vc更改桌面背景.doc

更改桌面背景使用IactiveDesktop对象更改Windows 系统桌面背景。第一步在需要使用IActiveDesktop程序所在的C+文件中加入头文件#include第二步在StdAfx.h中插入#include 位置不能搞错,否则IActiveDesktop将找不到定义 #include /MFC core and standard components#include /正确位置#include /MFC extensions第三步创建基于对话框的VC程序yanggung,在对话框上添加按钮，添加按钮响应函数CFileDialog dlg(true,NULL,NULL,OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,_T(图片(*.bmp;*.jpg;*.jpeg)|*.bmp;*.jpg;*.jpeg|),this);dlg.m_ofn.lStructSize = 88;if(dlg.DoModal() = IDOK)CString str;str = dlg.GetPathName();if(SetWallpaper(str,2)AfxMessageBox(_T(更改桌面成功!);为程序添加成员函数SetWallpaperbool CYangguangDlg:SetWallpaper(CString &strPicFile, DWORD dwStyle)HRESULT hr; IActiveDesktop* pIAD; /创建接口的实例 CoInitialize(NULL); 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 wszWallpaperMAX_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; /释放接口的实例 pIAD- Release(); CoUninitialize(); return true;/strPicFile是图像文件名,支持BMP JPEG GIF等格式/dwStyle是墙纸的样