数据类型转换、密码安全加密MD5方法

来源：互联网发布：域名可以是汉字吗编辑：程序博客网时间：2024/05/21 23:39

数据类型转换

int转换data，byte在转换int

int m = 16;

NSData *IntToData1 = [NSDatadataWithBytes: &m length: sizeof(m)];

Byte *byteint = (Byte *)[IntToData1bytes];

NSLog(@"byteint:%s",byteint);

NSMutableArray *tableint = [NSMutableArrayarray];

for (int index =0; index <= [IntToData1 length]; index ++) {

[tableint addObject:@(byteint[index])];

}

NSLog(@"tableint:%@",tableint);

// Byte *byteintt = [&(16),0,0,0];

[self heightBytesToInt:byteint];

-(int )heightBytesToInt:(Byte[]) byte

{

int height = 0;

for (int i =0; i < [testDatalength]; i++)

{

if (byte[i] >= 0)

{

height = height + byte[i];

} else

{

height = height +256 + byte[i];

}

height = height * 256;

if (byte[3] >=0)

{

height = height + byte[3];

} else

{

height = height + 256 + byte[3];

}

return height;

}

//将低位字节转换为int

//在网络上传输的是以低位字节进行的； htonl，将int转换为网络字节序的int，ntohl，将网络字节序的int转换回来，-(int) lBytesToInt:(Byte[]) b，将以低位传输的网络字节序bytes数组转换为htonl之后对应的值

-(int) lBytesToInt:(Byte[]) byte

{

int height = 0;

for (int i =0; i < [testDatalength]; i++)

{

if (byte[[testDatalength]-i] >= 0)

{

height = height + byte[[testData length]-i];

} else

{

height = height + 256 + byte[[testDatalength]-i];

}

height = height * 256;

}

if (byte[0] >=0)

{

height = height + byte[0];

} else {

height = height + 256 + byte[0];

}

return height;

}

数据类型转换

// Byte转Data

NSData *dataqdd = [[NSDataalloc]initWithBytes:testBytelength:4];

NSLog(@"dataqdd:%@",dataqdd);

NSLog(@"subArray%@",subArray);

// ByteTOData

// NSData *data = [[NSData alloc]initWithBytes:(__bridge const void * _Nullable)(subArray) length:subArray.count];

NSData *data = [[NSDataalloc]initWithBytes:testBytelength:subArray.count];

NSLog(@"ByteTOData:%@",data);

// DataToString

NSString *string = [[NSStringalloc]initWithData:dataencoding:NSUTF8StringEncoding];

NSLog(@"DataToString:%@",string);

Byte定义

Byte byteintt = {16,0,0,0};

Data拼接在一起的实例：

NSString *da= @"大家好";

NSData *data1 = [dadataUsingEncoding:CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000)];

NSString *daya = @"请见谅";

NSData *data2 = [dayadataUsingEncoding:CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000)];

NSString *daya1 = @"来晚了";

NSData *data3 = [daya1dataUsingEncoding:CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000)];

NSMutableData *dataZong = [[NSMutableDataalloc]init];

[dataZong appendData:data1];

[dataZong appendData:data2];

[dataZong appendData:data3];

NSRange rang = NSMakeRange(0, [dataZong length]);

NSData *das = [dataZong subdataWithRange:rang];

NSString *stringqq = [dataweb DataWithForStringData:das];

NSLog(@"%@",stringqq);

转换成GB2312编码格式

NSStringEncoding encoding =CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);

密码安全加密MD5方法

+(NSString *) md5: (NSString *) inPutText

{

const char *cStr = [inPutText UTF8String];

unsigned char result[CC_MD5_DIGEST_LENGTH];

CC_MD5(cStr, strlen(cStr), result);

return [[NSString stringWithFormat:@"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",

result[0], result[1], result[2], result[3],

result[4], result[5], result[6], result[7],

result[8], result[9], result[10], result[11],

result[12], result[13], result[14], result[15]

] lowercaseString];

}

在使用访问服务器时，若传递的值在请求服务器之前就执行的话，在请求数据结束是使用block，代理，通知等提醒可以使用该数据了（进行传值），公司项目中的判断登陆是否成功和提醒窗口信息

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