NSString / NSData / char* 类型之间的转换

1. NSString转化为UNICODE String：(NSString*)fname ＝ @“Test”;char fnameStr[10];memcpy(fnameStr, [fname cStringUsingEncoding:NSUnicodeStringEncoding], 2*([fname length]));

与strcpy相比，memcpy并不是遇到'\0'就结束，而是一定会拷贝完n个字节

2. NSString 转化为 char *NSString * str＝ @“Test”;const char * a =[str UTF8String];

3.char * 转化为 NSString

NSString *str=[NSString stringWithCString  encoding:NSUTF8StringEncoding];

4. char * 转化 NSData 方法一：   char * a = (char*)malloc(sizeof(byte)*16);   NSData *data = [NSData dataWithBytes: a   length:strlen(a)]; 方法二：    转换为NSString： - (id)initWithUTF8String:(const char *)bytes    然后用NSString的 - (NSData *)dataUsingEncoding:(NSStringEncoding)encoding5. NSData 转化 char *  NSData data ；  char* a=[data bytes];6. NSData 转化 NSString;

NSData* data;

NSString* aStr= ［NSString alloc] initWithData:data   encoding:NSASCIIStringEncoding];

7. NSString 转化 NSData对象NSData* xmlData = [@"testdata" dataUsingEncoding:NSUTF8StringEncoding];http://blog.sina.com.cn/s/articlelist_1256141290_14_1.html

NSString 转化 NSURL  

 //NSURL *url = [NSURL URLWithString:[str   stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding ]]; 

NSString *urlString=[@"http://www.google.com/search?client=safari&rls=en&q=搜索&ie=UTF-8&oe=UTF-8" stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

NSURL 转化 NSString

NSURL *url=[NSURL URLWithString:urlString];

NSString *s=[[url absoluteString] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

//加密报文体格式：BASE64(前置证书版本号))| BASE64(RSA(报文加密密钥))| BASE64(3DES(报文原文))| BASE64(MD5(报文原文))
-(NSData*)encodeXML:(NSData*)data{
    NSString *tempstr;
    key = [[NSMutableString alloc] init];
    [key setString:@"123456781234567812345678"];
    
    NSMutableString *requeststr = [[NSMutableString alloc] init];
    FC_Plugin_KaTool *tool = [[FC_Plugin_KaTool alloc] init];
    
    NSString *version = @"1.0";
    NSData *tempData;
    tempData=[version dataUsingEncoding:NSUTF8StringEncoding];
    tempData=[tool.base64 encode:tempData];
    tempstr=[[NSString alloc] initWithData:tempData encoding:NSUTF8StringEncoding];
    [requeststr setString:tempstr];
    [requeststr appendString:@"|"];
    
//    NSBundle *bundle = [NSBundle bundleWithPath:[[NSBundle mainBundle] pathForResource:@"FCPay" ofType:@"bundle"]];
//    NSString *txtPath = [bundle pathForResource:@"PublicKey" ofType:@"txt"];
        NSString *txtPath = [[NSBundle mainBundle] pathForResource:@"PublicKey" ofType:@"txt"];
    NSString *publicKey = [[NSString  alloc] initWithContentsOfFile:txtPath encoding:NSUTF8StringEncoding error:nil];
    NSLog(@"publicKey = %@",publicKey);
    NSString *ret = [RSA encryptString:key publicKey:publicKey];
    
   
    
    tempData = [ret dataUsingEncoding:NSUTF8StringEncoding];
    tempData=[tool.base64 encode:tempData];
    
    tempstr = [[NSString alloc] initWithData:tempData encoding:NSUTF8StringEncoding];
    [requeststr appendString:tempstr];
    [requeststr appendString:@"|"];
    
    
    tempData=[tool._3Des encode:data key:key];
    tempData=[tool.base64 encode:tempData];
    tempstr = [[NSString alloc] initWithData:tempData encoding:NSUTF8StringEncoding];
    [requeststr appendString:tempstr];
    [requeststr appendString:@"|"];
    
    NSString *strData = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    NSString *strMd5PayPassword = [tool.md5 getMD5StringWithString:strData];
    tempData=[tool.base64 encode:[strMd5PayPassword dataUsingEncoding:NSUTF8StringEncoding]];
    tempstr = [[NSString alloc] initWithData:tempData encoding:NSUTF8StringEncoding];
    [requeststr appendString:tempstr];
    
