CFileDialog Usage in MFC

Use CFileDialog to select a file, use File::fopen Open file error, using the relative address, and Wang debugging for half a day, how to track also did not find errors, so ...

CFileDialog the use of the File selection dialog: First construct an object and provide the corresponding parameters, the constructor prototype is as follows:

Cfiledialog::cfiledialog (BOOL bopenfiledialog, LPCTSTR lpszDefExt = null, LPCTSTR lpszFileName = null, DWORD dwFlags = of n_hidereadonly | Ofn_overwriteprompt, LPCTSTR lpszfilter = null, cwnd* pParentWnd = null), the parameter has the following meanings:

• Bopenfiledialog true to display the Open dialog box, or False to display the Save Dialog File dialog box.
• LPSZDEFEXT Specifies the default file name extension.
• LPSZFILENAME Specifies the default file name.
• DwFlags indicates some particular style.
• Lpszfilter is the most important parameter that indicates the type of file to choose from and the corresponding extension. Parameter formats such as:

  "Chart Files (*.XLC) |*.xlc| Worksheet Files (*.xls) |*.xls| Data Files (*.xlc;*.xls) |*.xlc; *.xls| All Files (*. *) |*.*| | "; File type description and extension between | Delimited, can be used between extensions of the same type of file; Split, between each file type | Delimited, End with | | Specified.

• pParentWnd is the parent window pointer.

The Create File dialog box can use DoModal (), which can be used to get the user's choice after returning:

• CString Cfiledialog::getpathname () Gets the full file name, including the directory name and extension such as: C:\test\test1.txt
• CString Cfiledialog::getfilename () Gets the full file name, including the extension such as: Test1.txt
• CString Cfiledialog::getextname () Gets the full file extension, such as: txt
• CString Cfiledialog::getfiletitle () Gets the full file name, excluding the directory name and extension such as: test1
• POSITION cfiledialog::getstartposition () Gets the first file location for cases where multiple files are selected.
• CString cfiledialog::getnextpathname (position& Pos) Gets the next file location for cases where multiple files are selected, and returns the current file name at the same time. However, you must have already called position cfiledialog::getstartposition () to get the initial position variable.

[Some caution]

Cases:

CFileDialog GetFile (true,null,null,ofn_filemustexist, "Microsoft Excel (*.xls) |*.xls| All Files (*. *) |*.* ");

CFileDialog GetFile (Open File dialog box (TRUE), extension (null), file name (null), style-file must exist (ofn_filemustexist), view file type-excel file, all files ( Microsoft Excel (*.xls) |*.xls| All Files (*. *) |*.*);

style of macro definition

#define OFN_READONLY 0x00000001

#define OFN_OVERWRITEPROMPT 0x00000002

#define OFN_HIDEREADONLY 0x00000004

#define OFN_NOCHANGEDIR 0x00000008

#define OFN_SHOWHELP 0x00000010

#define Ofn_enablehook 0x00000020

#define Ofn_enabletemplate 0x00000040

#define Ofn_enabletemplatehandle 0x00000080

#define Ofn_novalidate 0x00000100

#define OFN_ALLOWMULTISELECT 0x00000200

#define Ofn_extensiondifferent 0x00000400

#define Ofn_pathmustexist 0x00000800

#define Ofn_filemustexist 0x00001000

#define OFN_CREATEPROMPT 0x00002000

#define Ofn_shareaware 0x00004000

#define Ofn_noreadonlyreturn 0x00008000

#define Ofn_notestfilecreate 0x00010000

#define Ofn_nonetworkbutton 0x00020000

#define Ofn_nolongnames 0x00040000//force no long names for 4.x modules

#if (WINVER >= 0x0400)

#define Ofn_explorer 0x00080000//New Look Commdlg

#define Ofn_nodereferencelinks 0x00100000

#define Ofn_longnames 0x00200000//force long names for 3.x modules

#define OFN_ENABLEINCLUDENOTIFY 0x00400000//Send include message to callback

#define Ofn_enablesizing 0x00800000

#endif

#if (_win32_winnt >= 0x0500)

#define Ofn_dontaddtorecent 0x02000000

#define Ofn_forceshowhidden 0x10000000//Show all files including System and hidden files

#endif//(_win32_winnt >= 0x0500)

It should be noted that after using CFileDialog, the current path of the program is set to the path of the selected file;

So, if the program is useful to the IO access or database access and other local operations, you need to pay attention to your current path with a relative path is not the original program path, remember!

cstring GetFilePath ()
{  

CString M_filepath;

GetModuleFileName (null,m_ Filepath.getbuffersetlength (max_path+1), MAX_PATH);

M_filepath.releasebuffer ();

int m_iposindex;

M_iposindex = m_ Filepath.reversefind (' \ \ ');

M_filepath = M_filepath.left (M _iposindex);

return m_filepath;

}

CFileDialog Usage in MFC