protobuf转换的数组传进scoket中类型转换错误

Posted 2023-04-24

只有转换才能转成 byte[]数组类型的[8, 100, 16, -17, -65, -67, 3, 26, 5, 55, 56, 57, 55, 57]为什么我转换的话就变成了这样的数组[91, 56, 44, 32, 49, 48, 48, 44, 32, 49, 54, 44, 32, 45, 49, 55, 44, 32, 45, 54, 53, 44, 32, 45, 54, 55, 44, 32, 51, 44, 32, 50, 54, 44, 32, 53, 44, 32, 53, 53, 44, 32, 53, 54, 44, 32, 53, 55, 44, 32, 53, 53, 44, 32, 53, 55, 93]，怎么转换成byte[]数组类型的[8, 100, 16, -17, -65, -67, 3, 26, 5, 55, 56, 57, 55, 57]

参考技术A 我需要把protobuf发送出去,需要打包到一个ByteArrayVarint里,数据头是数据长度local__buf=ByteArrayVarint.new()对于PB的Base128Varints编码__buf:writeVInt(request:ByteSize());应该是这样吧?那数据呢?我有一串字符串要放进__buf里面,是用writeByte()?还是writeStringUShort()??我在你的代码里面没发现有用到写字符的方法..追问

我想知道的是怎么如图转成[8, 100, 16, -17, -65, -67, 3, 26, 5, 55, 56, 57, 55, 57]这个@OnMessage

某些数组和字符串类型转换（转）

jbytearray转c++byte数组 

1 jbyte * arrayBody = env->GetByteArrayElements(data,0);   
2 jsize theArrayLengthJ = env->GetArrayLength(data);   
3 BYTE * starter = (BYTE *)arrayBody; 

jbyteArray 转 c++中的BYTE[] 

1 //jbytearray strIn  
2 jbyte * olddata = (jbyte*)env->GetByteArrayElements(strIn, 0);  
3 jsize  oldsize = env->GetArrayLength(strIn);  
4 BYTE* bytearr = (BYTE*)olddata;  
5 int len = (int)oldsize;  

 

C++中的BYTE[]转jbyteArray 

1 //nOutSize是BYTE数组的长度 BYTE pData[]  
2 jbyte *by = (jbyte*)pData;  
3 jbyteArray jarray = env->NewByteArray(nOutSize);  
4 env->SetByteArrayRegin(jarray, 0, nOutSize, by);  

jbyteArray 转 char * 

char* data = (char*)env->GetByteArrayElements(strIn, 0);  

 

char* 转jstring 

1.  1 jstring WindowsTojstring(JNIEnv* env, char* str_tmp)  
    2 {  
    3  jstring rtn=0;  
    4  int slen = (int)strlen(str_tmp);  
    5  unsigned short* buffer=0;  
    6  if(slen == 0)  
    7  {  
    8   rtn = env->NewStringUTF(str_tmp);  
    9  }  
   10  else  
   11  {  
   12   int length = MultiByteToWideChar(CP_ACP, 0, (LPCSTR)str_tmp, slen, NULL, 0);  
   13   buffer = (unsigned short*)malloc(length*2+1);  
   14   if(MultiByteToWideChar(CP_ACP, 0, (LPCSTR)str_tmp, slen, (LPWSTR)buffer, length) > 0)  
   15   {  
   16    rtn = env->NewString((jchar*)buffer, length);  
   17   }  
   18  }  
   19  if(buffer)  
   20  {  
   21   free(buffer);  
   22  }  
   23  return rtn;  
   24 }  

    

下面这个没有用过，刚看到，也写进来，以后如果遇到可以验证下看。 

jstring 转 char* 或者 const char* 

1 // jstring str  
2 const char *key = env->GetStringUTFChars(str, 0);  
3 //jboolean isOffer  
4 jsClient->modify(key, isOffer);  
5 env->ReleaseStringUTFChars(str, key);  

JNI 返回 jbyteArray 

 1 JNIEXPORT jbyteArray JNICALL Java_Test_getByteArray(JNIEnv *env, jobject obj)  
 2 {  
 3     jbyteArray firstMacArray = env->NewByteArray( 6 );  
 4     ......  
 5     jbyte *bytes = env->GetByteArrayElements( firstMacArray, 0);  
 6     for ( int i = 0; i < sizeof( pAdapterInfo->Address ); i++ )  
 7     {  
 8        bytes[ i ] = pAdapterInfo->Address[ i ];  
 9     }  
10   
11     env->SetByteArrayRegion(firstMacArray, 0, 6, bytes );  
12     return firstMacArray;  
13 }  

 

//jstring to char* 

 1 char* jstringTostring(JNIEnv* env, jstring jstr)  
 2 {          
 3   char* rtn = NULL;  
 4   jclass clsstring = env->FindClass("java/lang/String");  
 5   jstring strencode = env->NewStringUTF("utf-8");  
 6   jmethodID mid = env->GetMethodID(clsstring, "getBytes", "(Ljava/lang/String;)[B");  
 7   jbyteArray barr= (jbyteArray)env->CallObjectMethod(jstr, mid, strencode);  
 8   jsize alen = env->GetArrayLength(barr);  
 9   jbyte* ba = env->GetByteArrayElements(barr, JNI_FALSE);  
10   if (alen > 0)  
11   {  
12     rtn = (char*)malloc(alen + 1);  
13     memcpy(rtn, ba, alen);  
14     rtn[alen] = 0;  
15   }  
16   env->ReleaseByteArrayElements(barr, ba, 0);  
17   return rtn;  
18 }  

