字節數組的UIImage Objective-C的

Question

我有一個ByteArray

unsigned char *outputData = (unsigned char *)malloc(sizeof(unsigned char) * w * h * 4); 

    outputData[y * h * 4 + x * 4 + 0] = all; //alpha value 
    outputData[y * h * 4 + x * 4 + 1] = red; //red value 
    outputData[y * h * 4 + x * 4 + 2] = gre; //green value 
    outputData[y * h * 4 + x * 4 + 3] = blu; //blue value 

      //h... total image height 
      //y,x ... current y and x value from the matrix 

現在我想這個數據轉換成UIImage的。這是如何運作的？我試過了：

NSData *outdata = [NSData dataWithBytes:outputData length:sizeof(unsigned char) * w * h * 4]; 
UIImage *newimage = [UIImage imageWithData:outdata]; 

但是，這似乎不是正確的解決方案。請幫忙。

Answer 1

CGColorSpaceRef colorSpace=CGColorSpaceCreateDeviceRGB(); 
    CGContextRef bitmapContext=CGBitmapContextCreate(outputData, w, h, 8, 4*w, colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrderDefault); 
    CFRelease(colorSpace); 
    free(outputData); 
    CGImageRef cgImage=CGBitmapContextCreateImage(bitmapContext); 
    CGContextRelease(bitmapContext); 

    UIImage * newimage = [UIImage imageWithCGImage:cgImage]; 
    CGImageRelease(cgImage);