1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
#include "NewtCommon.h"
#include <string.h>
static const char * const ClazzNameRuntimeException = "java/lang/RuntimeException";
static jclass runtimeExceptionClz=NULL;
void NewtCommon_FatalError(JNIEnv *env, const char* msg, ...)
{
char buffer[512];
va_list ap;
va_start(ap, msg);
vsnprintf(buffer, sizeof(buffer), msg, ap);
va_end(ap);
fprintf(stderr, "%s\n", buffer);
(*env)->FatalError(env, buffer);
}
void NewtCommon_throwNewRuntimeException(JNIEnv *env, const char* msg, ...)
{
char buffer[512];
va_list ap;
va_start(ap, msg);
vsnprintf(buffer, sizeof(buffer), msg, ap);
va_end(ap);
(*env)->ThrowNew(env, runtimeExceptionClz, buffer);
}
void NewtCommon_init(JNIEnv *env) {
if(NULL==runtimeExceptionClz) {
jclass c = (*env)->FindClass(env, ClazzNameRuntimeException);
if(NULL==c) {
NewtCommon_FatalError(env, "NEWT: can't find %s", ClazzNameRuntimeException);
}
runtimeExceptionClz = (jclass)(*env)->NewGlobalRef(env, c);
(*env)->DeleteLocalRef(env, c);
if(NULL==runtimeExceptionClz) {
NewtCommon_FatalError(env, "NEWT: can't use %s", ClazzNameRuntimeException);
}
}
}
const char * NewtCommon_GetStaticStringMethod(JNIEnv *jniEnv, jclass clazz, jmethodID jGetStrID, char *dest, int destSize, const char *altText) {
if(NULL != jniEnv && NULL != clazz && NULL != jGetStrID) {
jstring jstr = (jstring) (*jniEnv)->CallStaticObjectMethod(jniEnv, clazz, jGetStrID);
if(NULL != jstr) {
const char * str = (*jniEnv)->GetStringUTFChars(jniEnv, jstr, NULL);
if( NULL != str) {
strncpy(dest, str, destSize-1);
dest[destSize-1] = 0; // EOS
(*jniEnv)->ReleaseStringUTFChars(jniEnv, jstr, str);
return dest;
}
}
}
strncpy(dest, altText, destSize-1);
dest[destSize-1] = 0; // EOS
return dest;
}
jchar* NewtCommon_GetNullTerminatedStringChars(JNIEnv* env, jstring str)
{
jchar* strChars = NULL;
strChars = calloc((*env)->GetStringLength(env, str) + 1, sizeof(jchar));
if (strChars != NULL) {
(*env)->GetStringRegion(env, str, 0, (*env)->GetStringLength(env, str), strChars);
}
return strChars;
}
JNIEnv* NewtCommon_GetJNIEnv(JavaVM * jvmHandle, int jvmVersion, int asDaemon, int * shallBeDetached) {
JNIEnv* curEnv = NULL;
JNIEnv* newEnv = NULL;
int envRes;
// retrieve this thread's JNIEnv curEnv - or detect it's detached
envRes = (*jvmHandle)->GetEnv(jvmHandle, (void **) &curEnv, jvmVersion) ;
if( JNI_EDETACHED == envRes ) {
// detached thread - attach to JVM
if( asDaemon ) {
envRes = (*jvmHandle)->AttachCurrentThreadAsDaemon(jvmHandle, (void**) &newEnv, NULL);
} else {
envRes = (*jvmHandle)->AttachCurrentThread(jvmHandle, (void**) &newEnv, NULL);
}
if( JNI_OK != envRes ) {
fprintf(stderr, "JNIEnv: can't attach thread: %d\n", envRes);
return NULL;
}
curEnv = newEnv;
} else if( JNI_OK != envRes ) {
// oops ..
fprintf(stderr, "can't GetEnv: %d\n", envRes);
return NULL;
}
if (curEnv==NULL) {
fprintf(stderr, "env is NULL\n");
return NULL;
}
*shallBeDetached = NULL != newEnv;
return curEnv;
}
|
