ios 中Nsstirng,Nsdata,char,byte,UIImage 之间的转换
2016-08-10 10:27
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object-c 继承于c语言,因此最基础的数据之间的转换自然也成为oc 的基础。下面记录一下这些数据之间转换的具体方法。
1.NSData 与 NSString
NSDate->NSString
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NSString *testString =[[NSString alloc] initWithData:testData encoding:NSUTF8StringEncoding];
NSString ->NSData
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NSData *aData =[aString dataUsingEncoding:NSUTF8StringEncoding];
2.NSData 与char
NSData->char*
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char *test=(char*)[data bytes];
char ->byte
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for (int i=0;i<strlen(test);i++)
printf("%02X",test[i]&0xff);//16进制
char*->NSData
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byte *testData =malloc(sizeOf(byte)*16);
NSData *content =[NSData dataWithBytes:tempData length:16];
3.byte与NSData
NSData->Byte数组
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NSString *testString = @"1234567890";
NSData *testData = [testString dataUsingEncoding: NSUTF8StringEncoding];
Byte *testByte = (Byte*)[testData bytes];
for(int i=0;i<[testDatalength];i++)
printf("testByte = %d ",testByte[i]);
Byte数组-> NSData
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Byte byte[] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23};
NSData *adata = [[NSData alloc] initWithBytes:byte length:24];
Byte数组->16进制数
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Byte *bytes = (Byte *)[aData bytes];
NSString *hexStr=@"";
for(int i=0;i<[encryDatalength];i++)
{
NSString *newHexStr = [NSString stringWithFormat:@"%x",bytes[i]&0 xff]; ///16进制数
if([newHexStr length]==1)
hexStr = [NSString stringWithFormat:@"%@0%@",hexStr,newHexStr];
else
hexStr = [NSString stringWithFormat:@"%@%@",hexStr,newHexStr];
}
NSLog(@"bytes 的16进制数为:%@",hexStr);
16进制数->Byte数组
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///// 将16进制数据转化成Byte 数组
NSString *hexString = @"3e435fab9c34891f";//16进制字符串
int j=0;
Byte bytes[128];
///3ds key的Byte数组, 128位
for(int i=0;i<[hexString length];i++)
{
int int_ch; /// 两位16进制数转化后的10进制数
unichar hex_char1 = [hexString characterAtIndex:i]; ////两位16进制数中的第一位(高位*16)
int int_ch1;
if(hex_char1 >= ""0"" &&hex_char1 <=""9"")
int_ch1 = (hex_char1-48)*16; ////0 的Ascll - 48
else if(hex_char1 >= ""A"" &&hex_char1 <=""F"")
int_ch1 = (hex_char1-55)*16;//// A 的Ascll - 65
else
int_ch1 = (hex_char1-87)*16;//// a 的Ascll - 97
i++;
unichar hex_char2 = [hexString characterAtIndex:i]; ///两位16进制数中的第二位(低位)
int int_ch2;
if(hex_char2 >= ""0"" &&hex_char2 <=""9"")
int_ch2 = (hex_char2-48);//// 0 的Ascll - 48
else if(hex_char1 >= ""A"" &&hex_char1 <=""F"")
int_ch2 = hex_char2-55; //// A 的Ascll - 65
else
int_ch2 = hex_char2-87; //// a 的Ascll - 97
int_ch = int_ch1+int_ch2;
NSLog(@"int_ch=%d",int_ch);
bytes[j] = int_ch; ///将转化后的数放入Byte数组里
j++;
}
NSData *newData = [[NSData alloc] initWithBytes:bytes length:128];
NSLog(@"newData=%@",newData);
4.NSData 与UIImage
NSData ->UIImage
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UIImage *testImage =[UIImage imageWithData:testImageData];
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//从本地文件沙盒中取并转化为NSData
NSString *path =[[NSBundle mainBundle] bundlePath];
NSString *name =[NSString stringWithFormat:@"testImage.png"];
NSString *finalPath =[path stringByAppendingPathComponent:name];
NSData *imageData =[NSData dataWithContentFile:finalPath];
UIimage *testImage =[UIimage imageWithData:ImageData];
UIImage->NSData
