我已经意识到我的第一个问题不会被回答，因为PHP无法处理这种格式： https : //stackoverflow.com/questions/1376103/how-to-convert-metafilepict-to-bitmapped-image-in -php ，所以我有一个C＃控制台应用程序，它将从MS SQL 2008 db或Access 2007中加载图像，然后将它们保存到目录中。
最初，这些图像被作为Windows媒体文件（WMF）保存到访问数据库中。
所以，我有以下代码，在最后一行有错误：
byte[] mybytes = (byte[])sdr["LocationMap"]; System.IO.MemoryStream ms = new System.IO.MemoryStream(mybytes); System.Drawing.Bitmap b = (System.Drawing.Bitmap)System.Drawing.Image.FromStream(ms);sql server中的“LocationMap”列是varbinary，Access中是image。
如何从两个数据库中的一个数据库加载它，以便将它保存为位图图像？
这是我的错误：
A first chance exception of type 'System.ArgumentException' occurred in System.Drawing.dll System.Transactions Critical: 0 : <TraceRecord xmlns="http://schemas.microsoft.com/2004/10/E2ETraceEvent/TraceRecord" Severity="Critical"><TraceIdentifier>http://msdn.microsoft.com/TraceCodes/System/ActivityTracing/2004/07/Reliability/Exception/Unhandled</TraceIdentifier><Description>Unhandled exception</Description><AppDomain>ConvertWMFToFile.vshost.exe</AppDomain><Exception><ExceptionType>System.ArgumentException, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</ExceptionType><Message>Parameter is not valid.</Message><StackTrace> at System.Drawing.Image.FromStream(Stream stream, Boolean useEmbeddedColorManagement, Boolean validateImageData) at System.Drawing.Image.FromStream(Stream stream)更新：这是我另一次失败的尝试：
//imageBytes = sdr.GetSqlBytes(2); //var stream = imageBytes.Stream; //stream.Seek(0, SeekOrigin.Begin); //locmod.LocationImage = new Metafile(stream);Update2：我刚试过这个，得到了一个通用的GDI +错误：
byte[] mybytes = (byte[])sdr["LocationMap"]; var f = File.Create("tempfile.wmf"); f.Write(mybytes, 0, locmod.LocationImageBytes.Length); f.Close(); var myimage = new Metafile("tempfile.wmf");错误：
System.Runtime.InteropServices.ExternalException was unhandled Message="A generic error occurred in GDI+." Source="System.Drawing" ErrorCode=-2147467259 StackTrace: at System.Drawing.Imaging.Metafile..ctor(String filename)I have realized that my first question won't be answerable, since php can't deal with this format: https://stackoverflow.com/questions/1376103/how-to-convert-metafilepict-to-bitmapped-image-in-php, so I have a C# console application that will just load up the images, from either an MS SQL 2008 db, or Access 2007, and then save them to a directory.
The images were saved as Windows Media File (WMF) to the access database, originally.
So, I have the following code, which has an error on the last line:
byte[] mybytes = (byte[])sdr["LocationMap"]; System.IO.MemoryStream ms = new System.IO.MemoryStream(mybytes); System.Drawing.Bitmap b = (System.Drawing.Bitmap)System.Drawing.Image.FromStream(ms);The column "LocationMap" in sql server is varbinary, and in Access is image.
How can I load this from one of the two databases, so I can save it as a bitmapped image?
This was my error:
A first chance exception of type 'System.ArgumentException' occurred in System.Drawing.dll System.Transactions Critical: 0 : <TraceRecord xmlns="http://schemas.microsoft.com/2004/10/E2ETraceEvent/TraceRecord" Severity="Critical"><TraceIdentifier>http://msdn.microsoft.com/TraceCodes/System/ActivityTracing/2004/07/Reliability/Exception/Unhandled</TraceIdentifier><Description>Unhandled exception</Description><AppDomain>ConvertWMFToFile.vshost.exe</AppDomain><Exception><ExceptionType>System.ArgumentException, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</ExceptionType><Message>Parameter is not valid.</Message><StackTrace> at System.Drawing.Image.FromStream(Stream stream, Boolean useEmbeddedColorManagement, Boolean validateImageData) at System.Drawing.Image.FromStream(Stream stream)UPDATE: This was my other failed attempt:
//imageBytes = sdr.GetSqlBytes(2); //var stream = imageBytes.Stream; //stream.Seek(0, SeekOrigin.Begin); //locmod.LocationImage = new Metafile(stream);Update2: I just tried this and got a generic GDI+ error:
byte[] mybytes = (byte[])sdr["LocationMap"]; var f = File.Create("tempfile.wmf"); f.Write(mybytes, 0, locmod.LocationImageBytes.Length); f.Close(); var myimage = new Metafile("tempfile.wmf");Error:
System.Runtime.InteropServices.ExternalException was unhandled Message="A generic error occurred in GDI+." Source="System.Drawing" ErrorCode=-2147467259 StackTrace: at System.Drawing.Imaging.Metafile..ctor(String filename)最满意答案
您可能会在Stephen Lebans的示例数据库中找到代码：
将OLE字段中的数据写入磁盘这不是特定于WMF的 - 它适用于任何OLE字段。 我在4个月前使用它从客户端数据库中提取了一堆Word文档，并且它工作正常（尽管只有少数填充了旧版Word的字段无法提取）。
You might find the code in Stephen Lebans' sample database illuminating:
Write data in OLE fields to diskThat's not specific to WMF -- it works for any OLE field. I used it 4 months ago to extract a bunch of Word docs from a client database and it worked fine (though a few of the fields that were populated with older versions of Word could not be extracted).
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