太简单的问题了,都不好意思问,但是就搞不定.

[allen_zhaozhencn]

刚学COM, 太菜了,不要笑我...

我在一个SDI的InitInstance函数有如下代码:
IActiveDesktop *IAD = NULL;
HRESULT hr;
CString path;
hr = CoCreateInstance(CLSID_ActiveDesktop,
NULL,
CLSCTX_INPROC_SERVER,
IID_IActiveDesktop,
(void**)&IAD
);
if (SUCCEEDED(hr) )
{
IAD->GetWallpaper(path, NULL, 0);
MessageBox(NULL, path, path, MB_OK);
IAD->Release( );
}

在stdafx.h中,加入了
#include""shlobj.h"
#include "COMDEF.H"

编译时老是出现:
C:\Documents and Settings\Administrator.ABC\桌面\com\com.cpp(96) : error C2027: use of undefined type 'IActiveDesktop'
c:\program files\microsoft visual studio\vc98\include\comdef.h(507) : see declaration of 'IActiveDesktop'
C:\Documents and Settings\Administrator.ABC\桌面\com\com.cpp(96) : error C2227: left of '->GetWallpaper' must point to class/struct/union
C:\Documents and Settings\Administrator.ABC\桌面\com\com.cpp(98) : error C2027: use of undefined type 'IActiveDesktop'
c:\program files\microsoft visual studio\vc98\include\comdef.h(507) : see declaration of 'IActiveDesktop'
C:\Documents and Settings\Administrator.ABC\桌面\com\com.cpp(98) : error C2227: left of '->Release' must point to class/struct/union

[allen_zhaozhencn]

调用系统的COM,要包括那些头文件,还要作一些什么设置?

[KyoUs]

那敢笑啊..........

帮你up

[allen_zhaozhencn]

谢楼上兄弟.

[xenke]

你查你调用的函数在那个头文件中不就行了,一般包括OAIDL.H,OCIDL.H等,

[eastsun]

缺乏必要的头文件，比如用tlh或者用import 某个DLL。

VC与VB不一样，一定需要函数的声明才可以使用（声明一般放在头文件中）。否则编译都无法通过。

[XiangDong]

shlobj.h

[allen_zhaozhencn]

我已经包含了头文件: #include"shlobj.h". 一样不能通过编译.怪就在这.