This was already addressed for android as lighthouse ticket\r\n#1604, below are Bill's original notes from the\r\nbug.
\r\nYou cannot use Titanium.Utils.base64encode &\r\nTitanium.Utils.base64decode successfully to round-trip the encoding\r\n/ decoding of a blob. In other words, you don't get back the same\r\nset of bytes that you originally started with.
\r\nFailcase app.js (make sure you have KS_nav_ui.png in your\r\nResources folder; it's there by default with new projects):
\r\nvar win = Ti.UI.createWindow({fullscreen: true,\r\nexitOnClose:true});
\r\nvar file = Ti.Filesystem.getFile('KS_nav_ui.png');
\r\nvar blob1 = file.read();
\r\nvar base64 = Ti.Utils.base64encode(blob1);
\r\nvar blob2 = Ti.Utils.base64decode(base64);
var thumbnail1 = Titanium.UI.createView({left: 0, top: 0, width:\r\n46, height: 43});
\r\nthumbnail1.backgroundImage = 'KS_nav_ui.png'; // the orig, which\r\nobviously works
\r\nvar thumbnail2 = Titanium.UI.createView({left: 56, top: 0, width:\r\n46, height: 43});
\r\nvar thumbnail3 = Titanium.UI.createView({left: 112, top: 0, width:\r\n46, height: 43});
\r\nwin.add(thumbnail1); win.add(thumbnail2); win.add(thumbnail3);
var tempDir = Titanium.Filesystem.createTempDirectory();
\r\ntempDir.createDirectory();
// Blob from original file var file1 =\r\nTitanium.Filesystem.getFile(tempDir.nativePath, 'file1.png');
\r\nfile1.write(blob1);
\r\nthumbnail2.backgroundImage = file1.nativePath;
// Base64 encoded-then-decoded blob var file2 =\r\nTitanium.Filesystem.getFile(tempDir.nativePath, 'file2.png');
\r\nfile2.write(blob2);
\r\nthumbnail3.backgroundImage = file2.nativePath;
win.open();
\r\nYou should see three identical images when that runs. Instead,\r\nyou'll see only two.
Hi, I'm an end user of Titanium that had some trouble with this\nrecently.
\nThe problem on iPhone is that the TiBlob is converted to a\nString first using UtilsModule.convertToString grabbing the\nTiBlob.text field. If the TiBlob is an image or file you need to\nuse the TiBlob.data field.
\nI managed to get it to work using the attached code. I figured\nit was better to use the TiBlob.data rather than TiBlob.text\nalways, as if you really must base64 encode a String from a blob\nyou can change your Javascript to Ti.Utils.base64encode(blob.text)\nand it will still encode it.
\n-(TiBlob*)base64encode:(id)args {
\nENSURE_SINGLE_ARG(args,NSObject);\nconst char *data;\nsize_t len;\nif ([args isKindOfClass:[NSString class]])\n{\n data = [args UTF8String];\n len = [args length];\n}\nelse if ([args isKindOfClass:[TiBlob class]])\n{\n data = [[(TiBlob*)args data] bytes];\n len = [[(TiBlob*)args data] length];\n}\nelse\n{\n THROW_INVALID_ARG(@\"invalid type\");\n}\n\nsize_t outsize = EstimateBas64EncodedDataSize(len);\nchar *base64Result = malloc(sizeof(char)*outsize);\nsize_t theResultLength = outsize;\n\nbool result = Base64EncodeData(data, len, base64Result, &theResultLength);\nif (result)\n{\n NSData *theData = [NSData dataWithBytes:base64Result length:theResultLength];\n free(base64Result);\n return [[[TiBlob alloc] initWithData:theData mimetype:@\"application/octet-stream\"] autorelease];\n} \nfree(base64Result);\nreturn nil;\n\n}
I also created this function because I wanted the TiBlob I\ncreated to be an Image with width/height attributes. Is it possible\nto
\n1) Add it to UtilsModule.m
\nor
\n2) Have an optional parameter that determines the type of TiBlob to\nreturn
\nor
\n3) Maybe even better have an TiBlob be able to create another\nTiBlob of type TiBlobTypeImage from the data within it. Maybe at\nthe same time you could provide a constructor in Javascript to let\nus create our own TiBlobs from our own data.
-(TiBlob*)base64decodeImage:(id)args {
\nENSURE_SINGLE_ARG(args,NSObject);\n\nNSString *str = [self convertToString:args];\n\nconst char *data = [str UTF8String];\nsize_t len = [str length];\n\nsize_t outsize = EstimateBas64DecodedDataSize(len);\nchar *base64Result = malloc(sizeof(char)*outsize);\nsize_t theResultLength = outsize;\n\nbool result = Base64DecodeData(data, len, base64Result, &theResultLength);\nif (result)\n{\n NSData *theData = [NSData dataWithBytes:base64Result length:theResultLength];\n free(base64Result);\n return [[[TiBlob alloc] initWithImage:[UIImage imageWithData:theData]] autorelease];\n} \nfree(base64Result);\nreturn nil;\n\n}