iphone - UIImage to base64 not working -


this question has answer here:

i'm trying convert uiimage base64 string , upload it.

this code:

nsdata *imagedata = uiimagejpegrepresentation(self.image, 0.2);   imagedatabase64 = [nsstring stringwithformat:@"data:image/jpeg;base64,%@", [imagedata base64encodedstring]];    nsurl *url = [nsurl urlwithstring:imagedatabase64];    nsdata *imgdata = [nsdata datawithcontentsofurl:url];  uiimage *ret = [uiimage imagewithdata:imgdata];   [imageview setimage:ret];

when set imagedatabase64 nsstring working.

update:

base64encodedstring code:

.h

void *newbase64decode(     const char *inputbuffer,     size_t length,     size_t *outputlength);  char *newbase64encode(     const void *inputbuffer,     size_t length,     bool separatelines,     size_t *outputlength);  @interface nsdata (base64)  + (nsdata *)datafrombase64string:(nsstring *)astring; - (nsstring *)base64encodedstring;  @end

.m

// // mapping 6 bit pattern ascii character. // static unsigned char base64encodelookup[65] = "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789+/";  // // definition "masked-out" areas of base64decodelookup mapping // #define xx 65  // // mapping ascii character 6 bit pattern. // static unsigned char base64decodelookup[256] = {     xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx,     xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx,     xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, 62, xx, xx, xx, 63,     52, 53, 54, 55, 56, 57, 58, 59, 60, 61, xx, xx, xx, xx, xx, xx,     xx,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,     15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, xx, xx, xx, xx, xx,     xx, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,     41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, xx, xx, xx, xx, xx,     xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx,     xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx,     xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx,     xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx,     xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx,     xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx,     xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx,     xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, xx, };  // // fundamental sizes of binary , base64 encode/decode units in bytes // #define binary_unit_size 3 #define base64_unit_size 4  // // newbase64decode // // decodes base64 ascii string in inputbuffer newly malloced // output buffer. // //  inputbuffer - source ascii string decode //  length - length of string or -1 (to specify strlen should used) //  outputlength - if not-null, on output contain decoded length // // returns decoded buffer. must free'd caller. length given //  outputlength. // void *newbase64decode(                       const char *inputbuffer,                       size_t length,                       size_t *outputlength) {     if (length == -1)     {         length = strlen(inputbuffer);     }      size_t outputbuffersize =     ((length+base64_unit_size-1) / base64_unit_size) * binary_unit_size;     unsigned char *outputbuffer = (unsigned char *)malloc(outputbuffersize);      size_t = 0;     size_t j = 0;     while (i < length)     {         //         // accumulate 4 valid characters (ignore else)         //         unsigned char accumulated[base64_unit_size];         size_t accumulateindex = 0;         while (i < length)         {             unsigned char decode = base64decodelookup[inputbuffer[i++]];             if (decode != xx)             {                 accumulated[accumulateindex] = decode;                 accumulateindex++;                  if (accumulateindex == base64_unit_size)                 {                     break;                 }             }         }          //         // store 6 bits each of 4 characters 3 bytes         //         // (uses improved bounds checking suggested alexandre colucci)         //         if(accumulateindex >= 2)             outputbuffer[j] = (accumulated[0] << 2) | (accumulated[1] >> 4);         if(accumulateindex >= 3)             outputbuffer[j + 1] = (accumulated[1] << 4) | (accumulated[2] >> 2);         if(accumulateindex >= 4)             outputbuffer[j + 2] = (accumulated[2] << 6) | accumulated[3];         j += accumulateindex - 1;     }      if (outputlength)     {         *outputlength = j;     }     return outputbuffer; }  // // newbase64encode // // encodes arbitrary data in inputbuffer base64 newly malloced // output buffer. // //  inputbuffer - source data encode //  length - length of input in bytes //  separatelines - if zero, no cr/lf characters added. otherwise //      cr/lf pair added every 64 encoded chars. //  outputlength - if not-null, on output contain encoded length //      (not including terminating 0 char) // // returns encoded buffer. must free'd caller. length given //  outputlength. // char *newbase64encode(                       const void *buffer,                       size_t length,                       bool separatelines,                       size_t *outputlength) {     const unsigned char *inputbuffer = (const unsigned char *)buffer;  #define max_num_padding_chars 2 #define output_line_length 64 #define input_line_length ((output_line_length / base64_unit_size) * binary_unit_size) #define cr_lf_size 2      //     // byte accurate calculation of final buffer size     //     size_t outputbuffersize =     ((length / binary_unit_size)      + ((length % binary_unit_size) ? 