最近项目中要用到socket通讯,由于涉及到组包问题,所以需要数据类型之间的来回转换,现在分享出来
如果想要请教Socket的问题请留言,我会随时回答的
1. int类型转16进制hexstring
- - (NSString *)hexFromInt:(NSInteger)val {
- return [NSString stringWithFormat:@"%X", val];
- }
2.16进制转换为NSData
- + (NSData *)dataFromHexString:(NSString *)hexString
- {
- NSAssert((hexString.length > 0) && (hexString.length % 2 == 0), @"hexString.length mod 2 != 0");
- NSMutableData *data = [[NSMutableData alloc] init];
- for (NSUInteger i=0; i<hexString.length; i+=2) {
- NSRange tempRange = NSMakeRange(i, 2);
- NSString *tempStr = [hexString substringWithRange:tempRange];
- NSScanner *scanner = [NSScanner scannerWithString:tempStr];
- unsigned int tempIntValue;
- [scanner scanHexInt:&tempIntValue];
- [data appendBytes:&tempIntValue length:1];
- }
- return data;
- }
3.NSData转16进制
- + (NSString *)hexStringFromData:(NSData *)data
- {
- NSAssert(data.length > 0, @"data.length <= 0");
- NSMutableString *hexString = [[NSMutableString alloc] init];
- const Byte *bytes = data.bytes;
- for (NSUInteger i=0; i<data.length; i++) {
- Byte value = bytes[i];
- Byte high = (value & 0xf0) >> 4;
- Byte low = value & 0xf;
- [hexString appendFormat:@"%x%x", high, low];
- }
- return hexString;
- }
4.NSString转int类型
- int a = [aStrinng intValue];
5.uint8转NSData(占两位)
- + (NSData *)byteFromUInt8:(uint8_t)val
- {
- NSMutableData *valData = [[NSMutableData alloc] init];
-
- unsigned char valChar[1];
- valChar[0] = 0xff & val;
- [valData appendBytes:valChar length:1];
-
- return [self dataWithReverse:valData];
- }
6.uint16 转NSData(占四位)
- + (NSData *)bytesFromUInt16:(uint16_t)val
- {
- NSMutableData *valData = [[NSMutableData alloc] init];
-
- unsigned char valChar[2];
- valChar[0] = 0xff & val;
- valChar[1] = (0xff00 & val) >> 8;
- [valData appendBytes:valChar length:2];
-
- return [self dataWithReverse:valData];
- }
7.Uint32 转NSData(占八位)
- + (NSData *)bytesFromUInt32:(uint32_t)val
- {
- NSMutableData *valData = [[NSMutableData alloc] init];
-
- unsigned char valChar[4];
- valChar[0] = 0xff & val;
- valChar[1] = (0xff00 & val) >> 8;
- valChar[2] = (0xff0000 & val) >> 16;
- valChar[3] = (0xff000000 & val) >> 24;
- [valData appendBytes:valChar length:4];
-
- return [self dataWithReverse:valData];
- }
8.NSString 转NSData
- NSData *data = [aString dataUsingEncoding:NSUTF8StringEncoding];
9.NSData转Uint8
- + (uint8_t)uint8FromBytes:(NSData *)fData
- {
- NSAssert(fData.length == 1, @"uint8FromBytes: (data length != 1)");
- NSData *data = fData;
- uint8_t val = 0;
- [data getBytes:&val length:1];
- return val;
- }
10.NSData转Uint16
- + (uint16_t)uint16FromBytes:(NSData *)fData
- {
- NSAssert(fData.length == 2, @"uint16FromBytes: (data length != 2)");
- NSData *data = [self dataWithReverse:fData];;
- uint16_t val0 = 0;
- uint16_t val1 = 0;
- [data getBytes:&val0 range:NSMakeRange(0, 1)];
- [data getBytes:&val1 range:NSMakeRange(1, 1)];
-
- uint16_t dstVal = (val0 & 0xff) + ((val1 << 8) & 0xff00);
- return dstVal;
- }
11.NSData转Uint32
- + (uint32_t)uint32FromBytes:(NSData *)fData
- {
- NSAssert(fData.length == 4, @"uint32FromBytes: (data length != 4)");
- NSData *data = [self dataWithReverse:fData];
-
- uint32_t val0 = 0;
- uint32_t val1 = 0;
- uint32_t val2 = 0;
- uint32_t val3 = 0;
- [data getBytes:&val0 range:NSMakeRange(0, 1)];
- [data getBytes:&val1 range:NSMakeRange(1, 1)];
- [data getBytes:&val2 range:NSMakeRange(2, 1)];
- [data getBytes:&val3 range:NSMakeRange(3, 1)];
-
- uint32_t dstVal = (val0 & 0xff) + ((val1 << 8) & 0xff00) + ((val2 << 16) & 0xff0000) + ((val3 << 24) & 0xff000000);
- return dstVal;
- }
12.NSData转Byte
- uint8_t byteArray[[data length]];
-
- [data getBytes:&byteArray length:[data length]];
-
-
- for (int i = 0; i < [data length] ; i++ ) {
- Byte byte = byteArray[i];
- NSLog(@"--byte%x",byte);
- }
13.NSData的拼接
- [data1 appendData:data2];
14.NSData转int (用CFSwapInt32BigToHost)
- NSData *data4 = [completeData subdataWithRange:NSMakeRange(0, 4)];
- int value = CFSwapInt32BigToHost(*(int*)([data4 bytes]));
以上可能会用到的反转字节序列代码
- + (NSData *)dataWithReverse:(NSData *)srcData
- {
-
-
-
-
-
- NSUInteger byteCount = srcData.length;
- NSMutableData *dstData = [[NSMutableData alloc] initWithData:srcData];
- NSUInteger halfLength = byteCount / 2;
- for (NSUInteger i=0; i<halfLength; i++) {
- NSRange begin = NSMakeRange(i, 1);
- NSRange end = NSMakeRange(byteCount - i - 1, 1);
- NSData *beginData = [srcData subdataWithRange:begin];
- NSData *endData = [srcData subdataWithRange:end];
- [dstData replaceBytesInRange:begin withBytes:endData.bytes];
- [dstData replaceBytesInRange:end withBytes:beginData.bytes];
- }
-
- return dstData;
- }
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