请问

[kane]

class CActiveDesktop {

protected:

// ATL smart pointers are the only way to go!!

CComQIPtr<IActiveDesktop> m_pIActiveDesktop;



public:

HRESULT m_hr; // most recent return code



// ctor: create IActiveDesktop interface instance

//

CActiveDesktop() {

m_hr = m_pIActiveDesktop.CoCreateInstance(CLSID_ActiveDesktop,

NULL, CLSCTX_INPROC_SERVER);

// If this bombs, you probably forgot to call call CoInitialize

ASSERT(SUCCEEDED(m_hr));

}
已经include了shlobj.h
编译仍说IActiveDesktop没有定义

[kane]

每人知道吗

[kane]

谁会，再加100分

[wujpbb7]

#include "objbase.h"
#include "wininet.h"
#include "shlobj.h"

//#import "shell32.dll"
int main(int argc, char* argv[])
{

HRESULT hr;
IActiveDesktop *pActiveDesktop;

CoInitialize(NULL);
//Create an instance of the Active Desktop
hr = CoCreateInstance(CLSID_ActiveDesktop, NULL, CLSCTX_INPROC_SERVER,
IID_IActiveDesktop, (void**)&pActiveDesktop);

//Insert code to call the IActiveDesktop methods
USHORT sWallpaper[256];
pActiveDesktop->GetWallpaper(sWallpaper, 256, 0);


// Call the Release method
pActiveDesktop->Release();
CoUninitialize();
return 0;
}

编译可以通过，把它移到 MFC 工程中就不行了，真是奇怪！

参见 http://www.experts-exchange.com/CXO/Programming/Programming_Languages/Cplusplus/Q_10281184.html

[kane]

微软的msdn有这么个例子
HRESULT hr;
IActiveDesktop *pActiveDesktop;

//Create an instance of the Active Desktop
hr = CoCreateInstance(CLSID_ActiveDesktop, NULL, CLSCTX_INPROC_SERVER,
IID_IActiveDesktop, (void**)&pActiveDesktop);

//Insert code to call the IActiveDesktop methods

// Call the Release method
pActiveDesktop->Release();

我在编译时说没有定义IActiveDesktop,应该怎么做？

[wujpbb7]

#import "shell32.dll"

[kane]

还是不行，没人知道吗？

[kane]

blueblood7老兄说的问题确实存在，好奇怪

[kane]

还有个问题，就是通过程序改变动态桌面的wallpaper，
#include "objbase.h"
#include "wininet.h"
#include "shlobj.h"
#include "windows.h"
#include "TCHAR.h"
#include "atlconv.h"
#define UNICODE

int main(int argc, char* argv[])
{

HRESULT hr;
IActiveDesktop *pActiveDesktop;

CoInitialize(NULL);
//Create an instance of the Active Desktop
hr = CoCreateInstance(CLSID_ActiveDesktop, NULL, CLSCTX_INPROC_SERVER,
IID_IActiveDesktop, (void**)&pActiveDesktop);

COMPONENTSOPT opt;
opt.dwSize = sizeof(opt);
opt.fActiveDesktop = opt.fEnableComponents = true;
hr = pActiveDesktop->SetDesktopItemOptions(&opt,0);
pActiveDesktop->ApplyChanges(AD_APPLY_REFRESH); // do it!

//Insert code to call the IActiveDesktop methods
USES_CONVERSION;
char path[] = "e:\\pic\\rpcp001.jpg";
LPWSTR sWallpaper = A2W(path);

// pActiveDesktop->GetWallpaper(sWallpaper, 256, 0);
hr = pActiveDesktop->SetWallpaper(sWallpaper, 0);
hr = pActiveDesktop->ApplyChanges(AD_APPLY_REFRESH);


// Call the Release method
pActiveDesktop->Release();
CoUninitialize();
return 0;
}

编译通过，每个函数执行都返回S_OK，也没问题，但桌面wallpaper确不改变？？？？

[kane]

解决了，把最后一个applychanges的参数改为AD_APPLY_ALL

在此，多谢 ukyoking(累) 老兄