怎样用程序激活Active Desktop?

Question

你是说类似那个“显示桌面”那个功能？
可不可以ENUM窗口。然后通过判断它的属性是否具有SHOW等。
从而给它发最小化消息来达到？

Answer 1

可以使用IActiveDesktop.
MSDN: IActiveDesktop Interface
Allows a client program to manage the desktop items and wallpaper on a local computer.这儿有个封装好的。
#pragma once#include <shlguid.h>
#include <shlobj.h> // IActiveDesktop
#include <atlbase.h> // ATL stuff//////////////////
// Handy class to manipulate the active desktop
//
class CActiveDesktop {
protected:
// ptr to IActiveDesktop interface
CComQIPtr<IActiveDesktop> m_pIActiveDesktop;public:
// ctor: get interface ptr to IActiveDesktop
CActiveDesktop() {
HRESULT hr = m_pIActiveDesktop.CoCreateInstance(CLSID_ActiveDesktop,
NULL, CLSCTX_INPROC_SERVER);
// If this bombs, you most likely forgot to call call CoInitialize
ASSERT(SUCCEEDED(hr));
} // Determine if Active Desktop is enabled. Could also use SHGetSettings
//
BOOL IsEnabled() {
ASSERT(m_pIActiveDesktop);
COMPONENTSOPT opt;
opt.dwSize = sizeof(opt);
HRESULT hr = m_pIActiveDesktop->GetDesktopItemOptions(&opt,0);
ASSERT(SUCCEEDED(hr));
return opt.fActiveDesktop;
}

// Enable/disable Active Desktop. Calls IActiveDesktop.
//
void Enable(BOOL bEnable) {
ASSERT(m_pIActiveDesktop);
COMPONENTSOPT opt;
opt.dwSize = sizeof(opt);
HRESULT hr = m_pIActiveDesktop->GetDesktopItemOptions(&opt,0);
ASSERT(SUCCEEDED(hr));
opt.fActiveDesktop = bEnable;
hr = m_pIActiveDesktop->SetDesktopItemOptions(&opt,0);
ASSERT(SUCCEEDED(hr));
ApplyChanges(AD_APPLY_REFRESH);
} // Apply the changes
//
void ApplyChanges(DWORD dwFlags) {
ASSERT(m_pIActiveDesktop);
HRESULT hr = m_pIActiveDesktop->ApplyChanges(dwFlags);
ASSERT(SUCCEEDED(hr));
};};这样用就行了。
void CMainFrame::OnActiveDesktop()
{
CActiveDesktop ad;
ad.Enable(!ad.IsEnabled());
}void CMainFrame::OnUpdateActiveDesktop(CCmdUI* pCmdUI)
{
CActiveDesktop ad;
pCmdUI->SetText(ad.IsEnabled() ? _T("Disable &Active Desktop")
: _T("Enable &Active Desktop"));
}