 for full Byte Array.
[out]	size_out	Size of returned buffer.

Returns: unsigned character buffer, must be freed with M_free(). NULL on error.

◆ M_io_jni_puchar_to_jbyteArray()

jbyteArray M_io_jni_puchar_to_jbyteArray	(	JNIEnv *	env,
		const unsigned char *	data,
		size_t	data_size
	)

Convert an unsigned character buffer into a jbyteArray

Parameters

[in]	env	Optional. Java JNI Environment. If not passed will request it from the JVM. Passing it is an optimization.
[in]	data	Unsigned character data.
[in]	data_size	Size of character data buffer.

Returns: jbyteArray object or NULL on error. The returned object should be released using M_io_jni_deletelocalref() when no longer needed.

◆ M_io_jni_jbyteArray_zeroize()

void M_io_jni_jbyteArray_zeroize	(	JNIEnv *	env,
		jbyteArray	arr
	)

Zeroize a Byte Array. Typically used for memory security reasons.

Parameters

[in]	env	Optional. Java JNI Environment. If not passed will request it from the JVM. Passing it is an optimization.
[in]	arr	Byte Array to zeroize

◆ M_io_jni_jbyteArray_to_buf()

size_t M_io_jni_jbyteArray_to_buf	(	JNIEnv *	env,
		jbyteArray	in,
		size_t	max_len,
		M_buf_t *	out
	)

Copy the contents of a Byte Array to an M_buf_t up to the given size.

Parameters

[in]	env	Optional. Java JNI Environment. If not passed will request it from the JVM. Passing it is an optimization.
[in]	in	Byte Array to copy
[in]	max_len	Maximum length of byte array to copy, or 0 for full array.
[out]	out	Initialized M_buf_t to copy data into

Returns: Number of bytes copied or 0 on error

◆ M_io_jni_new_object()

M_bool M_io_jni_new_object	(	jobject *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		const char *	method,
		size_t	argc,
			...
	)

Create a new object using the specified method.

Parameters

[out]	rv	Returned object, passed by reference. Returned object should be released using M_io_jni_deletelocalref() when no longer needed.
[out]	error	Optional. Buffer to hold error message.
[in]	error_len	Error buffer size.
[in]	env	Optional. Java JNI Environment. If not passed will request it from the JVM. Passing it is an optimization.
[in]	method	The class initializer method. The method specified should be in the form of "path/to/class.<init>", and must have been one of the classes in the global initialization.
[in]	argc	Count of arguments to follow.
[in]	...	Variable argument list depending on method being called.

Returns: M_TRUE if the method was called successfully, M_FALSE if there was a usage error or exception. A value of M_TRUE doesn't mean the returned object was populated, the call may have resulted in an error that didn't raise an exception.

◆ M_io_jni_call_jvoid()

M_bool M_io_jni_call_jvoid	(	char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	method,
		size_t	argc,
			...
	)

Call an object method that returns jvoid (no result).

Parameters

[out]	error	Optional. Buffer to hold error message.
[in]	error_len	Error buffer size.
[in]	env	Optional. Java JNI Environment. If not passed will request it from the JVM. Passing it is an optimization.
[in]	classobj	Class object to call method on. If the method being called is static, this parameter will be ignored, so should be passed as NULL.
[in]	method	The method to be called. The method should be in the form of "path/to/class.method", and must have been one of the methods in the global initialization.
[in]	argc	Count of argument to follow.
[in]	...	Variable argument list depending on method being called.

Returns: M_TRUE if the method was called successfully, M_FALSE if there was a usage error or exception.

◆ M_io_jni_call_jobject()

M_bool M_io_jni_call_jobject	(	jobject *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	method,
		size_t	argc,
			...
	)

Call an object method that returns jobject.

Parameters

[out]	rv	Returned object, passed by reference. Returned object should be released using M_io_jni_deletelocalref() when no longer needed.
[out]	error	Optional. Buffer to hold error message.
[in]	error_len	Error buffer size.
[in]	env	Optional. Java JNI Environment. If not passed will request it from the JVM. Passing it is an optimization.
[in]	classobj	Class object to call method on. If the method being called is static, this parameter will be ignored, so should be passed as NULL.
[in]	method	The method to be called. The method should be in the form of "path/to/class.method", and must have been one of the methods in the global initialization.
[in]	argc	Count of arguments to follow.
[in]	...	Variable argument list depending on method being called.

Returns: M_TRUE if the method was called successfully, M_FALSE if there was a usage error or exception. A value of M_TRUE doesn't mean the returned object was populated, the call may have resulted in an error that didn't raise an exception.

◆ M_io_jni_call_jbyte()

M_bool M_io_jni_call_jbyte	(	jbyte *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	method,
		size_t	argc,
			...
	)

Call an object method that returns a jbyte.

See M_io_jni_call_jobject() for usage information.

◆ M_io_jni_call_jboolean()

M_bool M_io_jni_call_jboolean	(	jboolean *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	method,
		size_t	argc,
			...
	)

Call an object method that returns a jboolean.

See M_io_jni_call_jobject() for usage information.

◆ M_io_jni_call_jchar()

M_bool M_io_jni_call_jchar	(	jchar *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	method,
		size_t	argc,
			...
	)

Call an object method that returns a jchar.

See M_io_jni_call_jobject() for usage information.

◆ M_io_jni_call_jint()

M_bool M_io_jni_call_jint	(	jint *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	method,
		size_t	argc,
			...
	)

Call an object method that returns a jint.