    
    //    NSLog(@"requeststr------%@",requeststr);
    return [requeststr dataUsingEncoding:NSUTF8StringEncoding];
}
- (void)requestWithMethod:(RequestMegModel *)model completion:(void (^)(BOOL success, id object))completion
{
    NSMutableString *para = [[NSMutableString alloc] initWithCapacity:0];
    for (NSString *mkey in [model.dict allKeys]) {
        NSString *value = [model.dict objectForKey:mkey];
        [para appendString:[NSString stringWithFormat:@"<%@>"
                            "%@"
                            "</%@>",mkey,value,mkey]];
    }
    
    NSString *str = [NSString stringWithFormat:@"<?xml version=\"1.0\" encoding=\"utf-8\"?>"
                     "<FK application=\"%@\" terminalPhysicalNo=\"%@\">"
                     "%@"
                     "</FK>",model.application,model.terminalPhysicalNo,para];
    
    
    NSMutableURLRequest *request = [self requestWithMethod:model andStr:str];
    
    AFHTTPRequestOperation *op = [[AFHTTPRequestOperation alloc] initWithRequest:request];
    [op setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
        
//        NSInteger statusCode = [operation.response statusCode];
        NSData *data = responseObject;
        
        
        //解密   responseObject
        FC_Plugin_KaTool *tool=[[FC_Plugin_KaTool alloc] init];
        NSString *str=[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
        str=[str stringByReplacingOccurrencesOfString:@"\n" withString:@""];
        str=[str stringByReplacingOccurrencesOfString:@"\r" withString:@""];
        NSArray *array = [str componentsSeparatedByString:@"|"];
        
        if([array count]==3){
            switch ([[array objectAtIndex:0] intValue]) {
                case 1:
                {
                    //正确
                    data = [[array objectAtIndex:1] dataUsingEncoding:NSUTF8StringEncoding];
                    data = [tool.base64 decode:data];
                    data = [tool._3Des decode:data key:key];
                    
                    completion(YES,data);
                }
                    break;
                default:
                {
                    //错误
                    data = [[array objectAtIndex:2] dataUsingEncoding:NSUTF8StringEncoding];
                    data = [tool.base64 decode:data];
                    NSString *temp_1=[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] ;
                    LLBTAlert(temp_1);//捕捉到的错误信息
                    completion(NO,nil);
                }
                    break;
            }
        }else{
            completion(NO,nil);
        }
        
        //未加密时，返回的数据
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        completion(NO,error);
        LLBTAlert(@"对不起，通讯失败");
        NSLog(@"error = %@",error);
        completion(NO,nil);
    }];
    [op start];
}
-(NSString*)returnUrl
{
    NSString *plistPath = [[NSBundle mainBundle] pathForResource:@"Property List" ofType:@"plist"];
    NSDictionary *dictionary = [[NSDictionary alloc] initWithContentsOfFile:plistPath];
    NSString *tmpInfo = dictionary[@"waiWangUrl"];
    return tmpInfo;
}
- (NSMutableURLRequest *)requestWithMethod:(RequestMegModel *)method andStr:(NSString *)str
{
    
    
    NSString *stringUrl = [NSString stringWithFormat:@"%@/metapp/dispose/complex",[[LLBTRequest sharedInstance] returnUrl]];
    //    NSString *stringUrl = [NSString stringWithFormat:@"%@",kurl];
    NSLog(@"stringUrl = %@",stringUrl);
    NSString *encodeStr = [stringUrl stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSLog(@"encodeStr = %@",encodeStr);
    NSURL *url = [NSURL URLWithString:encodeStr];
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:20.0f];
    [request setHTTPMethod:@"POST"];
    [request addValue: @"application/xml;charset=utf-8" forHTTPHeaderField:@"Content-Type"];
    [request addValue:method.userId forHTTPHeaderField:@"userId"];
    
//     [request setHTTPBody:[str dataUsingEncoding:NSUTF8StringEncoding]];
//    NSLog(@"str-----%@",str);
//    NSLog(@"str-----%@",[str dataUsingEncoding:NSUTF8StringEncoding]);
    
    NSLog(@"str--------%@",str);
    NSLog(@"data--------%@",[self encodeXML:[str dataUsingEncoding:NSUTF8StringEncoding]]);
    [request setHTTPBody:[self encodeXML:[str dataUsingEncoding:NSUTF8StringEncoding]]];
    
    return request;
}