C# 将十六进制字符串转换为图像

我正在使用FormsConnect应用程序将签名导出到XML。 应用程序的输出如下所示：

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

现在，我尝试使用以下代码将此十六进制字符串转换回图像：

 Bitmap newImage = new Bitmap(new MemoryStream(StringToByteArray(hex)));
 
 public static byte[] StringToByteArray(string hex)
    {
        hex = hex.Substring(2, hex.Length - 2);
        if (hex.Length % 2 != 0)
        {
            throw new ArgumentException(String.Format(CultureInfo.InvariantCulture, "The binary key cannot have an odd number of digits: {0}", hex));
        }

        byte[] HexAsBytes = new byte[hex.Length / 2];
       
        for (int index = 0; index < HexAsBytes.Length; index++)
        {
            string byteValue = hex.Substring(index * 2, 2);
            HexAsBytes[index] = byte.Parse(byteValue, NumberStyles.HexNumber, CultureInfo.InvariantCulture);
        }

        return HexAsBytes;
    }

Bitmap newImage=新位图（新内存流（StringToByteArray（十六进制））；
公共静态字节[]StringToByteArray（字符串十六进制）
{
十六进制=十六进制子字符串（2，十六进制长度-2）；
如果（十六进制长度%2！=0）
{
抛出新的ArgumentException（String.Format（CultureInfo.InvariantCulture，“二进制键不能有奇数位数：{0}”，十六进制））；
}
字节[]十六字节=新字节[hex.Length/2]；
for（int index=0；index

但是，当试图将流加载到位图中时，我一直认为参数无效。我向应用程序开发者提出了这个问题，以下是他的回答：

亲爱的亚历克斯：

数据以二进制、十六进制格式存储。下面是关于如何读取二进制数据并将其写回jpg的说明

字节数据[i]=（数字[i*2]shl 4）+（数字[i*2+1]）

以上假设数字已转换为0到15之间的数字。如果您试图通过以较大的块（例如整数）写入内存来优化脚本，则需要考虑endianness。所有主要的CPU架构都是little endian，这意味着数字存储时字节的排列顺序与实际值相反（即0x1234在内存中存储为0x3412）

下面是用于从表单中提取blob数据的两个不同脚本：

1。Python脚本：
迭代FormConnect xml文件中附加到图像字段的每个照片
数据=R[i]
要从每个blob的前面剥离“0x”
a=数据[2:]
迭代每个字节，将二进制int写入数组
对于范围内的i（len（a）/2）：
b=（int（bin）（int（a[i*2]，16）），2）你的问题不是十六进制转换例程，而是原始数据没有正确编码。基于其中所有的零，我认为这只是一个原始位图！我猜生成该数据的程序的作者在输出位图之前忘记了将位图编码为特定的文件格式。
我在中转换了给定的十六进制字符串到字节数组，并将其保存到文件中。我的图像查看器无法识别此文件。给定数组的长度为4381字节。由于长度是奇数，因此无法调整数组的endianess。正如Gabe所说，这在任何endianess中都不是有效的jpg文件。没有
FF D8 FF E0
标头，标头后也没有JFIF。感谢Gabe该应用程序的更新解决了这个问题。
 1. Python Script:
iterate over each photo attached to image field in FormConnect xml file
data = R[i]

to strip '0x' off front of each blob
a = data[2:]
iterate over each byte, write as binary int to array
for i in range(len(a)/2):
                b = (int(bin(int(a[i*2],16)),2)<<4) + int(bin(int(a[i*2+1],16)),2)
                data.append(b)
 write array to binary file

F = file(outFile,'wb')
data.tofile(F)
F.close()


PHP Script:
$pic = "";
$field = substr($field,2);
header("Content-Type: image/jpeg"); 
$pic = pack("H*", $field);
echo $pic;