第C++程序操作文件對話框的方法strLog.Format(_T("[CanAccessFile]GetFileSecurity-dwSize:%d"),dwSize);

WriteLog(strLog);

//獲取文件權(quán)限信息結(jié)構(gòu)體大小

bRet=GetFileSecurity(strPath,si,psd,dwSize,dwSize);

if(!bRet)

strLog.Format(_T("[CanAccessFile]GetFileSecurity-dwSizefailed,GetLastError:%d"),GetLastError());

WriteLog(strLog);

delete[]pBuf;

returnFALSE;

WriteLog(_T("[CanAccessFile]OpenProcessToken"));

HANDLEhToken=NULL;

if(!OpenProcessToken(GetCurrentProcess(),TOKEN_ALL_ACCESS,hToken))

strLog.Format(_T("[CanAccessFile]OpenProcessTokenfailed,GetLastError:%d"),GetLastError());

WriteLog(strLog);

delete[]pBuf;

returnFALSE;

WriteLog(_T("[CanAccessFile]DuplicateToken"));

//模擬令牌

HANDLEhImpersonatedToken=NULL;

if(!DuplicateToken(hToken,SecurityImpersonation,hImpersonatedToken))

strLog.Format(_T("[CanAccessFile]DuplicateTokenfailed,GetLastError:%d"),GetLastError());

WriteLog(strLog);

delete[]pBuf;

CloseHandle(hToken);

returnFALSE;

WriteLog(_T("[CanAccessFile]MapGenericMask"));

//在檢測是否有某個(gè)權(quán)限時(shí)，將GENERIC_WRITE等值傳給本函數(shù)的第二個(gè)參數(shù)dwGenericAccessMask

//GENERIC_WRITE等參數(shù)在調(diào)用CreateFile創(chuàng)建文件時(shí)會使用到，下面調(diào)用MapGenericMask將

//GENERIC_WRITE等轉(zhuǎn)換成FILE_GENERIC_WRITE等

//將GENERIC_XXXXXX轉(zhuǎn)換成FILE_GENERIC_XXXXXX

GENERIC_MAPPINGgenMap;

genMap.GenericRead=FILE_GENERIC_READ;

genMap.GenericWrite=FILE_GENERIC_WRITE;

genMap.GenericExecute=FILE_GENERIC_EXECUTE;

genMap.GenericAll=FILE_ALL_ACCESS;

MapGenericMask(dwGenericAccessMask,genMap);

WriteLog(_T("[CanAccessFile]AccessCheck"));

//調(diào)用AccessCheck來檢測是否有指定的權(quán)限

PRIVILEGE_SETprivileges={0};

DWORDdwGrantedAccess=0;

DWORDprivLength=sizeof(privileges);

BOOLbGrantedAccess=FALSE;

if(AccessCheck(psd,hImpersonatedToken,dwGenericAccessMask,

genMap,privileges,privLength,dwGrantedAccess,bGrantedAccess))

strLog.Format(_T("[CanAccessFile]AccessChecksucceed,dwGenericAccessMask:%d,dwGrantedAccess:%d,bGrantedAccess:%d,"),

dwGenericAccessMask,dwGrantedAccess,bGrantedAccess);

WriteLog(strLog);

if(bGrantedAccess)

if(dwGenericAccessMask==dwGrantedAccess)

bGrantedAccess=TRUE;

else

bGrantedAccess=FALSE;

else

bGrantedAccess=FALSE;

else

strLog.Format(_T("[CanAccessFile]AccessCheckfailed,GetLastError:%d"),GetLastError());

WriteLog(strLog);

bGrantedAccess=FALSE;

strLog.Format(_T("[CanAccessFile]bGrantedAccess:%d"),bGrantedAccess);

WriteLog(strLog);

delete[]pBuf;

CloseHandle(hImpersonatedToken);

CloseHandle(hToken);

returnbGrantedAccess;

