创建本地信息文件夹(MTM Folder)

本文介绍了一个用于创建本地信息文件夹的C++函数，并详细解释了其工作原理及注意事项。

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以下代码展示了如何创建一个本地信息文件夹：

VOID CreatePrivateFolder(const TDesC& folderName, TMsvId& newFolderId, BOOL bIsVisible /*= TRUE*/) { CMsvEntry * entry = m_pSession->GetEntryL( KMsvMyFoldersEntryIdValue ); CleanupStack::PushL( entry ); CMsvEntrySelection * entries = entry->ChildrenWithTypeL(KUidMsvFolderEntry); CleanupStack::PopAndDestroy( entry ); TInt nCount = entries->Count(); BOOL found = FALSE; for ( TInt i=1; i < nCount; i++ ) { TMsvId entryID = entries->At( i ); entry = m_pSession->GetEntryL( entryID ); CleanupStack::PushL( entry ); TMsvEntry msvEntry = entry->Entry(); TPtrC descr = msvEntry.iDetails; if (descr.Compare(folderName)==0) { found = TRUE; newFolderId = entryID ; } CleanupStack::PopAndDestroy( entry ); } delete entries; // if no folder found create one if (!found) { CMsvEntry * rootEntry = NULL; //Get the entry (whatever is passed in) rootEntry = m_pSession->GetEntryL(KMsvMyFoldersEntryIdValue); CleanupStack::PushL(rootEntry); if (rootEntry) { TMsvEntry newServiceEntry; newServiceEntry.iDate.HomeTime(); newServiceEntry.iSize = 0; newServiceEntry.iType = KUidMsvFolderEntry; newServiceEntry.iMtm = KUidMsvLocalServiceMtm; newServiceEntry.iServiceId =KMsvLocalServiceIndexEntryId; newServiceEntry.iDetails.Set(folderName); newServiceEntry.iDescription.Set(KNullDesC); newServiceEntry.SetVisible(bIsVisible); rootEntry->CreateL(newServiceEntry); newFolderId = newServiceEntry.Id(); } CleanupStack::PopAndDestroy(); // rootEntry } }

代码来源于Nokia论坛，但在其基础上做了一定的改动。

其中"KMsvMyFoldersEntryIdValue"定义如下：

const TMsvId KMsvMyFoldersEntryIdValue = 0x1008;

另外，m_pSession的创建最好使用同步的方式，即：

m_pSession = CMsvSession::OpenSyncL(*this);

否则如果使用不当，在CMsvSession创建好前使用了CreatePrivateFolder，会出现Kern-exec 3的错误！！！