MFC tenth day (Files & registry)

(Struggling to sink)

Before the content was eaten, too lazy to fill

MFC operations on files:

File Operation class Constructor: CFile (file name, shared access mode);

Common class Method: Write writes data; Read reads data; Seek moves pointer position, seektobegin pointer start point, seektoend pointer moves end, GetLength gets file length

File write: Get Object > class method writes write (content, length) > class method Close

File read: Get object > Get length > Construct buffer based on length +1, and last byte assignment 0> class method reads read (cache, length) > Close

　　file Dialog Class construction : CFileDialog (dialog box type selection (true-> Open Dialog;false-> Save dialog box), set default extension, set default initial name

dialog box settings, set filter, specify parent window), after five items have default values

Save As dialog box: Construct Class object CFileDialog Filedlg (FALSE) > Display dialog Box Fildlg.domodal ();

Open File dialog box: Construct Class object CFileDialog Filedlg (TRUE) > Show dialog Box Fildlg.domodal ();

dialog box configuration: Title: FileDlg.m_ofn.lpstrTitle = "my title";

Filter: FileDlg.m_ofn.lpstrFilter = "Text File (*.txt) \0*.txt\0all Files (*. *) \0*.*\0\0"; Format: text description \ \ \ \ \ \ \ Can repeat multiple groups \0\0 two to end

Default extension: fileDlg.m_ofn.lpstrDefExt = "txt";

Get full path: Filedlg.getpathname ()

Get file name: Filedlg.getfilename ()

Registry access:

Create key: None is set to start; RegCreateKey (select Table item handle (registry branch), table name, return handle to store);

Close key: RegCreateKey (); close handle

Open key: RegOpenKey (table item handle, table name, handle stored);

Write table: RegSetValue (table item handle, table name, table value type, table value, table value length); (recommended)

RegSetValueEx (table item handle, table name, 0, table value type, table value cache, table value length)

Read table: RegQueryValue (table item handle, table name, return value cache, return value length)

RegQueryValueEx ()

　　

MFC tenth day (Files & registry)