}

另外，我們可以在HOOK回調(diào)函數(shù)中調(diào)整文件對話框相對于父窗口的彈出位置，攔截WM_INITDIALOG消息，代碼如下：

//通過該回調(diào)函數(shù)移動文件保存對話框的位置，解決win32文件對話框默認(rèn)顯示在屏幕左上方的問題

UINT_PTRCALLBACKOFNHookProc(

HWNDhdlg,//handletochilddialogbox

UINTuiMsg,//messageidentifier

WPARAMwParam,//messageparameter

LPARAMlParam//messageparameter

if(uiMsg==WM_INITDIALOG)

HWNDhFileDlg=::GetParent(hdlg);

HWNDhParent=::GetParent(hFileDlg);

RECTrcParent;

::GetWindowRect(hParent,rcParent);

RECTrcFileDlg;

::GetWindowRect(hFileDlg,rcFileDlg);

intnFileDlgWdith=rcFileDlg.right-rcFileDlg.left;

intnFileDlgHeight=rcFileDlg.bottom-rcFileDlg.top;

RECTrcDst;

rcDst.left=rcParent.left+((rcParent.right-rcParent.left)-nFileDlgWdith)/2;

rcDst.right=rcDst.left+nFileDlgWdith;

rcDst.bottom=rcParent.bottom+1;

rcDst.top=rcDst.bottom-nFileDlgHeight;

//下面保證文件對話框處于屏幕可視區(qū)域內(nèi)

if(rcDst.left0)

rcDst.left=0;

rcDst.right=rcDst.left+nFileDlgWdith;

if(rcDst.top0)

rcDst.top=0;

rcDst.bottom=rcDst.top+nFileDlgHeight;

intnXScreen=::GetSystemMetrics(SM_CXSCREEN);

intnYScreen=::GetSystemMetrics(SM_CYSCREEN);

if(rcDst.rightnXScreen)

rcDst.right=nXScreen;

rcDst.left=rcDst.right-nFileDlgWdith;

if(rcDst.bottomnYScreen)

rcDst.bottom=nYScreen;

rcDst.top=rcDst.bottom-nFileDlgHeight;

//重新設(shè)置文件對話框位置

::SetWindowPos(hFileDlg,NULL,rcDst.left,rcDst.top,0,0,SWP_NOSIZE|SWP_NOZORDER);

return1;

return0;

}

3、調(diào)用SHBrowseForFolder接口打開瀏覽文件夾對話框

當(dāng)我們在IM聊天框中發(fā)起文件傳輸時(shí)，我們要發(fā)送的是一個(gè)文件夾，可能就需要使用到系統(tǒng)的瀏覽文件夾對話框來選擇要發(fā)送的文件夾。當(dāng)我們在接收到多個(gè)文件時(shí)，可以選擇全部另存為，此時(shí)也需要使用系統(tǒng)的瀏覽文件夾對話框來選擇要另存為的路徑。

我們調(diào)用SHBrowseForFolder接口即可打開瀏覽文件夾對話框，相關(guān)代碼如下所示：

//打開目錄選擇對話框

::CoInitialize(NULL);

LPMALLOClpMalloc=NULL;

TCHARpchSelDir[MAX_PATH]={0};

pchSelDir[0]=_T('\0');

if(E_FAIL==::SHGetMalloc(lpMalloc))

::CoUninitialize();

return;

BROWSEINFObrowseInfo;

browseInfo.hwndOwner=m_hParentWnd;

browseInfo.pidlRoot=NULL;

browseInfo.pszDisplayName=NULL;

browseInfo.lpszTitle=STRING_SEL_FOLDER_TO_SEND;

browseInfo.ulFlags=BIF_RETURNONLYFSDIRS;

browseInfo.lpfn=NULL;

browseInfo.lParam=0;

//打開瀏覽文件夾對話框

LPITEMIDLISTlpItemIDList=NULL;

if((lpItemIDList=::SHBrowseForFolder(browseInfo))