我有一个NSData,其图像解码为Base 64。
我想在UIImage中转换此数据,但是....
NSData * data = [[NSData alloc] initWithContentsOfFile:@"/Users/.../Library/Caches/images/david.txt"];
UIImage * i = [[UIImage alloc] initWithData:data];
NSLog(@"%@",i);
NSData *datai = UIImagePNGRepresentation(i);
UIImage * i2 = [[UIImage alloc] initWithData:datai];
imagen = [[UIImageView alloc] initWithImage:i2];
[imagen setFrame:CGRectMake(0, 0, 320, 480)];
imagen->变量
我知道数据中的内容是正确的,但是在我的控制台中:
[Session started at 2011-08-24 20:44:25 +0200.]
2011-08-24 20:44:30.579 P[50194:207] (null)
我已经用这个 objective-c 代码解码了:
- (NSData *)base64DataFromString: (NSString *)string
{
unsigned long ixtext, lentext;
unsigned char ch, inbuf[3], outbuf[4];
short i, ixinbuf;
Boolean flignore, flendtext = false;
const unsigned char *tempcstring;
NSMutableData *theData;
if (string == nil)
{
return [NSData data];
}
ixtext = 0;
tempcstring = (const unsigned char *)[string UTF8String];
lentext = [string length];
theData = [NSMutableData dataWithCapacity: lentext];
ixinbuf = 0;
while (true)
{
if (ixtext >= lentext)
{
break;
}
ch = tempcstring [ixtext++];
flignore = false;
if ((ch >= 'A') && (ch <= 'Z'))
{
ch = ch - 'A';
}
else if ((ch >= 'a') && (ch <= 'z'))
{
ch = ch - 'a' + 26;
}
else if ((ch >= '0') && (ch <= '9'))
{
ch = ch - '0' + 52;
}
else if (ch == '+')
{
ch = 62;
}
else if (ch == '=')
{
flendtext = true;
}
else if (ch == '/')
{
ch = 63;
}
else
{
flignore = true;
}
if (!flignore)
{
short ctcharsinbuf = 3;
Boolean flbreak = false;
if (flendtext)
{
if (ixinbuf == 0)
{
break;
}
if ((ixinbuf == 1) || (ixinbuf == 2))
{
ctcharsinbuf = 1;
}
else
{
ctcharsinbuf = 2;
}
ixinbuf = 3;
flbreak = true;
}
inbuf [ixinbuf++] = ch;
if (ixinbuf == 4)
{
ixinbuf = 0;
outbuf[0] = (inbuf[0] << 2) | ((inbuf[1] & 0x30) >> 4);
outbuf[1] = ((inbuf[1] & 0x0F) << 4) | ((inbuf[2] & 0x3C) >> 2);
outbuf[2] = ((inbuf[2] & 0x03) << 6) | (inbuf[3] & 0x3F);
for (i = 0; i < ctcharsinbuf; i++)
{
[theData appendBytes: &outbuf[i] length: 1];
}
}
if (flbreak)
{
break;
}
}
}
return theData;
}
我用这个Java代码编码:
File f = new File(url);
BufferedInputStream bi = new BufferedInputStream(new FileInputStream(f));
int bytes = (int) f.length();
byte[] buffer = new byte[bytes];
int readBytes = bi.read(buffer);
bi.close();
/*BASE 64 ENCODE*/
byte[] encodedString = Base64.encode(buffer);
String image = new String(encodedString, "UTF8");
最佳答案
NSData
不会神奇地解码base64,您必须自己做。在this blog post中有一个示例如何执行此操作。
关于iphone - 问题UIImage initWithData,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/7180634/