 

//char* to jstring 

1 jstring stoJstring(JNIEnv* env, const char* pat)  
2 {  
3 jclass strClass = env->FindClass("Ljava/lang/String;");  
4 jmethodID ctorID = env->GetMethodID(strClass, "<init>", "([BLjava/lang/String;)V");  
5 jbyteArray bytes = env->NewByteArray(strlen(pat));  
6 env->SetByteArrayRegion(bytes, 0, strlen(pat), (jbyte*)pat);  
7 jstring encoding = env->NewStringUTF("utf-8");  
8 return (jstring)env->NewObject(strClass, ctorID, bytes, encoding);  
9 }   

 

//将jstring类型转换成windows类型 

 1 char* jstringToWindows( JNIEnv *env, jstring jstr )  
 2 {  
 3 int length = (env)->GetStringLength(jstr );  
 4 const jchar* jcstr = (env)->GetStringChars(jstr, 0 );  
 5 char* rtn = (char*)malloc( length*2+1 );  
 6 int size = 0;  
 7 size = WideCharToMultiByte( CP_ACP, 0, (LPCWSTR)jcstr, length, rtn,(length*2+1), NULL, NULL );  
 8 if( size <= 0 )  
 9 return NULL;  
10 (env)->ReleaseStringChars(jstr, jcstr );  
11 rtn[size] = 0;  
12 return rtn;  
13 }  

 

 

//将windows类型转换成jstring类型 

 1 jstring WindowsTojstring( JNIEnv* env, char* str )  
 2 {  
 3 jstring rtn = 0;  
 4 int slen = strlen(str);  
 5 unsigned short * buffer = 0;  
 6 if( slen == 0 )  
 7 rtn = (env)->NewStringUTF(str );  
 8 else  
 9 {  
10 int length = MultiByteToWideChar( CP_ACP, 0, (LPCSTR)str, slen, NULL, 0 );  
11 buffer = (unsigned short *)malloc( length*2 + 1 );  
12 if( MultiByteToWideChar( CP_ACP, 0, (LPCSTR)str, slen, (LPWSTR)buffer, length ) >0 )  
13 rtn = (env)->NewString( (jchar*)buffer, length );  
14 }  
15 if( buffer )  
16 free( buffer );  
17 return rtn;  
18 }  
19 /*JNIEXPORT jstring JNICALL Java_test_cs_web_SWIFTAlianceCASmfTest_strcal 
20 (JNIEnv *env, jclass obj, jstring jstr1, jstring jstr2) 
21 { 
22 jbyteArray bytes = 0; 
23 jthrowable exc; 
24 char *pszResult = NULL;     
25 char *pszSTR1 = NULL; 
26 char *pszSTR2 = NULL; 
27  
28 pszSTR1 = jstringTostring(env, jstr1); 
29 pszSTR2 = jstringTostring(env, jstr2); 
30  
31  
32 int nlen = sizeof(char)*(strlen(pszSTR1)+strlen(pszSTR2)); 
33 pszResult = (char*)malloc(nlen); 
34 strcpy(pszResult, pszSTR1); 
35 strcat(pszResult, pszSTR2); 
36  
37 jstring jstrRe = stoJstring(env, pszResult); 
38 free(pszSTR1); 
39 free(pszSTR2); 
40 free(pszResult); 
41 return(jstrRe); 
42 } 
43 */  

 

 

jni object的使用 

每一个jni格式的dll中的object对应该java里面的一个类。 
如下例有一个 ObjData类，类中有成员bData ,Len 
public class ObjData { 
  public byte[]  bData; 
  public int Len;        
} 
//------------------------jni获得传过来的Object类型的变量objDataIn-------- 

jclass clazz =(env)->FindClass("ObjData"); 

//从传进来的对象中取出byte[] 

1 jfieldID byteData = (env)->GetFieldID(clazz,"bData","[B");  
2 jbyteArray pDataIn = (jbyteArray) (env)->GetObjectField(objDataIn, byteData);  
3 jsize theArrayLeng = env->GetArrayLength(pDataIn);  

 

//byte[]转为BYTE[] 

1 jbyte * arrayBody = env->GetByteArrayElements(pDataIn,0);   
2 BYTE * jDataIn = (BYTE *)arrayBody;   

//将BYTE数组转为jarray 

1 jbyte* byte = (jbyte*)jDataOut;      
2 jbyteArray jarray = env->NewByteArray(theArrayLeng);  
3 env->SetByteArrayRegion(jarray, 0, theArrayLeng, byte);  

 

//给每一个实例的变量付值 

1 (env)->SetObjectField(objDataIn,byteData,jarray);  
2 (env)->SetIntField(objDataIn,pDataInLen,jDataInLen);  
3 (env)->ReleaseByteArrayElements(pDataIn, arrayBody, 0);   

 

其他参考： 
Java 通过JNI调用C或者CPP代码 
http://blog.csdn.net/kenera/archive/2009/02/16/3895343.aspx 
http://apps.hi.baidu.com/share/detail/15732549 
http://dniit.blog.163.com/blog/static/28012894200842810332491/ 
http://hi.baidu.com/liangwind/blog/item/7dcce2c9729d1d1e7f3e6f49.html