[Solved] Independant Threads with separate CommandLine
-
Hello,
I have a main Qt-Thread (main.exe), which in turn starts an executable jar via JNI (lets say external.jar).
This external.jar listens continuously on a special socket(localhost, PORT).
The expected message should be sent by the main.exe, which is blocked by the Listening external.jar.I would like to run that jar in a separate thread, and if possible with a separate cmd.exe.
@
#include <jni.h>
#include "ExternJar.h"#pragma comment (lib,"C:\Program Files\Java\jdk1.6.0_26\lib\jvm.lib")
/// Constructor
ExternJar::ExternJar(const char* pPathToJar, const char* pPathToLib, const char t_argv, const char t_path2Package, const char t_methodName)
{
int oi = 0;
options[oi++].optionString = const_cast<char>(pPathToJar);
vm_args.nOptions = oi;
vm_args.version = JNI_VERSION_1_6;
vm_args.options = options;
vm_args.ignoreUnrecognized = JNI_FALSE;argumentString = t_argv;
path2Jar = pPathToJar;
path2Lib = pPathToLib;
packagePath = t_path2Package;
methodName = t_methodName;
debugMode = 0;
}void ExternJar::setClassName()
{
switch(JNI_CreateJavaVM( &jvm,(void **)&env, &vm_args)) {
case JNI_OK:
printf("\nJVM created --> Ready ...\n");
}
if( NULL == (cls = env->FindClass(packagePath)) ) printf("\nCan't find class %s\n", packagePath);
else printf("\nClass %s found!\n", packagePath);
}void ExternJar::setArgCV()
{
if (!argumentString) return;
this->applicationArg0 = env->NewStringUTF(argumentString);
this->applicationArgs = env->NewObjectArray(1, env->FindClass("java/lang/String"), applicationArg0);
env->SetObjectArrayElement(applicationArgs, 0, applicationArg0);
}void ExternJar::setMethodName()
{
mid = env->GetStaticMethodID(cls, methodName, "([Ljava/lang/String;)V");
printf("\nMethod name set to: %s", methodName);
}void ExternJar::callXMethod()
{
printf("\nCall now \n%s("%s"):", methodName, argumentString);
if (mid != NULL) env->CallStaticVoidMethod(cls, mid, applicationArgs);
else printf("\nMethod %s corrupted!\n", mid);
}JavaVM * ExternJar::getVM()
{
return this->jvm;
}void * ExternJar::getEnv()
{
return this->env;
}bool ExternJar::destroyVM()
{
printf("\nDestroy VM now!");
if ( this->getVM()->DestroyJavaVM() == 1 ) return true;
else return false;
}void ExternJar::run()
{
this->setClassName();
this->setArgCV();
this->setMethodName();
this->callXMethod();
exec();
}@I have Q_OBJECT set in the Header, it derives from QThread. I have a run() Method which also has a exec()... What else?
Thank you for any hints.Cheers Huck
-
I wonder If can run that in a separate shell?
@
QString program = "C:\Program Files\Java\jdk1.7.0\bin\java.exe";
QStringList arguments;
arguments << "-jar" << "C:\Project\dist\Project.jar" << "-m" << "module.db" << "-i" << "K;1076076896,1076076882" ;
QProcess *myProcess = new QProcess();
myProcess->start(program, arguments);
@What can I search for, when I want to use the wrapper possibility?
-
First:
Don't use backslashes for the program path, use forward slashes. Qt will do the translation transparently.Second:
Why do you want to involve a shell? It will do nothing else than calling java.exe with your arguments! Does the code you presented not work? -
The code in my first post works, I can invoke my extarnal.jar from my Qt-Project.
But my external.jar continuously listens on the socket to a port, while the expected message is never being sent by my suspended Qt-Project.
Therefore I try to make run the external.jar indipendent.
-
Here I call another *.jar, Its a Server, which listens uninterrupted to a socket and prints status messages System.out.println("Bla") continously as well. This jar has an infinte while-loop and does not terminate..
SO when I start this, another cmd.exe opens and that output should be visible?@
void MyClass::runExternal()
{
QString t_exe_name("java.exe");
QStringList t_exe_arguments;
t_exe_arguments << "-jar" << "C:/SD_Projectz/TestServer/dist/TestServer.jar";QProcess *myProcess = new QProcess(p_ToObject);
QString t_joined = t_exe_arguments.join(" ");
QString t_all = QString("%1 %2").arg(t_exe_name).arg(t_joined);
myProcess->start(t_all);printf("\nWAIT: %d", myProcess->pid());
}
@Each start() my pid() is changed, visible on my Parent command line window, but no other cmd.exe opens for this Process.
When p_ToObject (the parent) is deleted, my process is terminated as well, right?
-
These *.jars have System.out.println("kljdas"); so without any further cmd.exe nothing is visible?
Then the only way I recognize the running jar is the java.exe in the TaskManager?
And since the jar is running continuously, I would say my java.exe should not disappear?
-
Your java.exe does not "disappear". It has no user interface, so it runs in the background, where it belongs.
If you want to see the output of stdout or stderr, you should write a .bat file. Either this opens a cmd.exe automatically when run, or you have to give it as argument to cmd.exe.
-
[quote author="huckfinn" date="1317727677"]
But my external.jar continuously listens on the socket to a port, while the expected message is never being sent by my suspended Qt-Project.[/quote]If I get it right, you need to start the process in background, since it is a daemon, then startdetached should work for you. If you need to check only the output, you can redirect stdout to a log file (or embed a logging facility in your java application).