Objective C中UIImage到Hex的转换

本文关键字：Hex 转换 UIImage Objective | 更新日期: 2023-09-27 18:24:12

我使用以下C#编码将上传的位图图像转换为十六进制。我需要遵循算法来实现目标C中的相同目标。假设我有一个UIImageView，其中有一个从图片库中选择的图像。我需要将这个选定的图像转换为十六进制并写入一个文本文件。

有人请帮我把这个代码转换成目标C。我在IOS开发方面有一些知识，但在图像处理方面没有太多知识。

这是我的代码，

            Bitmap bm1 = (Bitmap)pictureBox1.Image;
            int PictureWidth = pictureBox1.Image.Width;
            int PictureHeight = pictureBox1.Image.Height;
            int PictureX;
            int PictureY;
            int NVImageWidth;
            int NVImageHeight;
            NVImageWidth = PictureWidth;
            NVImageHeight = PictureHeight;
            int Quotient;
            int Remainder;
            int wp;
            wp = 0;
            StreamWriter sw = new StreamWriter("D:''Test.txt");
            for (PictureX = 0; PictureX <= PictureWidth - 1; PictureX++)
            {
                for (PictureY = 0; PictureY <= NVImageHeight - 1; PictureY++)
                {
                    Color c1 = bm1.GetPixel(PictureX, PictureY);
                    if ((PictureY % 8) == 0)
                    {
                        wp = 0;
                        wp = (c1.G!=0) ? 0 : 1;
                    }
                    else if ((PictureY % 8) == 7)
                    {
                        wp = (wp << 1) | ((c1.G!=0) ? 0 : 1);
                        sw.Write(string.Format("%{0:x2}", wp));
                    }
                    else
                    {
                        wp = (wp << 1) | ((c1.G!=0) ? 0 : 1);
                    }
                }
            }
            sw.Close();

Objective C中UIImage到Hex的转换

我有一个建议：

首先将UIImage转换为NSData。然后将NSData转换为十六进制。

例如，

//converting to hexadecimal
    -(NSString*)hexRepresentationWithSpaces_AS:(BOOL)spaces
    {
        const unsigned char* bytes = (const unsigned char*)[self bytes];
        NSUInteger nbBytes = [self length];
        //If spaces is true, insert a space every this many input bytes (twice this many output characters).
        static const NSUInteger spaceEveryThisManyBytes = 4UL;
        //If spaces is true, insert a line-break instead of a space every this many spaces.
        static const NSUInteger lineBreakEveryThisManySpaces = 4UL;
        const NSUInteger lineBreakEveryThisManyBytes = spaceEveryThisManyBytes * lineBreakEveryThisManySpaces;
        NSUInteger strLen = 2*nbBytes + (spaces ? nbBytes/spaceEveryThisManyBytes : 0);
        NSMutableString* hex = [[NSMutableString alloc] initWithCapacity:strLen];
        for(NSUInteger i=0; i<nbBytes; ) {
            [hex appendFormat:@"%02X", bytes[i]];
            //We need to increment here so that the every-n-bytes computations are right.
            ++i;
            if (spaces) {
                if (i % lineBreakEveryThisManyBytes == 0) [hex appendString:@"'n"];
                else if (i % spaceEveryThisManyBytes == 0) [hex appendString:@" "];
            }
        }
        return [hex autorelease];
    }
NSData *imageData = UIImagePNGRepresentation(myImage.image);
NSString* hex = [imageData hexRepresentationWithSpaces_AS:YES];
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