如何使用JNI在builder C ++应用程序中启动JVM [英] How to use JNI to start JVM in builder C++ application
问题描述
所以我需要使用jni来调用java方法。
我从这个代码开始:
JNIEnv * env1;
JavaVM ** jvm1;
JavaVMInitArgs vm_args1;
JavaVMOption options1 [1];
options1 [0] .optionString =-Djava.class.path = D:\\Java Src\\\TestStruct; // java源代码的路径
vm_args1.version = JNI_VERSION_1_6; // JDK版本。这表示版本1.6
vm_args1.nOptions = 1;
vm_args1.options = options1;
vm_args1.ignoreUnrecognized = 0;
int reAt = JNI_CreateJavaVM(jvm1,(void **)& env1,& vm_args1);
if(reAt< 0)
Label1-> Caption =failed;
else
Label1-> Caption =Success;
我将jvm.lib转换为OMF lib以便在我的构建器中使用C ++应用程序:
COFF2OMF jvm.lib jvm2.lib
我添加了jvm2.lib到库路径以修复关于JNI_CreateJavaVM函数的链接错误。
现在我的应用程序无错编译。
但是它调用JNI_CreateJavaVM函数时崩溃。
我在我的.exe附近添加了jvm.dll
$ b如何修复它?
Thx
JNI_CreateJavaVM
的第一个参数应为有效的指针 JavaVM *
:
JavaVM * jvm1;
int reAt = JNI_CreateJavaVM(& jvm1,...);
在您的示例中, jvm1
未初始化。
请参阅文档。
So i need to use jni to call java method. i started with this code :
JNIEnv *env1;
JavaVM** jvm1;
JavaVMInitArgs vm_args1;
JavaVMOption options1[1];
options1[0].optionString = "-Djava.class.path=D:\\Java Src\\TestStruct"; //Path to the java source code
vm_args1.version = JNI_VERSION_1_6; //JDK version. This indicates version 1.6
vm_args1.nOptions = 1;
vm_args1.options = options1;
vm_args1.ignoreUnrecognized = 0;
int reAt = JNI_CreateJavaVM(jvm1, (void**)&env1, &vm_args1);
if(reAt < 0)
Label1->Caption = "failed";
else
Label1->Caption = "Success";
I convert jvm.lib to OMF lib for to use in my builder C++ Application :
COFF2OMF jvm.lib jvm2.lib
I added jvm2.lib to the library path to fixe link error about JNI_CreateJavaVM function.
Now my application compile without error.
But it crash when it call JNI_CreateJavaVM function.
I added the jvm.dll near my .exe
What is the pb in there steps??
How can fixe it?
Thx
The first argument to JNI_CreateJavaVM
should be a valid pointer to JavaVM*
:
JavaVM* jvm1;
int reAt = JNI_CreateJavaVM(&jvm1, ...);
In your example, jvm1
is uninitialized.
Consult the documentation for details.
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