安卓跟iOS通訊的時(shí)候，你會(huì)發(fā)現(xiàn)你接到對(duì)方發(fā)的json串解析不了，對(duì)，因?yàn)榘沧吭诎l(fā)送json的時(shí)候，安卓默認(rèn)的在數(shù)據(jù)的Byte前兩位加上了data總長(zhǎng)度，所以我們?cè)诮馕龅臅r(shí)候要先把接收到數(shù)據(jù)的前兩位解析出需要接受數(shù)據(jù)的大小長(zhǎng)度。然后我們就知道這段data只接收解析出長(zhǎng)度的大小。防止數(shù)據(jù)錯(cuò)亂！
還是上代碼
/**
*解析Json
*
*@param client_NeedFD客戶端標(biāo)識(shí)FD
*
*@return Json格式字符串
*/
- (NSString*)RecognizeDataWithClientFD:(int)client_NeedFD{
NSString*needReturnIn =nil;
charbuf[1024];
intallLength =0;
intbits =0;
NSInteger br;
//判斷是否是第一次1.第一次判斷前兩位長(zhǎng)度
BOOLisFirst =YES;
NSMutableData*mutableData = [[NSMutableDataalloc]init];
while((br =recv(client_NeedFD, buf,1024,0))!=-1) {//接受的長(zhǎng)度
//取到所有json
allLength +=br;
NSData*headData = [[NSDataalloc]initWithBytes:buflength:br];
[mutableDataappendData:headData];
if(isFirst) {
bits = [selfbytes_to_IntWithData:headDataLength:0];//應(yīng)該接受的長(zhǎng)度
isFirst =NO;
}
//1.如果已經(jīng)接收的總長(zhǎng)度allLehgth小于應(yīng)該接收的長(zhǎng)度Bits繼續(xù)接收
//2.否則break跳出該循環(huán)
//NSLog(@"allLength = %dbr = %d收到左右的JSON Break",allLength,br);
if((allLength -2) == bits) {
NSString*jsonString = [selfconvertToNSStringFromJavaUTF8:mutableDataWithLength:bits];
needReturnIn = jsonString;
break;
}
//memset(buf, 0, sizeof(buf));//總的作用：將已開(kāi)辟內(nèi)存空間s的首n個(gè)字節(jié)的值設(shè)為值c。函數(shù)常用于內(nèi)存空間初始化
if(br ==0) {
close(client_NeedFD);
break;
}
}returnneedReturnIn;
}
- (int)bytes_to_IntWithData:(NSData*)data Length:(int)len{//取出前兩位，計(jì)算出本次應(yīng)該接受的長(zhǎng)度
intvalue=0;
Byte*byte = (Byte*)[databytes];
if([datalength]>2) {//解析前兩位
value = (int)(byte[1+len] &0xFF)|(byte[0+len]<<8&0xFF00);
}
returnvalue;
}
- (NSString*) convertToNSStringFromJavaUTF8 : (NSData*) data WithLength:(int)len{
intlength = (int)[datalength];
constuint8_t*bytes = (constuint8_t*)[databytes];
if(length <2) {
returnnil;
}
bytes +=2;
return[[NSStringalloc]initWithBytes:byteslength:lenencoding:NSUTF8StringEncoding];
#if0 //+2就代表從第三位開(kāi)始，下面是例子，可以改變數(shù)字，自己試試
NSString *str1 =@"123456";
NSData *data1 = [str1 dataUsingEncoding:NSUTF8StringEncoding];
intlength = (int)[data1 length];
constuint8_t *bytes = (constuint8_t*)[data1 bytes];
NSString *json = [[NSString alloc] initWithBytes:bytes+2length:length-2encoding:NSUTF8StringEncoding];
XCLog(@"%@",json);
#endif
}
二、發(fā)送的時(shí)候記得也在發(fā)送的data前面加上你要發(fā)送json的長(zhǎng)度
- (NSInteger)sendSocketWithJson:(NSString*)jsonString SockFD:(int)sock_fd{
NSData*mutableData = [[DealwithJson shareInstance]NeedJsonString:jsonString];
Byte*sendByte = (Byte*)[mutableDatabytes];
returnsend(sock_fd, sendByte, [mutableDatalength],0);
}
//下面是在bytes前面加上長(zhǎng)度，注意bytes的高地位
- (NSData*)NeedJsonString:(NSString*)jsonStirng {
NSData*data1 = [jsonStirngdataUsingEncoding:NSUTF8StringEncoding];
#if __LP64__ || NS_BUILD_32_LIKE_64
//long sendSuccess;
NSIntegerbits = [data1length];
#else
//int sendSuccess;
intbits = [data1 length];
#endif
shortbit = bits;
NSData*data2 = [NSDatadataWithBytes:&bitlength:sizeof(bit)];//低位高位
Byte*testByte = (Byte*)[data2bytes];
/**
*修改byte高地位--適應(yīng)安卓
*/
intone = testByte[0];
testByte[0] = testByte[1];
testByte[1] = one;
NSData*data3 = [[NSDataalloc]initWithBytes:testBytelength:2];
NSMutableData*mutableData = [[NSMutableDataalloc]initWithData:data3];//先把長(zhǎng)度加上
[mutableDataappendData:data1];//要發(fā)出的數(shù)據(jù)
returnmutableData;
}
