问题描述
在我的计划，我有一个要求，播放或分析Windows图元（WMF和EMF）。我已经通过MSDN和谷歌挖，我也来最接近的是图形。 EnumerateMetafile方法。我可以得到它的工作，在我的EnumerateMetafileProc回调被调用，然后我可以叫PlayRecord。现在缺少的，是如何得到有用的数据指出，回调
In my program, I have a requirement to "playback" or "parse" windows metafiles (WMF and EMF). I have dug through MSDN and Google, and the closest I have come is the Graphics. EnumerateMetafile method. I can get it to work, in that my EnumerateMetafileProc callback is called, and I can then call PlayRecord. What is missing, is how to get usefull data out of that callback.
例我看了看：的
回调有RECORDTYPE参数，它是一个枚举。嗯，这看起来是有用的，但他们似乎没有办法将数据转换成任何有用的类型。
The callback has a recordType parameter, which is an ENUM. Well this looks useful, except their seems to be no way to cast the data into any useful type.
我的目标是要回放的WMF / EMF的建立，这样我就可以进行函数调用其中有像（DrawLine的，DrawPoint，DrawArc）方法专业图形类。从某种意义上说，我重新创建WMF / EMF在一个完全不同的格式（转换）拉。
My goal is to play back the creation of the WMF/EMF, so that I can make function calls to a specialized graphics class which has methods like (DrawLine, DrawPoint, DrawArc). In a sense, I am re-creating the WMF/EMF drawing in a completely different format (Converting).
在任何帮助，这是非常赞赏。
Any help in this is extremely appreciated.
推荐答案
的，不幸的是围绕Win32 API的一个非常，非常薄的一层。在EMF的每条记录，你会得到一个非托管内存地址记录专用结构。什么它可能不包含文档 - ！不过呢，也没有太多的在Win32世界要么去上
Graphics.EnumerateMetafile, is unfortunately a very, very thin layer around the Win32 APIs. For each record in the EMF, you get an unmanaged memory address for the record-specific struct. No documentation about what it might contain - but then, there isn't much to go on in the Win32 world either.
所以，你需要查阅古籍
包括使用EMF播放API示例程序。
This book came with a code sample CD-ROM that includes sample programs to use the EMF playback API.
这让你有两个问题。
-
这本书显然是绝版，所以请确保任何使用复制你购买包括工作CD-ROM。
The book is apparently out of print, so make sure that any used copy you buy includes a working CD-ROM.
的示例代码都是用C / C ++，这将是一个不平凡的任务申报必要的互操作为用于描述所有的EMF记录的100个左右结构。
The sample code is all in C/C++ and it will be a non-trivial task to declare the necessary interop for the 100 or so structures that are used to describe all the EMF records.
所以，另一种办法是，在申报.NET一个巨大的接口，具有每GDI的方法叫你需要拦截，然后用C ++ / CLI适应例如C ++代码，以便它调用到你的每个记录巨大的接口。
So another approach might be to declare a huge interface in .NET that has a method for every GDI call you need to intercept, and then use C++/CLI to adapt the example C++ code so it calls onto your huge interface for each record.
更新
虽然EMF播放MSDN文档不包括具体的EMF记录的详细信息，微软已经分别出版的完整规范截至2006年：
Although the MSDN documentation for EMF playback doesn't include details of specific EMF records, Microsoft has separately published the complete specification as of 2006:
此外，我联系到上述本书的作者已经提供下载CDROM样本的源代码：
Also the author of the book I linked to above has made the source code of the CDROM samples available to download:
的的源代码
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