JAVA中的JVM怎么载入函数
本篇内容介绍了"JAVA中的JVM怎么载入函数"的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！
JVM 载入函数
/*
* Load a jvm from "jvmpath" and initialize the invocation functions.
*/
jboolean
LoadJavaVM(const char *jvmpath, InvocationFunctions *ifn)
{
HINSTANCE handle;
JLI_TraceLauncher("JVM path is %s\n", jvmpath);
/*
* The Microsoft C Runtime Library needs to be loaded first. A copy is
* assumed to be present in the "JRE path" directory. If it is not found
* there (or "JRE path" fails to resolve), skip the explicit load and let
* nature take its course, which is likely to be a failure to execute.
*
*/
LoadMSVCRT();
/* Load the Java VM DLL */
if ((handle = LoadLibrary(jvmpath)) == 0) {
JLI_ReportErrorMessage(DLL_ERROR4, (char *)jvmpath);
return JNI_FALSE;
}
/* Now get the function addresses */
ifn->CreateJavaVM =
(void *)GetProcAddress(handle, "JNI_CreateJavaVM");
//初始化默认参数
ifn->GetDefaultJavaVMInitArgs =
(void *)GetProcAddress(handle, "JNI_GetDefaultJavaVMInitArgs");
if (ifn->CreateJavaVM == 0 || ifn->GetDefaultJavaVMInitArgs == 0) {
JLI_ReportErrorMessage(JNI_ERROR1, (char *)jvmpath);
return JNI_FALSE;
}
return JNI_TRUE;
}
//默认参数结构
/*
* This structure is used by the launcher to get the default thread
* stack size from the VM using JNI_GetDefaultJavaVMInitArgs() with a
* version of 1.1. As it is not supported otherwise, it has been removed
* from jni.h
*/
typedef struct JDK1_1InitArgs {
jint version;
char **properties;
jint checkSource;
jint nativeStackSize;
jint javaStackSize;
jint minHeapSize;
jint maxHeapSize;
jint verifyMode;
char *classpath;
jint (JNICALL *vfprintf)(FILE *fp, const char *format, va_list args);
void (JNICALL *exit)(jint code);
void (JNICALL *abort)(void);
jint enableClassGC;
jint enableVerboseGC;
jint disableAsyncGC;
jint verbose;
jboolean debugging;
jint debugPort;
} JDK1_1InitArgs;
//工具函数，用于跟踪jvm
void
JLI_TraceLauncher(const char* fmt, ...)
{
va_list vl;
if (_launcher_debug != JNI_TRUE) return;
va_start(vl, fmt);
vprintf(fmt,vl);
va_end(vl);
fflush(stdout);
}
"JAVA中的JVM怎么载入函数"的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识可以关注网站，小编将为大家输出更多高质量的实用文章！
