将字节数组转换为图像会引发“参数无效”。答案

【问题标题】：Converting Byte Array To Image Throws "Parameter is not valid."将字节数组转换为图像会引发“参数无效”。
【发布时间】：2014-05-15 20:08:45
【问题描述】：

我正在尝试将几个字节数组（作为 varbinary(8000) 存储在 SQL Server 2008 R2 中）转换为图像，以便我可以将它们附加到 PDF 文件中（数据示例如下）。我不断收到“参数无效”。从 MemoryStream 创建图像时。有什么帮助吗？

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

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 2FFC1F9C1FE3FC2FFC1F1C2FFC1FC3FC2FFC1F3C1FE3FC2FFC1F0C2FFC1F8C3FFC1E7C1FE3FC2FFC1FEC2000FC3FFC1CFC1FE3FC3FFC2000FC3FF9FC1FE3FC9FF3FC1FE3FC8FFC1FE7FC1FE3FC8FFC1F0C1FFC1FE3FC8FFC1E7C1FFC1FE3FC8FFC1CFC1FFC1FE3FC8FF8FC1FFC1FE3FC8FFC1E0C1FFC1FE3FC8FFC1F8C1FFC1FE3FC8FFC1FC1FC1FE3FC9FF8FC1FE3FC9FFC1E7C1FE3FC9FFC1F0C1FE3FC9FFC1FE7E3FCAFF7E3FC2FFC1FCC300C4FF3E3FC2FFC1F8C3001FC3FF3E3FC2FFC1F1C3FF8FC3FF9E3FC2FFC1F1C3FF87C3FFC1CE3FC2FFC1F1C3FFC1F3C3FFC1CE3FC2FFC1F1C3FFC1F9C3FFC1EE3FC2FFC1F1C3FFC1FCC3FFC1E43FC2FFC1F1C3FFC1FE7FC2FFC1E43FC2FFC1F1C4FF3FC2FFC1E43FC2FFC1F1C4FF1FC2FFC1F03FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C3FFC1FE7FC2FFC1F83FC2FFC1F1C3FFC1FEC3FFC1F83FC2FFC1F1C3FFC1F9C3FFC1F83FC2FFC1F1C3FFC1F3C3FFC1F83FC2FFC1F1C3FFC1F7C3FFC1F83FC2FFC1F1C2FFC1FE0FC3FFC1F83FC2FFC1F0C3003FC3FFC1F83FC2FFC1F8C20001C4FFC1F83FC2FFC1FCC20003C4FFC1FC3FCAFFC1E43FCAFFC1E43FCAF FC1E43FCAFFC1EE3FCAFFC1EE3FCAFFC1CE3FCAFF3E3FCAFF7E3FC9FFC1FE7E3FC9FFC1FE7E3FC9FFC1FCC1FE3FC9FFC1F1C1FE3FC9FFC1C3C1FE3FC9FFC1DFC1FE3FC9FF9FC1FE3FC8FFC1E07FC1FE3FC8FFC1C1C1FFC1FE1FC7FF001FC1FFC1FEC9003FC1FFC1FE80C700C3FFC1FEC1C0C700C3FFC1FE P>

【问题讨论】：

听起来字节数组不是有效的图像。
图片格式是什么？它看起来不像 Image 类可以理解的任何常见图像格式。
我不知道图像格式，但我知道结果应该是许多徽标之一。

标签： c# bytearray varbinary

【解决方案1】：

这是一个

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

在 linux 下，我只是将您的十六进制流从纯文本转换为名为 output 的二进制文件

回声 “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 1F9C1FE3FC2FFC1F1C2FFC1FC3FC2FFC1F3C1FE3FC2FFC1F0C2FFC1F8C3FFC1E7C1FE3FC2FFC1FEC2000FC3FFC1CFC1FE3FC3FFC2000FC3FF9FC1FE3FC9FF3FC1FE3FC8FFC1FE7FC1FE3FC8FFC1F0C1FFC1FE3FC8FFC1E7C1FFC1FE3FC8FFC1CFC1FFC1FE3FC8FF8FC1FFC1FE3FC8FFC1E0C1FFC1FE3FC8FFC1F8C1FFC1FE3FC8FFC1FC1FC1FE3FC9FF8FC1FE3FC9FFC1E7C1FE3FC9FFC1F0C1FE3FC9FFC1FE7E3FCAFF7E3FC2FFC1FCC300C4FF3E3FC2FFC1F8C3001FC3FF3E3FC2FFC1F1C3FF8FC3FF9E3FC2FFC1F1C3FF87C3FFC1CE3FC2FFC1F1C3FFC1F3C3FFC1CE3FC2FFC1F1C3FFC1F9C3FFC1EE3FC2FFC1F1C3FFC1FCC3FFC1E43FC2FFC1F1C3FFC1FE7FC2FFC1E43FC2FFC1F1C4FF3FC2FFC1E43FC2FFC1F1C4FF1FC2FFC1F03FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C4FF1FC2FFC1F83FC2FFC1F1C3FFC1FE7FC2FFC1F83FC2FFC1F1C3FFC1FEC3FFC1F83FC2FFC1F1C3FFC1F9C3FFC1F83FC2FFC1F1C3FFC1F3C3FFC1F83FC2FFC1F1C3FFC1F7C3FFC1F83FC2FFC1F1C2FFC1FE0FC3FFC1F83FC2FFC1F0C3003FC3FFC1F83FC2FFC1F8C20001C4FFC1F83FC2FFC1FCC20003C4FFC1FC3FCAFFC1E43FCAFFC1E43FCAFFC1E 43FCAFFC1EE3FCAFFC1EE3FCAFFC1CE3FCAFF3E3FCAFF7E3FC9FFC1FE7E3FC9FFC1FE7E3FC9FFC1FCC1FE3FC9FFC1F1C1FE3FC9FFC1C3C1FE3FC9FFC1DFC1FE3FC9FF9FC1FE3FC8FFC1E07FC1FE3FC8FFC1C1C1FFC1FE1FC7FF001FC1FFC1FEC9003FC1FFC1FE80C700C3FFC1FEC1C0C700C3FFC1FE” | xxd -p -r >输出

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

【讨论】：

非常感谢！知道十六进制流是 PCX 图像后，我使用 Magick.NET 将字节数组转换为 bmp 并将 bmp 插入 PDF 文档。再次感谢！

【解决方案2】：

首先，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 Position 正确设置为 0，而不是设置到末尾 - 否则，任何从末尾开始的读取看起来都是空的，而不是从开头开始。

另外，请注意

此构造函数不公开底层流。 GetBuffer 抛出 UnauthorizedAccessException.1

因此，这可能是由 Bitmap 处理底层流的某些方式引起的。如果需要，尝试创建一个空的内存流，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);

【讨论】：

如果我无法知道数据被编码为什么格式，我能做什么？

【解决方案3】：

您提供的字节数组是 1117 字节长。这不能被 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未指定该格式是什么。因此，您提供的参数无效。如果您知道图像的格式，您可以尝试在图像的其余部分之前将标头插入字节数组，看看是否有帮助。很好奇你有图像但没有它的标题，虽然它似乎也不是一个 base-64 字符串。

如果不知道图像格式，可能很难将这些字节数组转换为图像。有什么办法可以找出它们是什么吗？检索到的图像数据如何存储？

【讨论】：

不，我们无法找出图像是什么。我真的不需要存储转换后检索到的数据，我只需要在一张票（这是一个 PDFSharp 文档）上绘制图像/徽标。