See M_io_jni_call_jobject() for usage information.

◆ M_io_jni_call_jlong()

M_bool M_io_jni_call_jlong	(	jlong *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	method,
		size_t	argc,
			...
	)

Call an object method that returns a jlong.

See M_io_jni_call_jobject() for usage information.

◆ M_io_jni_call_jfloat()

M_bool M_io_jni_call_jfloat	(	jfloat *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	method,
		size_t	argc,
			...
	)

Call an object method that returns a jfloat.

See M_io_jni_call_jobject() for usage information.

◆ M_io_jni_call_jdouble()

M_bool M_io_jni_call_jdouble	(	jdouble *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	method,
		size_t	argc,
			...
	)

Call an object method that returns a jdouble.

See M_io_jni_call_jobject() for usage information.

◆ M_io_jni_call_jobjectArray()

M_bool M_io_jni_call_jobjectArray	(	jobjectArray *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	method,
		size_t	argc,
			...
	)

Call an object method that returns a jobjectArray.

See M_io_jni_call_jobject() for usage information.

◆ M_io_jni_call_jbyteArray()

M_bool M_io_jni_call_jbyteArray	(	jbyteArray *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	method,
		size_t	argc,
			...
	)

Call an object method that returns a jbyteArray.

See M_io_jni_call_jobject() for usage information.

◆ M_io_jni_call_jbooleanArray()

M_bool M_io_jni_call_jbooleanArray	(	jbooleanArray *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	method,
		size_t	argc,
			...
	)

Call an object method that returns a jbooleanArray.

See M_io_jni_call_jobject() for usage information.

◆ M_io_jni_call_jcharArray()

M_bool M_io_jni_call_jcharArray	(	jcharArray *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	method,
		size_t	argc,
			...
	)

Call an object method that returns a jcharArray.

See M_io_jni_call_jobject() for usage information.

◆ M_io_jni_call_jintArray()

M_bool M_io_jni_call_jintArray	(	jintArray *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	method,
		size_t	argc,
			...
	)

Call an object method that returns a jintArray.

See M_io_jni_call_jobject() for usage information.

◆ M_io_jni_call_jlongArray()

M_bool M_io_jni_call_jlongArray	(	jlongArray *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	method,
		size_t	argc,
			...
	)

Call an object method that returns a jlongArray.

See M_io_jni_call_jobject() for usage information.

◆ M_io_jni_call_jfloatArray()

M_bool M_io_jni_call_jfloatArray	(	jfloatArray *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	method,
		size_t	argc,
			...
	)

Call an object method that returns a jfloatArray.

See M_io_jni_call_jobject() for usage information.

◆ M_io_jni_call_jdoubleArray()

M_bool M_io_jni_call_jdoubleArray	(	jdoubleArray *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	method,
		size_t	argc,
			...
	)

Call an object method that returns a jdoubleArray.

See M_io_jni_call_jobject() for usage information.

◆ M_io_jni_call_jobjectField()

M_bool M_io_jni_call_jobjectField	(	jobject *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	field
	)

Call an object field that returns a jobject.

Parameters

[out]	rv	Returned value, passed by reference. Returned object should be released using M_io_jni_deletelocalref() when no longer needed.
[out]	error	Optional. Buffer to hold error message.
[in]	error_len	Error buffer size.
[in]	env	Optional. Java JNI Environment. If not passed will request it from the JVM. Passing it is an optimization.
[in]	classobj	Class object to call method on. If the method being called is static, this parameter will be ignored, so should be passed as NULL.
[in]	field	The field to be called. The field should be in the form of "path/to/class.field", and must have been one of the fields in the global initialization.

Returns: M_TRUE if the method was called successfully, M_FALSE if there was a usage error or exception. A value of M_TRUE doesn't mean the returned object was populated, the call may have resulted in an error that didn't raise an exception.

◆ M_io_jni_call_jbyteField()

M_bool M_io_jni_call_jbyteField	(	jbyte *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	field
	)

Call an object field that returns a jbyte.

See M_io_jni_call_jobjectField() for usage information.

◆ M_io_jni_call_jbooleanField()

M_bool M_io_jni_call_jbooleanField	(	jboolean *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	field
	)

Call an object field that returns a jboolean.

See M_io_jni_call_jobjectField() for usage information.

◆ M_io_jni_call_jcharField()

M_bool M_io_jni_call_jcharField	(	jchar *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	field
	)

Call an object field that returns a jchar.

See M_io_jni_call_jobjectField() for usage information.

◆ M_io_jni_call_jintField()

M_bool M_io_jni_call_jintField	(	jint *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	field
	)

Call an object field that returns a jint.

See M_io_jni_call_jobjectField() for usage information.

◆ M_io_jni_call_jlongField()

M_bool M_io_jni_call_jlongField	(	jlong *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	field
	)

Call an object field that returns a jlong.

See M_io_jni_call_jobjectField() for usage information.

◆ M_io_jni_call_jfloatField()

M_bool M_io_jni_call_jfloatField	(	jfloat *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	field
	)

Call an object field that returns a jfloat.

See M_io_jni_call_jobjectField() for usage information.

◆ M_io_jni_call_jdoubleField()

M_bool M_io_jni_call_jdoubleField	(	jdouble *	rv,
		char *	error,
		size_t	error_len,
		JNIEnv *	env,
		jobject	classobj,
		const char *	field
	)

Call an object field that returns a jdouble.

See M_io_jni_call_jobjectField() for usage information.