未解决的初学者外部... [英] Unresolved externals for a beginner...

问题描述

我是c ++的新手，所以请耐心等待。



我是构建一些使用包含头文件的d ++（dshow.h）但是在链接时我在IID上使用未解析的外部和我使用的CLSID。



我尝试过：



我可以通过查看包含的文件并创建我自己的guids.h文件来作弊，例如：

Hi,

I am new to c++ so please bear with me.

I am building some c++ that uses included headers (dshow.h) but when linking I get unresolved externals on IID and CLSID I use.

What I have tried:

I can cheat by looking into the included files and creating my own guids.h file eg:

extern "C"
{
	extern const IID IID_IDvdGraphBuilder =
	{ 0xFCC152B6, 0xF372, 0x11d0,
	{ 0x8E, 0x00, 0x00, 0xC0, 0x4F, 0xD7, 0xC0, 0x8B } };

	extern const CLSID CLSID_DvdGraphBuilder =
	{ 0xFCC152B7, 0xF372, 0x11d0,
	{ 0x8E, 0x00, 0x00, 0xC0, 0x4F, 0xD7, 0xC0, 0x8B } };
}

这样可行，但从长远来看这不好，我错过了什么？

This works but this is not good for the long term, what am I missing?

推荐答案

您正在开发一个不容易的COM项目。花一些时间从好的方面学习 COM教程。



定义这些值是正确的，但要确保它们是唯一的，因为它们是用于创建这些值的标识符类。



永远记住：如果发生错误，请查看第一个非空返回码（HRESULT）。



就像纸牌屋一样，很多东西都可能出错; - ）

You are working on a COM project which isnt easy at all. Take some time and learn from a good COM tutorials.

It is correct to define these values, but be sure that they are unique because the are the identifiers for creating instances of these classes.

Always remember: if errors occurs check the first non-null return code (HRESULT) for the reason.

Like a "House of cards" lots of things can go wrong ;-)

dshow.h来自 DirectShow [ ^ ]，它包含在Windows SDK中。

dshow.h is from DirectShow[^], which is included in the Windows SDK.

我解决了它添加：

I solved it adding:

#pragma comment(lib, "strmiids.lib")

我很惊讶lib文件没有包含在Microsoft文档中。



感谢所有回复的人。

I am surprised the lib file isn't included in the Microsoft documentation.

Thanks to all who replied.

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