Question

我正在尝试将多个字节数组（存储在SQL Server 2008 R2中作为varbinary（8000））转换为图像，以便将它们附加到PDF文件（下面是数据示例）。我一直得到“参数无效”。从MemoryStream创建Image时。对此有何帮助？

MemoryStream memoryStream = new MemoryStream(byteArray);
Image image = Image.FromStream(memoryStream);
Bitmap bitmap = new Bitmap(image);

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 2FFC1F9C1FE3FC2FFC1F1C2FFC1FC3FC2FFC1F3C1FE3FC2FFC1F0C2FFC1F8C3FFC1E7C1FE3FC2FFC1FEC2000FC3FFC1CFC1FE3FC3FFC2000FC3FF9FC1FE3FC9FF3FC1FE3FC8FFC1FE7FC1FE3FC8FFC1F0C1FFC1FE3FC8FFC1E7C1FFC1FE3FC8FFC1CFC1FFC1FE3FC8FF8FC1FFC1FE3FC8FFC1E0C1FFC1FE3FC8FFC1F8C1FFC1FE3FC8FFC1FC1FC1FE3FC9FF8FC1FE3FC9FFC1E7C1FE3FC9FFC1F0C1FE3FC9FFC1FE7E3FCAFF7E3FC2FFC1FCC300C4FF3E3FC2FFC1F8C3001FC3FF3E3FC2FFC1F1C3FF8FC3FF9E3FC2FFC1F1C3FF87C3FFC1CE3FC2FFC1F1C3FFC1F3C3FFC1CE3FC2FFC1F1C3FFC1F9C3FFC1EE3FC2FFC1F1C3FFC1FCC3FFC1E43FC2FFC1F1C3FFC1FE7FC2FFC1E43FC2FFC1F1C4FF3FC2FFC1E43FC2FFC1F1C4FF1FC2FFC1F03FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C3FFC1FE7FC2FFC1F83FC2FFC1F1C3FFC1FEC3FFC1F83FC2FFC1F1C3FFC1F9C3FFC1F83FC2FFC1F1C3FFC1F3C3FFC1F83FC2FFC1F1C3FFC1F7C3FFC1F83FC2FFC1F1C2FFC1FE0FC3FFC1F83FC2FFC1F0C3003FC3FFC1F83FC2FFC1F8C20001C4FFC1F83FC2FFC1FCC20003C4FFC1FC3FCAFFC1E43FCAFFC1E43FCAF FC1E43FCAFFC1EE3FCAFFC1EE3FCAFFC1CE3FCAFF3E3FCAFF7E3FC9FFC1FE7E3FC9FFC1FE7E3FC9FFC1FCC1FE3FC9FFC1F1C1FE3FC9FFC1C3C1FE3FC9FFC1DFC1FE3FC9FF9FC1FE3FC8FFC1E07FC1FE3FC8FFC1C1C1FFC1FE1FC7FF001FC1FFC1FEC9003FC1FFC1FE80C700C3FFC1FEC1C0C700C3FFC1FE

Answer 1

这是一个

% file output 
output: PCX ver. 2.8 image data, with palette

在linux下我只是将你的十六进制流从纯文本转换为一个名为output

的二进制文件

回波 “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 1F9C1FE3FC2FFC1F1C2FFC1FC3FC2FFC1F3C1FE3FC2FFC1F0C2FFC1F8C3FFC1E7C1FE3FC2FFC1FEC2000FC3FFC1CFC1FE3FC3FFC2000FC3FF9FC1FE3FC9FF3FC1FE3FC8FFC1FE7FC1FE3FC8FFC1F0C1FFC1FE3FC8FFC1E7C1FFC1FE3FC8FFC1CFC1FFC1FE3FC8FF8FC1FFC1FE3FC8FFC1E0C1FFC1FE3FC8FFC1F8C1FFC1FE3FC8FFC1FC1FC1FE3FC9FF8FC1FE3FC9FFC1E7C1FE3FC9FFC1F0C1FE3FC9FFC1FE7E3FCAFF7E3FC2FFC1FCC300C4FF3E3FC2FFC1F8C3001FC3FF3E3FC2FFC1F1C3FF8FC3FF9E3FC2FFC1F1C3FF87C3FFC1CE3FC2FFC1F1C3FFC1F3C3FFC1CE3FC2FFC1F1C3FFC1F9C3FFC1EE3FC2FFC1F1C3FFC1FCC3FFC1E43FC2FFC1F1C3FFC1FE7FC2FFC1E43FC2FFC1F1C4FF3FC2FFC1E43FC2FFC1F1C4FF1FC2FFC1F03FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C3FFC1FE7FC2FFC1F83FC2FFC1F1C3FFC1FEC3FFC1F83FC2FFC1F1C3FFC1F9C3FFC1F83FC2FFC1F1C3FFC1F3C3FFC1F83FC2FFC1F1C3FFC1F7C3FFC1F83FC2FFC1F1C2FFC1FE0FC3FFC1F83FC2FFC1F0C3003FC3FFC1F83FC2FFC1F8C20001C4FFC1F83FC2FFC1FCC20003C4FFC1FC3FCAFFC1E43FCAFFC1E43FCAFFC1E 43FCAFFC1EE3FCAFFC1EE3FCAFFC1CE3FCAFF3E3FCAFF7E3FC9FFC1FE7E3FC9FFC1FE7E3FC9FFC1FCC1FE3FC9FFC1F1C1FE3FC9FFC1C3C1FE3FC9FFC1DFC1FE3FC9FF9FC1FE3FC8FFC1E07FC1FE3FC8FFC1C1C1FFC1FE1FC7FF001FC1FFC1FEC9003FC1FFC1FE80C700C3FFC1FEC1C0C700C3FFC1FE” | xxd -p -r＆gt;输出

然后使用file output的简单部分从实用程序file获取文件格式的名称。

Answer 2

首先，请确保您知道编码，因为Image.FromStream方法只知道有限数量的格式。

确保将MemoryStream的位置正确设置为0，而不是结尾 - 否则，任何读取将从最后开始显示为空，而不是从头开始。

另外，请注意

此构造函数不公开基础流。 GetBuffer抛出UnauthorizedAccessException。1

因此，这可能是由Bitmap处理底层流的一些方式引起的。如果需要，尝试制作一个空的内存流，将字节复制到其中，然后重置位置

MemoryStream memoryStream = new MemoryStream();
foreach(var b in byteArray) memoryStream.WriteByte(b);
memoryStream.Position = 0;
Image image = Image.FromStream(memoryStream);

Answer 3

您提供的字节数组长度为1117个字节。它不能被4或3整除，所以我很确定图像不是原始字节，实际上是以某种图像格式编码的。

Image.FromStream（）方法无法在不知道格式的情况下解码编码图像，并且您提供的字节数组不指定该格式是什么。因此，您提供的参数无效。如果您知道图像的格式，则可以尝试在图像的其余部分之前将字符串插入字节数组中，并查看是否有帮助。很奇怪你有图像而不是它的标题，尽管它看起来也不像是64字符串。

在不知道图像格式的情况下，将这些字节数组转换为图像可能很困难。有什么方法可以找出它们是什么吗？如何检索检索的图像数据？

将字节数组转换为图像会引发“参数无效”。

3 个答案: