c++更改电脑桌面

网上很难找到一个完整的使用IActiveDesktop更改桌面图片的确实可行的例子，现笔者收集多方资料整理如下，该程序在VC6.0上运行OK。

Step1.

在需要使用IActiveDesktop程序所在的C++文档里包含头文件#include

Step2.

在StdAfx.h文件中增加#include

Note:可在VC的"FileView"标签页中的Header Files文件夹下双击打开StdAfx.h文件，或者进入该工程所在目录里打开StdAfx.h文件。

#define VC_EXTRALEAN // Exclude rarely-used stuff from Windows headers

#include // MFC core and standard components
#include //这里是增加的正确位置
#include // MFC extensions

#include // MFC Automation classes
#include // MFC support for Internet Explorer 4 Common Controls
#ifndef _AFX_NO_AFXCMN_SUPPORT
#include // MFC support for Windows Common Controls
//#include 有些资料说要加此头文件，但笔者在VC6.0下测试不需要
#endif // _AFX_NO_AFXCMN_SUPPORT

Step3.

下面是实际测试通过的函数例子(两个函数都测试通过)。

函数一：

//strPicFile是图像文件名,支持BMP JPEG GIF等格式
//dwStyle是墙纸的样式
//WPSTYLE_CENTER 居中 0
//WPSTYLE_TILE 平铺 1
//WPSTYLE_STRETCH 拉伸 2
//WPSTYLE_MAX 3
//返回值是TRUE时墙纸设置成功，返回FALSE时失败
bool CChgWpDlg::SetMyWallpaper(CString &strPicFile, DWORD dwStyle)
{
HRESULT hr;
IActiveDesktop* pIAD;
//Applications must initialize the COM library before they can call COM library functions
CoInitialize(NULL);
//创建接口的实例
hr = CoCreateInstance ( CLSID_ActiveDesktop, NULL, CLSCTX_INPROC_SERVER,
IID_IActiveDesktop, (void**) &pIAD );
if(!SUCCEEDED(hr)) return FALSE;
//将文件名改为宽字符串,这是IActiveDesktop::SetWallpaper的要求
WCHAR wszWallpaper [MAX_PATH];
LPTSTR lpStr = strPicFile.GetBuffer(strPicFile.GetLength() );
MultiByteToWideChar(CP_ACP, 0, lpStr, -1, wszWallpaper, MAX_PATH);
strPicFile.ReleaseBuffer();
//设置墙纸
hr = pIAD->SetWallpaper(wszWallpaper, 0);
if(!SUCCEEDED(hr)) return FALSE;
//设置墙纸的样式
WALLPAPEROPT wpo;
wpo.dwSize = sizeof(wpo);
wpo.dwStyle = dwStyle;
hr = pIAD->SetWallpaperOptions(&wpo, 0);
if(!SUCCEEDED(hr)) return FALSE;
//应用墙纸的设置
hr = pIAD->ApplyChanges(AD_APPLY_ALL);
if(!SUCCEEDED(hr)) return FALSE;
//读取墙纸的文件名并打印在debug窗口内
hr = pIAD->GetWallpaper(wszWallpaper, MAX_PATH, 0);
CString strFile = wszWallpaper;
TRACE(strFile); //如果不用位图的话,这里有你意想不到的发现
//释放接口的实例
pIAD->Release();
CoUninitialize();
return TRUE;
}

函数二：

bool CChgWpDlg::SetMyWallpaper(CString &strPicFile, DWORD dwStyle)
{
IActiveDesktop *pActiveDeskt

op;

HRESULT hr;
CoInitialize(NULL);

hr = CoCreateInstance(CLSID_ActiveDesktop, NULL, CLSCTX_INPROC_SERVER,
IID_IActiveDesktop, (void**)&pActiveDesktop);

COMPONENTSOPT comps;
comps.dwSize = sizeof comps;
comps.fEnableComponents = TRUE;
comps.fActiveDesktop = TRUE;

pActiveDesktop->SetDesktopItemOptions(&comps,0);
//下面是使用固定path的文件的方法
if (FAILED(pActiveDesktop->SetWallpaper(L"C:\\cy002.jpg",0)))
return false;

pActiveDesktop->ApplyChanges(AD_APPLY_ALL|AD_APPLY_FORCE);

pActiveDesktop->Release();
CoUninitialize();

return true;
}