Retrieve port details/description when calling getCommPort(String)

src/main/c/Posix/SerialPort_Posix.c

@@ -79,6 +79,7 @@ jfieldID writeTimeoutField;
 jfieldID eventFlagsField;
 
 // List of available serial ports
+char portsEnumerated = 0;
 serialPortVector serialPorts = { NULL, 0, 0 };
 
 // JNI exception handler
@@ -98,6 +99,37 @@ static inline jboolean checkJniError(JNIEnv *env, int lineNumber)
 	return JNI_FALSE;
 }
 
+// Generalized port enumeration function
+static void enumeratePorts(void)
+{
+	// Reset the enumerated flag on all non-open serial ports
+	for (int i = 0; i < serialPorts.length; ++i)
+		serialPorts.ports[i]->enumerated = (serialPorts.ports[i]->handle > 0);
+
+	// Enumerate serial ports on this machine
+#if defined(__linux__)
+
+	recursiveSearchForComPorts(&serialPorts, "/sys/devices/");
+	driverBasedSearchForComPorts(&serialPorts, "/proc/tty/driver/serial", "/dev/ttyS");
+	driverBasedSearchForComPorts(&serialPorts, "/proc/tty/driver/mvebu_serial", "/dev/ttyMV");
+	lastDitchSearchForComPorts(&serialPorts);
+
+#elif defined(__sun__) || defined(__APPLE__) || defined(__FreeBSD__) || defined(__OpenBSD__)
+
+	searchForComPorts(&serialPorts);
+
+#endif
+
+	// Remove all non-enumerated ports from the serial port listing
+	for (int i = 0; i < serialPorts.length; ++i)
+		if (!serialPorts.ports[i]->enumerated)
+		{
+			removePort(&serialPorts, serialPorts.ports[i]);
+			i--;
+		}
+	portsEnumerated = 1;
+}
+
 #if defined(__linux__) && !defined(__ANDROID__)
 
 // Event listening threads
@@ -207,31 +239,8 @@ void* eventReadingThread2(void *serialPortPointer)
 
 JNIEXPORT jobjectArray JNICALL Java_com_fazecast_jSerialComm_SerialPort_getCommPorts(JNIEnv *env, jclass serialComm)
 {
-	// Reset the enumerated flag on all non-open serial ports
+	// Enumerate all ports on the current system
-	for (int i = 0; i < serialPorts.length; ++i)
+	enumeratePorts();
-		serialPorts.ports[i]->enumerated = (serialPorts.ports[i]->handle > 0);
-
-	// Enumerate serial ports on this machine
-#if defined(__linux__)
-
-	recursiveSearchForComPorts(&serialPorts, "/sys/devices/");
-	driverBasedSearchForComPorts(&serialPorts, "/proc/tty/driver/serial", "/dev/ttyS");
-	driverBasedSearchForComPorts(&serialPorts, "/proc/tty/driver/mvebu_serial", "/dev/ttyMV");
-	lastDitchSearchForComPorts(&serialPorts);
-
-#elif defined(__sun__) || defined(__APPLE__) || defined(__FreeBSD__) || defined(__OpenBSD__)
-
-	searchForComPorts(&serialPorts);
-
-#endif
-
-	// Remove all non-enumerated ports from the serial port listing
-	for (int i = 0; i < serialPorts.length; ++i)
-		if (!serialPorts.ports[i]->enumerated)
-		{
-			removePort(&serialPorts, serialPorts.ports[i]);
-			i--;
-		}
 
 	// Create a Java-based port listing
 	jobjectArray arrayObject = (*env)->NewObjectArray(env, serialPorts.length, serialCommClass, 0);
@@ -356,6 +365,38 @@ JNIEXPORT void JNICALL Java_com_fazecast_jSerialComm_SerialPort_uninitializeLibr
 	checkJniError(env, __LINE__ - 1);
 }
 
+JNIEXPORT void JNICALL Java_com_fazecast_jSerialComm_SerialPort_retrievePortDetails(JNIEnv *env, jobject obj)
+{
+	// Retrieve the serial port parameter fields
+	jstring portNameJString = (jstring)(*env)->GetObjectField(env, obj, comPortField);
+	if (checkJniError(env, __LINE__ - 1)) return;
+	const char *portName = (*env)->GetStringUTFChars(env, portNameJString, NULL);
+	if (checkJniError(env, __LINE__ - 1)) return;
+
+	// Ensure that the serial port exists
+	if (!portsEnumerated)
+		enumeratePorts();
+	serialPort *port = fetchPort(&serialPorts, portName);
+	if (!port)
+	{
+		(*env)->ReleaseStringUTFChars(env, portNameJString, portName);
+		checkJniError(env, __LINE__ - 1);
+		return;
+	}
+
+	// Fill in the Java-side port details
+	(*env)->SetObjectField(env, obj, portDescriptionField, (*env)->NewStringUTF(env, port->portDescription));
+	if (checkJniError(env, __LINE__ - 1)) return;
+	(*env)->SetObjectField(env, obj, friendlyNameField, (*env)->NewStringUTF(env, port->friendlyName));
+	if (checkJniError(env, __LINE__ - 1)) return;
+	(*env)->SetObjectField(env, obj, portLocationField, (*env)->NewStringUTF(env, port->portLocation));
+	if (checkJniError(env, __LINE__ - 1)) return;
+
+	// Release all JNI structures
+	(*env)->ReleaseStringUTFChars(env, portNameJString, portName);
+	checkJniError(env, __LINE__ - 1);
+}
+
 JNIEXPORT jlong JNICALL Java_com_fazecast_jSerialComm_SerialPort_openPortNative(JNIEnv *env, jobject obj)
 {
 	// Retrieve the serial port parameter fields

