The sample code is as follows
# Contains? & ltiostream & gt
# Contains? & ltjni.h & gt
# Contains? & ltwindows.h & gt
# Contains? & ltcstring & gt
# Contains? & ltdirect.h & gt
Use? Namespace? std
# Definition? Dylan? 10000
char*？ GetJrepath(int？ Bit);
int？ CallJAR(int？ BIT，char*buf，char*classPath，char * function name)；
int？ main(int？ argc，？ Charles? *argv[])
{
Charles? *? buff？ =? New? char[DIRLEN]；
getcwd(buff，DIRLEN)；
strcat(buff，" \ \ lib \ \ support . jar ")；
What if? (argc & lt3)
{
Cout < < "wrong input parameter";
Return? 0;
}
int？ Bit? =? 32;
If (! strcmp(argv[2]，" 64 "))
Bit? =? 64? ;
//-30? No jre environment installed? -3 1? Failed to create jvm? -32? Related libraries are missing.
What if? (! strcmp(argv[ 1]，" 0 "))
{
//-20? Configuration file error? -2 1? JSON exception
Return? CallJAR(BIT，buff，" com/run/Author "，" start Author ")；
}
Or what? If (! strcmp(argv[ 1]，" 1 "))
{
Return? CallJAR(BIT，buff，" com/run/UpdateStatus "，" UpdateStatus 1 ")；
}
Or what? If (! strcmp(argv[ 1]，" 2 "))
{
Return? CallJAR(BIT，buff，" com/run/SendMsg_webchinese "，" send SMS ")；
}
other
{
Return? CallJAR(BIT，buff，" com/run/UpdateStatus "，" UpdateANDSMS ")；
}
}
char*？ GetJrepath(int？ Bit)
{
# Definition? MYBUFF？ 123
HKEY？ hKey
Dragon? lRet
char*？ dir？ =? New? char[my buff]；
DWORD？ dwBufLen？ =? MYBUFF
char*？ s？ =? New? char[my buff]；
If (bit? ==? 64)
strcpy(s，" SOFTWARE \ \ wow 6432 node \ \ Java soft \ \ Java？ Runtime? Environment \ \ ";
other
strcpy(s，" SOFTWARE\\JavaSoft\\Java？ Runtime? Environment \ \ ";
lRet？ =? RegOpenKeyEx(HKEY _ LOCAL _ MACHINE，
Text ((TCHAR*)s),
0,
Keyword query value,
& amphKey)；
if(lRet！ = Error _ Success)
Return? NULL
lRet？ =? RegQueryValueEx(hKey，
Text ((TCHAR*) "current version"),
Empty,
Empty,
(LPBYTE)dir，
& ampdwBufLen)；
RegCloseKey(hKey)；
if(lRet！ = Error _ Success)
Return? NULL
strcat(s，dir)；
lRet？ =? RegOpenKeyEx(HKEY _ LOCAL _ MACHINE，
Text ((TCHAR*)s),
0,
Keyword query value,
& amphKey)；
if(lRet！ = Error _ Success)
Return? NULL
dwBufLen？ =? MYBUFF
lRet？ =? RegQueryValueEx(hKey，
Text ((TCHAR *)“runtime lib "),
Empty,
Empty,
(LPBYTE)dir，
& ampdwBufLen)；
RegCloseKey(hKey)；
if(lRet！ = Error _ Success)
Return? NULL
Return? dir
}
int？ CallJAR(int？ BIT，char*buf，char*classPath，char*functionName)
{
typedef？ Quint? (WINAPI？ *PFunCreateJavaVM)(JavaVM？ **,? Invalid? **,? Invalid? *); ?
int？ res？
JavaVMInitArgs？ vm _ args？
JavaVMOption？ Option [3]; ?
JavaVM？ * jvm？
JNIEnv？ * env？
int？ Ryan. =strlen("-Djava.class.path=。 ;" )+strlen(buf)+20；
char*？ Temporary workers? =? New? char[len]；
strcpy(temp，"-Djava.class.path=。 ;" );
strcat(temp，buf)；
/* Set initialization parameters */?
//Disabled? JIT, this is the explanation in JNI document. Isn't the specific meaning clear? It is not clear which values can be taken. ?
//From the sample code given in the JNI document?
Option [0]. optionString？ =? "-DJ ava . compiler = NONE "； ?
//Set the classpath. If the program uses a third-party JAR package, can it also be included in it?
Option [1]. optionString？ =? Temperature; ?
//Set the type of displayed message. These values are gc, class and jni. If more than one message is selected at a time, these values are separated by commas, such as -verbose:gc, class?
//This parameter can be used to observe the process of C++ calling JAVA. After setting this parameter, the program will print the call information on the standard output device?
Option [2]. optionString？ =? "-Detailed: None"; ?
//Set the version number, including JNI _ version _ 1_ 1, JNI _ version _ 1_2, JNI _ version _ 1_4?
//Just select the latest version number of the JRE version you installed, but your JRE version must be equal to or higher than the specified version number?
vm_args.version？ =? JNI _ Version _1_ 4; ?
vm _ args.nOptions？ =? 3; ?
vm_args.options？ =? Options; ?
//This parameter specifies whether nonstandard parameters are ignored. If JNI_FLASE is filled, JNI_CreateJavaVM will return JNI_ERR when it encounters nonstandard parameters.
vm_args.ignoreUnrecognized？ =? JNI _ Really; ?
//Load JVM.DLL dynamic library?
HINSTANCE？ hInstance？ =? * load the library (GetJrepath(BIT))；); ?
What if? (hInstance？ ==? NULL)？
{?
Return? -30; ?
}?
//get the JNI_CreateJavaVM function pointer inside?
PFunCreateJavaVM？ funCreateJavaVM？ =? (PFunCreateJavaVM)::GetProcAddress(h instance，" JNI _ CreateJavaVM ")； ?
//Call JNI_CreateJavaVM to create a virtual machine?
res？ =? (*funCreateJavaVM)。 jvm，？ (void * *)& amp； env，？ & ampVM _ args)； ?
What if? (res？ & lt？ 0)?
{?
Return? -3 1; ?
}?
//Find the test. Demonstrates a class and returns the class object of a JAVA class.
jclass？ cls？ =? env->； FindClass (classpath); ?
//Get an instance of a class according to its class object?
What if? (cls==0)
{
printf("FindClass？ Failed \ n ");
(JVM)-& gt； DestroyJavaVM()； ?
Return? -32;
}
job object？ obj？ =? env->； alloc object(cls)； ?
//Get the methods in the class. The last parameter is the signature of the method, through javap? -s？ -p？ -Classpath? Path? filename
jmethodID？ mid？ =? env->； GetMethodID(cls，functionName，"()I ")； ?
What if? (mid==0)
{
printf("getMethodID？ Failed \ n ");
(JVM)-& gt； DestroyJavaVM()； ?
Return? -32;
}
//Construct parameters and call the method of the object?
jstring？ MSG? =? (jstring)？ env->； CallObjectMethod(obj，mid)； ?
//Destroy the virtual machine and release the dynamic library?
JVM-& gt； DestroyJavaVM()； ?
* free library (Hinstance); ?
Return? (int)msg；
}