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NSData *imageData =UIImagePNGRepresentation(testImage);
1.NSData 与 NSString
NSDate->NSString
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NSString *testString =[[NSString alloc] initWithData:testData encoding:NSUTF8StringEncoding];
NSString ->NSData
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NSData *aData =[aString dataUsingEncoding:NSUTF8StringEncoding];
2.NSData 与char
NSData->char*
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char *test=(char*)[data bytes];
char ->byte
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for (int i=0;i<strlen(test);i++)
printf("%02X",test[i]&0xff);//16进制
char*->NSData
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byte *testData =malloc(sizeOf(byte)*16);
NSData *content =[NSData dataWithBytes:tempData length:16];
3.byte与NSData
NSData->Byte数组
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NSString *testString = @"1234567890";
NSData *testData = [testString dataUsingEncoding: NSUTF8StringEncoding];
Byte *testByte = (Byte*)[testData bytes];
for(int i=0;i<[testDatalength];i++)
printf("testByte = %d ",testByte[i]);
Byte数组-> NSData
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Byte byte[] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23};
NSData *adata = [[NSData alloc] initWithBytes:byte length:24];
Byte数组->16进制数
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Byte *bytes = (Byte *)[aData bytes];
NSString *hexStr=@"";
for(int i=0;i<[encryDatalength];i++)
{
NSString *newHexStr = [NSString stringWithFormat:@"%x",bytes[i]&0 xff]; ///16进制数
if([newHexStr length]==1)
hexStr = [NSString stringWithFormat:@"%@0%@",hexStr,newHexStr];
else
hexStr = [NSString stringWithFormat:@"%@%@",hexStr,newHexStr];
}
NSLog(@"bytes 的16进制数为:%@",hexStr);
16进制数->Byte数组
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///// 将16进制数据转化成Byte 数组
NSString *hexString = @"3e435fab9c34891f";//16进制字符串
int j=0;
Byte bytes[128];
///3ds key的Byte数组, 128位
for(int i=0;i<[hexString length];i++)
{
int int_ch; /// 两位16进制数转化后的10进制数
unichar hex_char1 = [hexString characterAtIndex:i]; ////两位16进制数中的第一位(高位*16)
int int_ch1;
if(hex_char1 >= ""0"" &&hex_char1 <=""9"")
int_ch1 = (hex_char1-48)*16; ////0 的Ascll - 48
else if(hex_char1 >= ""A"" &&hex_char1 <=""F"")
int_ch1 = (hex_char1-55)*16;//// A 的Ascll - 65
else
int_ch1 = (hex_char1-87)*16;//// a 的Ascll - 97
i++;
unichar hex_char2 = [hexString characterAtIndex:i]; ///两位16进制数中的第二位(低位)
int int_ch2;
if(hex_char2 >= ""0"" &&hex_char2 <=""9"")
int_ch2 = (hex_char2-48);//// 0 的Ascll - 48
else if(hex_char1 >= ""A"" &&hex_char1 <=""F"")
int_ch2 = hex_char2-55; //// A 的Ascll - 65
else
int_ch2 = hex_char2-87; //// a 的Ascll - 97
int_ch = int_ch1+int_ch2;
NSLog(@"int_ch=%d",int_ch);
bytes[j] = int_ch; ///将转化后的数放入Byte数组里
j++;
}
NSData *newData = [[NSData alloc] initWithBytes:bytes length:128];
NSLog(@"newData=%@",newData);
4.NSData 与UIImage
NSData ->UIImage
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UIImage *testImage =[UIImage imageWithData:testImageData];
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//从本地文件沙盒中取并转化为NSData
NSString *path =[[NSBundle mainBundle] bundlePath];
NSString *name =[NSString stringWithFormat:@"testImage.png"];
NSString *finalPath =[path stringByAppendingPathComponent:name];
NSData *imageData =[NSData dataWithContentFile:finalPath];
UIimage *testImage =[UIimage imageWithData:ImageData];
UIImage->NSData
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NSData *imageData =UIImagePNGRepresentation(testImage);
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