IOS开发---菜鸟学习之路--（十六）-将Image转换为Base64

我们直接在.m文件的引用头文件部分和 @interface AddPictureViewController ()

之间加入增加部分的代码

然后就可以使用图片转Base64了

#import "AddPictureViewController.h"

#import <QuartzCore/QuartzCore.h>

#import <QuartzCore/CoreAnimation.h>

#import <MobileCoreServices/UTCoreTypes.h>

 @interface NSData (MBBase64)

 + (id)dataWithBase64EncodedString:(NSString *)string;

 - (NSString *)base64Encoding;

 @end

 static const char encodingTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

 @implementation NSData (MBBase64)

 + (id)dataWithBase64EncodedString:(NSString *)string {

     if (string == nil)

         [NSException raise:NSInvalidArgumentException format:@""];

     if ([string length] == )

         return [NSData data];

     static char *decodingTable = NULL;

     if (decodingTable == NULL) {

         decodingTable = malloc();

         if (decodingTable == NULL)

             return nil;

         memset(decodingTable, CHAR_MAX, );

         NSUInteger i;

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

             decodingTable[(short)encodingTable[i]] = i;

     }

     const char *characters = [string cStringUsingEncoding:NSASCIIStringEncoding];

     if (characters == NULL)

         return nil;

     char *bytes = malloc((([string length] + ) / ) * );

     if (bytes == NULL)

         return nil;

     NSUInteger length = ;

     NSUInteger i = ;

     while (YES) {

         char buffer[];

         short bufferLength;

         for (bufferLength = ; bufferLength < ; i++) {

             if (characters[i] == '\0')

                 break;

             if (isspace(characters[i]) || characters[i] == '=')

                 continue;

             buffer[bufferLength] = decodingTable[(short)characters[i]];

             if (buffer[bufferLength++] == CHAR_MAX) {

                 free(bytes);

                 return nil;

             }

         }

         if (bufferLength == )

             break;

         if (bufferLength == ) {

             free(bytes);

             return nil;

         }

         bytes[length++] = (buffer[] << ) | (buffer[] >> );

         if (bufferLength > )

             bytes[length++] = (buffer[] << ) | (buffer[] >> );

         if (bufferLength > )

             bytes[length++] = (buffer[] << ) | buffer[];

     }

     realloc(bytes, length);

     return [NSData dataWithBytesNoCopy:bytes length:length];

 }

 - (NSString *)base64Encoding {

     if ([self length] == )

         return @"";

     char *characters = malloc((([self length] + ) / ) * );

     if (characters == NULL)

         return nil;

     NSUInteger length = ;

     NSUInteger i = ;

     while (i < [self length]) {

         char buffer[] = {,,};

         short bufferLength = ;

         while (bufferLength <  && i < [self length])

             buffer[bufferLength++] = ((char *)[self bytes])[i++];

         characters[length++] = encodingTable[(buffer[] & 0xFC) >> ];

         characters[length++] = encodingTable[((buffer[] & 0x03) << ) | ((buffer[] & 0xF0) >> )];

         if (bufferLength > )

             characters[length++] = encodingTable[((buffer[] & 0x0F) << ) | ((buffer[] & 0xC0) >> )];

         else characters[length++] = '=';

         if (bufferLength > )

             characters[length++] = encodingTable[buffer[] & 0x3F];

         else characters[length++] = '=';

     }

     return [[NSString alloc] initWithBytesNoCopy:characters length:length encoding:NSASCIIStringEncoding freeWhenDone:YES] ;

 }

 @end

增加部分的代码

@interface AddPictureViewController ()

@end

具体的转换操作如下

NSData *mydata=UIImageJPEGRepresentation(image , 0.4);

NSString *pictureDataString=[mydata base64Encoding];

如果需要传递到后台的话尽量进行编码操作

编码部分的方法如下

 - (NSString*)encodeURL:(NSString *)string

 {

     NSString *newString = (NSString *)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes( kCFAllocatorDefault, (CFStringRef)string, NULL, CFSTR(":/?#[]@!$ &'()*+,;=\"<>%{}|\\^~`"),kCFStringEncodingUTF8));

     if (newString) {

         return newString;

     }

     return @"";

 }

encodeURL

然后我们只需要像这样子使用就可以了

 -(void)zhuanhuan:(id)sender

 {

     NSData *mydata=UIImageJPEGRepresentation(contentimageview.image , 0.4);

     NSString *pictureDataString=[mydata base64Encoding];

     NSString *image=[self encodeURL:pictureDataString];

    // NSLog(pictureDataString);

 }

这边再给大家提供一个在线转换工具大家可以直接在上面进行Image与Base64之间的转换

http://www.vgot.net/test/image2base64.php

巴特西

IOS开发---菜鸟学习之路--（十六）-将Image转换为Base64

最新文章

热门文章