將十六進制字符串轉換爲圖像

Question

我正在使用FormsConnect的iPad應用程序將簽名導出到XML。 從App的輸出如下：

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

現在我想要使用此代碼這個十六進制字符串轉換回的圖像：

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; 
    } 

但我不斷收到參數無效，當試圖加載流到一個位圖。我提出的問題到應用的開發者，這裏是他的迴應：

親愛的亞歷克斯

的數據存儲在二進制，十六進制格式。以下是關於如何讀取二進制數據並將其寫回爲jpg的說明。

byteData [I] =（位[I * 2] SHL 4）+（位[I * 2 + 1]）

上面假定數字已經轉換爲數字0至15。如果您試圖通過以較大的塊（例如整數）寫入內存來優化您的腳本，則需要考慮到字節順序。所有主要的CPU體系結構都是小端的，這意味着這些數字與它們的字節以與它們的實際值相反的順序被存儲（即，0x1234在內存中存儲爲0x3412）。

下面是從表單中提取BLOB數據兩種不同的腳本：

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; 

如果有人可以幫助我在此，我將非常感激。 親切的問候， 亞歷克斯

Answer 1

你的問題不是十六進制轉換例程，它是原始數據編碼不正確。基於它的所有零點，我會說這只是一個原始位圖！我的猜測是，生成該數據的程序的作者在輸出之前忘記將位圖編碼爲特定的文件格式。