src/main/c/Posix/com_fazecast_jSerialComm_SerialPort.h

@@ -99,6 +99,14 @@ JNIEXPORT void JNICALL Java_com_fazecast_jSerialComm_SerialPort_initializeLibrar
 JNIEXPORT void JNICALL Java_com_fazecast_jSerialComm_SerialPort_uninitializeLibrary
   (JNIEnv *, jclass);
 
+/*
+ * Class:     com_fazecast_jSerialComm_SerialPort
+ * Method:    retrievePortDetails
+ * Signature: ()V
+ */
+JNIEXPORT void JNICALL Java_com_fazecast_jSerialComm_SerialPort_retrievePortDetails
+  (JNIEnv *, jobject);
+
 /*
  * Class:     com_fazecast_jSerialComm_SerialPort
  * Method:    openPortNative

src/main/c/Windows/SerialPort_Windows.c

@@ -2,7 +2,7 @@
  * SerialPort_Windows.c
  *
  *       Created on:  Feb 25, 2012
- *  Last Updated on:  Jan 21, 2022
+ *  Last Updated on:  Jan 25, 2022
  *           Author:  Will Hedgecock
  *
  * Copyright (C) 2012-2022 Fazecast, Inc.
@@ -78,6 +78,7 @@ typedef int (__stdcall *FT_CreateDeviceInfoListFunction)(LPDWORD);
 typedef int (__stdcall *FT_GetDeviceInfoListFunction)(FT_DEVICE_LIST_INFO_NODE*, LPDWORD);
 
 // List of available serial ports
+char portsEnumerated = 0;
 serialPortVector serialPorts = { NULL, 0, 0 };
 
 // JNI exception handler
@@ -97,7 +98,8 @@ static inline jboolean checkJniError(JNIEnv *env, int lineNumber)
 	return JNI_FALSE;
 }
 
-JNIEXPORT jobjectArray JNICALL Java_com_fazecast_jSerialComm_SerialPort_getCommPorts(JNIEnv *env, jclass serialComm)
+// Generalized port enumeration function
+static void enumeratePorts(void)
 {
 	// Reset the enumerated flag on all non-open serial ports
 	for (int i = 0; i < serialPorts.length; ++i)
@@ -312,8 +314,16 @@ JNIEXPORT jobjectArray JNICALL Java_com_fazecast_jSerialComm_SerialPort_getCommP
 			removePort(&serialPorts, serialPorts.ports[i]);
 			i--;
 		}
+	portsEnumerated = 1;
+}
+
+JNIEXPORT jobjectArray JNICALL Java_com_fazecast_jSerialComm_SerialPort_getCommPorts(JNIEnv *env, jclass serialComm)
+{
+	// Enumerate all ports on the current system
+	enumeratePorts();
 
 	// Get relevant SerialComm methods and fill in com port array
+	wchar_t comPort[128];
 	jobjectArray arrayObject = (*env)->NewObjectArray(env, serialPorts.length, serialCommClass, 0);
 	if (checkJniError(env, __LINE__ - 1)) return arrayObject;
 	for (int i = 0; i < serialPorts.length; ++i)
@@ -415,6 +425,38 @@ JNIEXPORT void JNICALL Java_com_fazecast_jSerialComm_SerialPort_uninitializeLibr
 	checkJniError(env, __LINE__ - 1);
 }
 
