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copied!<p>I also had trouble finding working code for the iPhone that I could understand.</p> <p>I finally wrote this.</p> <pre><code>-(NSString *)Base64Encode:(NSData *)data; -(NSString *)Base64Encode:(NSData *)data{ //Point to start of the data and set buffer sizes int inLength = [data length]; int outLength = ((((inLength * 4)/3)/4)*4) + (((inLength * 4)/3)%4 ? 4 : 0); const char *inputBuffer = [data bytes]; char *outputBuffer = malloc(outLength+1); outputBuffer[outLength] = 0; //64 digit code static char Encode[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; //Start the count int cycle = 0; int inpos = 0; int outpos = 0; char temp; //Pad the last to bytes, the outbuffer must always be a multiple of 4. outputBuffer[outLength-1] = '='; outputBuffer[outLength-2] = '='; /* http://en.wikipedia.org/wiki/Base64 Text content M a n ASCII 77 97 110 8 Bit pattern 01001101 01100001 01101110 6 Bit pattern 010011 010110 000101 101110 Index 19 22 5 46 Base64-encoded T W F u */ while (inpos < inLength){ switch (cycle) { case 0: outputBuffer[outpos++] = Encode[(inputBuffer[inpos] & 0xFC) >> 2]; cycle = 1; break; case 1: temp = (inputBuffer[inpos++] & 0x03) << 4; outputBuffer[outpos] = Encode[temp]; cycle = 2; break; case 2: outputBuffer[outpos++] = Encode[temp|(inputBuffer[inpos]&0xF0) >> 4]; temp = (inputBuffer[inpos++] & 0x0F) << 2; outputBuffer[outpos] = Encode[temp]; cycle = 3; break; case 3: outputBuffer[outpos++] = Encode[temp|(inputBuffer[inpos]&0xC0) >> 6]; cycle = 4; break; case 4: outputBuffer[outpos++] = Encode[inputBuffer[inpos++] & 0x3f]; cycle = 0; break; default: cycle = 0; break; } } NSString *pictemp = [NSString stringWithUTF8String:outputBuffer]; free(outputBuffer); return pictemp; } </code></pre>

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