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150 lines (121 loc) · 3.74 KB
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/**
@version 1.20 2007-10-26
@author Cay Horstmann
*/
#include <jni.h>
#include <stdlib.h>
#ifdef _WINDOWS
#include <windows.h>
static HINSTANCE loadJVMLibrary(void);
typedef jint (JNICALL *CreateJavaVM_t)(JavaVM **, void **, JavaVMInitArgs *);
#endif
int main()
{
JavaVMOption options[2];
JavaVMInitArgs vm_args;
JavaVM *jvm;
JNIEnv *env;
long status;
jclass class_Welcome;
jclass class_String;
jobjectArray args;
jmethodID id_main;
#ifdef _WINDOWS
HINSTANCE hjvmlib;
CreateJavaVM_t createJavaVM;
#endif
options[0].optionString = "-Djava.class.path=.";
memset(&vm_args, 0, sizeof(vm_args));
vm_args.version = JNI_VERSION_1_2;
vm_args.nOptions = 1;
vm_args.options = options;
#ifdef _WINDOWS
hjvmlib = loadJVMLibrary();
createJavaVM = (CreateJavaVM_t) GetProcAddress(hjvmlib, "JNI_CreateJavaVM");
status = (*createJavaVM)(&jvm, (void **) &env, &vm_args);
#else
status = JNI_CreateJavaVM(&jvm, (void **) &env, &vm_args);
#endif
if (status == JNI_ERR)
{
fprintf(stderr, "Error creating VM\n");
return 1;
}
class_Welcome = (*env)->FindClass(env, "Welcome");
id_main = (*env)->GetStaticMethodID(env, class_Welcome, "main", "([Ljava/lang/String;)V");
class_String = (*env)->FindClass(env, "java/lang/String");
args = (*env)->NewObjectArray(env, 0, class_String, NULL);
(*env)->CallStaticVoidMethod(env, class_Welcome, id_main, args);
(*jvm)->DestroyJavaVM(jvm);
return 0;
}
#ifdef _WINDOWS
static int GetStringFromRegistry(HKEY key, const char *name, char *buf, jint bufsize)
{
DWORD type, size;
return RegQueryValueEx(key, name, 0, &type, 0, &size) == 0
&& type == REG_SZ
&& size < (unsigned int) bufsize
&& RegQueryValueEx(key, name, 0, 0, buf, &size) == 0;
}
static void GetPublicJREHome(char *buf, jint bufsize)
{
HKEY key, subkey;
char version[MAX_PATH];
/* Find the current version of the JRE */
char *JRE_KEY = "Software\\JavaSoft\\Java Runtime Environment";
if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, JRE_KEY, 0, KEY_READ, &key) != 0)
{
fprintf(stderr, "Error opening registry key '%s'\n", JRE_KEY);
exit(1);
}
if (!GetStringFromRegistry(key, "CurrentVersion", version, sizeof(version)))
{
fprintf(stderr, "Failed reading value of registry key:\n\t%s\\CurrentVersion\n", JRE_KEY);
RegCloseKey(key);
exit(1);
}
/* Find directory where the current version is installed. */
if (RegOpenKeyEx(key, version, 0, KEY_READ, &subkey) != 0)
{
fprintf(stderr, "Error opening registry key '%s\\%s'\n", JRE_KEY, version);
RegCloseKey(key);
exit(1);
}
if (!GetStringFromRegistry(subkey, "JavaHome", buf, bufsize))
{
fprintf(stderr, "Failed reading value of registry key:\n\t%s\\%s\\JavaHome\n",
JRE_KEY, version);
RegCloseKey(key);
RegCloseKey(subkey);
exit(1);
}
RegCloseKey(key);
RegCloseKey(subkey);
}
static HINSTANCE loadJVMLibrary(void)
{
HINSTANCE h1, h2;
char msvcdll[MAX_PATH];
char javadll[MAX_PATH];
GetPublicJREHome(msvcdll, MAX_PATH);
strcpy(javadll, msvcdll);
strncat(msvcdll, "\\bin\\msvcr71.dll", MAX_PATH - strlen(msvcdll));
msvcdll[MAX_PATH - 1] = '\0';
strncat(javadll, "\\bin\\client\\jvm.dll", MAX_PATH - strlen(javadll));
javadll[MAX_PATH - 1] = '\0';
h1 = LoadLibrary(msvcdll);
if (h1 == NULL)
{
fprintf(stderr, "Can't load library msvcr71.dll\n");
exit(1);
}
h2 = LoadLibrary(javadll);
if (h2 == NULL)
{
fprintf(stderr, "Can't load library jvm.dll\n");
exit(1);
}
return h2;
}
#endif