关于扫描POS二维码遇到的问题

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stringValue = POS90711012511000125110003000053000011000000000002000000000000000016224161398260MERCH¸£¿¨ÊÖ»ú

2016-08-15 10:00:38.891 YuFu_Wallet[1914:1168136] -[QRViewController comperterStr:] [Line 79] POS

907110125110001

25110003

000053

000011

000000000002

0000

000000000000

622416139826

stringValue 就是截取出来的商户名称，里面有奇异字符，需要转成中文；

折腾了2天，

modelPos.merName = [selfJapaneseToString:stringValue];

-(NSString *)JapaneseToString:(NSString *)string{

#if 0

NSStringEncoding dec = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingMacJapanese);

NSData *data=[string dataUsingEncoding:dec];

NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);

NSString *retStr = [[NSString alloc] initWithData:data encoding:enc];

DLog(@"retStr before = %@",retStr);

if (MBIsStringWithAnyText(retStr))//如果扫描中文乱码则需要处理，否则不处理

{

DLog(@"不为空");

// NSInteger max = [string length];

// char *nbytes = malloc(max + 1);

// for (int i = 0; i < max; i++)

// {

// unichar ch = [string characterAtIndex: i];

// nbytes[i] = (char) ch;

// }

// nbytes[max] = '\0';

// retStr =[NSString stringWithCString: nbytes

// encoding: enc];

}else{

DLog(@"为空");

retStr = [self gb_2312ToUTF_8WithString:string] ;

}

return retStr;

#endif

}

//多种格式支持

NSString *retStr;

// 1，utf8编码的

NSStringEncoding dec =CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingMacJapanese);

//根据字节来判断返回来的编码格式

constchar * sc = [string cStringUsingEncoding:dec];

if (sc ==NULL) {//正常编码

if (MBIsStringWithAnyText(retStr))//如果扫描中文乱码则需要处理，否则不处理

{

retStr=string;

}else{

DLog(@"为空");

retStr = [selfgb_2312ToUTF_8WithString:string] ;

}

- (NSString *)gb_2312ToUTF_8WithString:(NSString *)string

{

NSStringEncoding enc =CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);

NSData *data=[stringdataUsingEncoding:enc];

NSString *retStr = [[NSStringalloc] initWithData:dataencoding:enc];

DLog(@"retStr = %@",retStr);

if (retStr)//如果扫描中文乱码则需要处理，否则不处理

{

DLog(@"不为空");

NSInteger max = [stringlength];

char *nbytes =malloc(max + 1);

for (int i =0; i < max; i++)

{

unichar ch = [string characterAtIndex: i];

nbytes[i] = (char) ch;

}

nbytes[max] = '\0';

retStr =[NSStringstringWithCString: nbytes

encoding: enc];

}else{

DLog(@"为空");

// retStr = [[NSString alloc]initWithData:[self dataByHealingGB18030Stream:data] encoding:enc];

}

return retStr;

}

}elseif (IsTextUTF8(sc,strlen(sc))) {

NSData *data=[stringdataUsingEncoding:dec];

retStr = [[NSStringalloc] initWithData:dataencoding:NSUTF8StringEncoding];

}else{

NSData *data=[stringdataUsingEncoding:dec];

NSStringEncoding enc =CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);

retStr = [[NSStringalloc] initWithData:dataencoding:enc];

}

//找的一些c的方法来判断返回来串的编码格式

int isgbk(constchar *s, size_t ns)

{

if(ns >2 && (uint8_t)*s >=0x81 && (uint8_t)*s <=0xfe

&& (

((uint8_t)*(s+1) >=0x80 && (uint8_t)*(s+1) <=0x7e)

|| ((uint8_t)*(s+1) >=0xa1 && (uint8_t)*(s+1) <=0xfe)

)

{

return1;

}

return0;

}

int IsTextUTF8(constchar* str,long length)

{

int i;

int nBytes=0;//UFT8可用1-6个字节编码,ASCII用一个字节

unsignedchar chr;

bool bAllAscii=true;//如果全部都是ASCII,说明不是UTF-8

for(i=0;i<length;i++)

{

chr= *(str+i);

if( (chr&0x80) !=0 ) // 判断是否ASCII编码,如果不是,说明有可能是UTF-8,ASCII用7位编码,但用一个字节存,最高位标记为0,o0xxxxxxx

bAllAscii= false;

if(nBytes==0)//如果不是ASCII码,应该是多字节符,计算字节数

{

if(chr>=0x80)

{

if(chr>=0xFC&&chr<=0xFD)

nBytes=6;

elseif(chr>=0xF8)

nBytes=5;

elseif(chr>=0xF0)

nBytes=4;

elseif(chr>=0xE0)

nBytes=3;

elseif(chr>=0xC0)

nBytes=2;

else

{

returnfalse;

}

nBytes--;

}

else//多字节符的非首字节,应为 10xxxxxx

{

if( (chr&0xC0) !=0x80 )

{

returnfalse;

}

nBytes--;

}

if( nBytes >0 ) //违返规则

{

returnfalse;

}

if( bAllAscii )//如果全部都是ASCII,说明不是UTF-8

{

returnfalse;

}

returntrue;

}

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