1 : 0))     * base64_unit_size;     if (separatelines)     {         outputbuffersize +=         (outputbuffersize / output_line_length) * cr_lf_size;     }      //     // include space terminating 0     //     outputbuffersize += 1;      //     // allocate output buffer     //     char *outputbuffer = (char *)malloc(outputbuffersize);     if (!outputbuffer)     {         return null;     }      size_t = 0;     size_t j = 0;     const size_t linelength = separatelines ? input_line_length : length;     size_t lineend = linelength;      while (true)     {         if (lineend > length)         {             lineend = length;         }          (; + binary_unit_size - 1 < lineend; += binary_unit_size)         {             //             // inner loop: turn 48 bytes 64 base64 characters             //             outputbuffer[j++] = base64encodelookup[(inputbuffer[i] & 0xfc) >> 2];             outputbuffer[j++] = base64encodelookup[((inputbuffer[i] & 0x03) << 4)                                                    | ((inputbuffer[i + 1] & 0xf0) >> 4)];             outputbuffer[j++] = base64encodelookup[((inputbuffer[i + 1] & 0x0f) << 2)                                                    | ((inputbuffer[i + 2] & 0xc0) >> 6)];             outputbuffer[j++] = base64encodelookup[inputbuffer[i + 2] & 0x3f];         }          if (lineend == length)         {             break;         }          //         // add newline         //         outputbuffer[j++] = '\r';         outputbuffer[j++] = '\n';         lineend += linelength;     }      if (i + 1 < length)     {         //         // handle single '=' case         //         outputbuffer[j++] = base64encodelookup[(inputbuffer[i] & 0xfc) >> 2];         outputbuffer[j++] = base64encodelookup[((inputbuffer[i] & 0x03) << 4)                                                | ((inputbuffer[i + 1] & 0xf0) >> 4)];         outputbuffer[j++] = base64encodelookup[(inputbuffer[i + 1] & 0x0f) << 2];         outputbuffer[j++] = '=';     }     else if (i < length)     {         //         // handle double '=' case         //         outputbuffer[j++] = base64encodelookup[(inputbuffer[i] & 0xfc) >> 2];         outputbuffer[j++] = base64encodelookup[(inputbuffer[i] & 0x03) << 4];         outputbuffer[j++] = '=';         outputbuffer[j++] = '=';     }     outputbuffer[j] = 0;      //     // set output length , return buffer     //     if (outputlength)     {         *outputlength = j;     }     return outputbuffer; }  @implementation nsdata (base64)  // // datafrombase64string: // // creates nsdata object containing base64 decoded representation of // base64 string 'astring' // // parameters: //    astring - base64 string decode // // returns autoreleased nsdata representation of base64 string // + (nsdata *)datafrombase64string:(nsstring *)astring {     nsdata *data = [astring datausingencoding:nsasciistringencoding];     size_t outputlength;     void *outputbuffer = newbase64decode([data bytes], [data length], &outputlength);     nsdata *result = [nsdata datawithbytes:outputbuffer length:outputlength];     free(outputbuffer);     return result; }  // // base64encodedstring // // creates nsstring object contains base 64 encoding of // receiver's data. lines broken @ 64 characters long. // // returns autoreleased nsstring being base 64 representation of //  receiver. // - (nsstring *)base64encodedstring {     size_t outputlength;     char *outputbuffer =     newbase64encode([self bytes], [self length], true, &outputlength);      nsstring *result = [[[nsstring alloc] initwithbytes:outputbuffer                                                  length:outputlength                                                encoding:nsasciistringencoding] autorelease];     free(outputbuffer);     return result; }  @end

duplicated question! try link: convert between uiimage , base64 string

in summary need encode nsdata string using base64 category such https://github.com/l4u/nsdata-base64/

the category provides following methods nsdata class can use convert nsdata nsstring (base 64 encoding) , forward.

+ (nsdata *)datafrombase64string:(nsstring *)astring; - (nsstring *)base64encodedstring;

try changing line:

imagedatabase64 = [nsstring stringwithformat:@"data:image/jpeg;base64,%@", [imagedata base64encodedstring]]

to 

nsstring *imagedatabase64encodedstring = [imagedata base64encodedstring];

to decode can use opposite method:

nsdata *theimagedata = [nsdata datafrombase64string:imagedatabase64encodedstring]; uiimage *ret = [uiimage theimagedata];

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