+JNIEXPORT void JNICALL Java_com_fazecast_jSerialComm_SerialPort_retrievePortDetails(JNIEnv *env, jobject obj)
+{
+	// Retrieve the serial port parameter fields
+	jstring portNameJString = (jstring)(*env)->GetObjectField(env, obj, comPortField);
+	if (checkJniError(env, __LINE__ - 1)) return;
+	const wchar_t *portName = (wchar_t*)(*env)->GetStringChars(env, portNameJString, NULL);
+	if (checkJniError(env, __LINE__ - 1)) return;
+
+	// Ensure that the serial port exists
+	if (!portsEnumerated)
+		enumeratePorts();
+	serialPort *port = fetchPort(&serialPorts, portName);
+	if (!port)
+	{
+		(*env)->ReleaseStringChars(env, portNameJString, (const jchar*)portName);
+		checkJniError(env, __LINE__ - 1);
+		return;
+	}
+
+	// Fill in the Java-side port details
+	(*env)->SetObjectField(env, obj, friendlyNameField, (*env)->NewString(env, (jchar*)port->friendlyName, wcslen(port->friendlyName)));
+	if (checkJniError(env, __LINE__ - 1)) return;
+	(*env)->SetObjectField(env, obj, portDescriptionField, (*env)->NewString(env, (jchar*)port->portDescription, wcslen(port->portDescription)));
+	if (checkJniError(env, __LINE__ - 1)) return;
+	(*env)->SetObjectField(env, obj, portLocationField, (*env)->NewString(env, (jchar*)port->portLocation, wcslen(port->portLocation)));
+	if (checkJniError(env, __LINE__ - 1)) return;
+
+	// Release all JNI structures
+	(*env)->ReleaseStringChars(env, portNameJString, (const jchar*)portName);
+	checkJniError(env, __LINE__ - 1);
+}
+
 JNIEXPORT jlong JNICALL Java_com_fazecast_jSerialComm_SerialPort_openPortNative(JNIEnv *env, jobject obj)
 {
 	// Retrieve the serial port parameter fields

src/main/c/Windows/WindowsHelperFunctions.c

@@ -2,7 +2,7 @@
  * WindowsHelperFunctions.c
  *
  *       Created on:  May 05, 2015
- *  Last Updated on:  Jan 22, 2022
+ *  Last Updated on:  Jan 25, 2022
  *           Author:  Will Hedgecock
  *
  * Copyright (C) 2012-2022 Fazecast, Inc.
@@ -77,6 +77,11 @@ serialPort* pushBack(serialPortVector* vector, const wchar_t* key, const wchar_t
 
 serialPort* fetchPort(serialPortVector* vector, const wchar_t* key)
 {
+	// Move past any opening slashes
+	if ((key[0] == L'\\') && (key[1] == L'\\') && (key[2] == L'.') && (key[3] == L'\\'))
+		key += 4;
+
+	// Retrieve the serial port specified by the passed-in key
 	for (int i = 0; i < vector->length; ++i)
 		if (wcscmp(key, vector->ports[i]->portPath) == 0)
 			return vector->ports[i];

src/main/java/com/fazecast/jSerialComm/SerialPort.java

@@ -2,7 +2,7 @@
  * SerialPort.java
  *
  *       Created on:  Feb 25, 2012
- *  Last Updated on:  Jan 20, 2022
+ *  Last Updated on:  Jan 25, 2022
  *           Author:  Will Hedgecock
  *
  * Copyright (C) 2012-2022 Fazecast, Inc.
@@ -460,7 +460,7 @@ public final class SerialPort
 	 * @return A {@link SerialPort} object.
 	 * @throws SerialPortInvalidPortException If a {@link SerialPort} object cannot be created due to a logical or formatting error in the portDescriptor parameter.
 	 */
-	static public final SerialPort getCommPort(String portDescriptor) throws SerialPortInvalidPortException
+	static public final synchronized SerialPort getCommPort(String portDescriptor) throws SerialPortInvalidPortException
 	{
 		// Correct port descriptor, if needed
 		try
@@ -493,6 +493,8 @@ public final class SerialPort
 		serialPort.comPort = portDescriptor;
 		serialPort.friendlyName = "User-Specified Port";
 		serialPort.portDescription = "User-Specified Port";
+		serialPort.portLocation = "0-0";
+		serialPort.retrievePortDetails();
 		return serialPort;
 	}
 
@@ -552,7 +554,7 @@ public final class SerialPort
 	private volatile String comPort, friendlyName, portDescription, portLocation;
 	private volatile boolean eventListenerRunning = false, disableConfig = false, disableExclusiveLock = false;
 	private volatile boolean rs485Mode = false, rs485ActiveHigh = true, rs485RxDuringTx = false, rs485EnableTermination = false;
-	private volatile boolean isRtsEnabled = true, isDtrEnabled = true, autoFlushIOBuffers = false;
+	private volatile boolean isRtsEnabled = true, isDtrEnabled = true, autoFlushIOBuffers = false, requestElevatedPermissions = false;
 	private SerialPortInputStream inputStream = null;
 	private SerialPortOutputStream outputStream = null;
 
@@ -709,7 +711,7 @@ public final class SerialPort
 	 * exclusive locks on system resources.
 	 */
 	public final synchronized void disableExclusiveLock() { disableExclusiveLock = true; }
-	
+
 	/**
 	 * Returns the source code line location of the latest error encountered during execution of
 	 * the native code for this port.
@@ -734,6 +736,7 @@ public final class SerialPort
 	// Serial Port Setup Methods
 	private static native void initializeLibrary();						// Initializes the JNI code
 	private static native void uninitializeLibrary();					// Un-initializes the JNI code
+	private final native void retrievePortDetails();					// Retrieves port descriptions, names, and details
 	private final native long openPortNative();							// Opens serial port
 	private final native long closePortNative(long portHandle);			// Closes serial port
 	private final native boolean configPort(long portHandle);			// Changes/sets serial port parameters as defined by this class