CFileDialog

CFileDialog[编辑本段]CFileDialog文件选择对话框的使用：首先构造一个对象并提供相应的参数，构造函数原型如下：CFileDialog::CFileDialog( BOOL bOpenFileDialog, LPCTSTR lpszDef Ext = NULL, LPCTSTR lpszFileName = NULL, DWORD dwFlags = OF N_HIDEREADONLY | OFN_OVERW RITEPROMPT, LPCTSTR lpszFilter = NULL, CW nd* pParentW nd = NULL );参数意义如下：bOpenFileDialog 为TRUE则显示打开对话框，为FALSE则显示保存对话文件对话框。

lpszDefExt 指定默认的文件扩展名。

lpszFileName 指定默认的文件名。

dwFlags 指明一些特定风格。

lpszFilter 是最重要的一个参数，它指明可供选择的文件类型和相应的扩展名。

参数格式如："Chart Files (*.xlc)|*.xlc|W orksheet Files (*.xls)|*.xls|Data Files (*.xlc; *.xls)|*.xlc; *.xls|All Files (*.*)|*.*||";文件类型说明和扩展名间用| 分隔，同种类型文件的扩展名间可以用; 分割，每种文件类型间用| 分隔，末尾用||指明。

pParentW nd 为父窗口指针。

创建文件对话框可以使用DoModal()，在返回后可以利用下面的函数得到用户选择：CString CFileDialog::GetPathName( ) 得到完整的文件名，包括目录名和扩展名如：c: est est1.txtCString CFileDialog::GetFileName( ) 得到完整的文件名，包括扩展名如：test1.txtCString CFileDialog::GetExtName( ) 得到完整的文件扩展名，如：txt CString CFileDialog::GetFileTitle ( ) 得到完整的文件名，不包括目录名和扩展名如：test1POSITION CFileDialog::GetStartPosition( ) 对于选择了多个文件的情况得到第一个文件位置。

CString CFileDialog::GetNextPathName( POSITION& pos ) 对于选择了多个文件的情况得到下一个文件位置，并同时返回当前文件名。

但必须已经调用过POSITION CFileDialog::GetStartPosition( )来得到最初的POSITI ON变量。

例如{CStringFilePathName;CFileDialog dlg(TRUE);///TRUE为OPEN对话框，FALSE为SAVE AS 对话框if(dlg.DoModal()==IDOK)FilePathName=dlg.GetPathName();}相关信息：CFileDialog 用于取文件名的几个成员函数：假如选择的文件是C:W INDOW STEST.EXE则:(1)GetPathName();取文件名全称，包括完整路径。

取回C:W INDOWSTE ST.EXE(2)GetFileName();取文件全名：TEST.EXE(3)GetFileTitle();取回TEST(4)GetFileExt();取扩展名EXE补充: 在控制台下使用这个类需要设置在静态库中使用MFC,然后构造A fxSetResourceHandle(Get ModuleHandle(NULL));相关头文件#include <Afxdlgs.h>例:int main(){AfxSetResourceHandle(GetModuleHandle(NULL));CFileDialog filedlg(TRUE);if(IDOK==filedlg.DoModal()){...}return 0;}附dwFlagsFlagsA set of bit flags you can use to initialize the dialog box. W hen t he dialog box returns, it sets these flags to indic ate the user's input. This member can be a combination of the following flags.OFN_ALLOW MULT ISELECTSpecifies that the File Name list box allows multiple selections. If you also set the OFN_EXPLORER flag, the dialog box uses the Expl orer-style user interface; otherwise, it uses the old-style user interface.If the user selects more than one file, the lpstrFile buffer returns the path to the current directory followed by the file names of the sel ected files. The nFileOffset member is the offset, in byt es or characte rs, to the first file name, and the nFileExtension member is not used. For Explorer-style dialog boxes, the directory and file name strings a re NULL separated, with an extra NULL character after the last file n ame. This format enables the Explorer-style dialog boxes to return lon g file names that include spaces. For old-style dialog boxes, the direc tory and file name strings are separated by spaces and the function u ses short file names for file names with spaces. You can use the Fin dFirstFile function to convert between long and short file names.If you specify a custom template for an old-style dialog box, the definition of the File Name list box must contain the LBS_EXTENDED SEL value.OFN_CREATEPROMPTIf the user specifies a file that does not exist, this flag causes th e dialog box to prompt the user for permission to create the file. If th e user chooses to create the file, the dialog box closes and the funct ion returns the specified name; otherwise, the dialog box remains ope n. If you use this flag with the OFN_ALLOW MULTISELECT flag, the d ialog box allows the user to specify only one nonexistent file.OFN_DONTADDTORECENTW indows 2000/XP: Prevents the system from adding a link to the selected file in the file system directory that co ntains the user's mostrecently used documents. To retrieve the location of this directory, c all the SHGetSpecialFolderLocation function with the CSIDL_RECENT f lag.OFN_ENABLEHOOKEnables the hook function specified in the lpfnHook member.OFN_ENABLEINCLUDENOTIF YW indows 2000/XP: Causes the dialog box to send CDN_INCLUDEI TEM notification messages to your OFNHookProc hook procedure whe n the user opens a folder. The dialog box sends a notification for ea ch item in the newly opened folder. These messages enable you to c ontrol which items the dialog box displays in the folder's item list.OFN_ENABLESIZINGW indows 2000/XP, W indows 98/Me: Enables the Explorer-style dial og box to be resized using either the mouse or the keyboard. By def ault, the Explorer-style Open and Save As dialog boxes allow the dial og box to be resized regardless of whether this flag is set. This flag is necessary only if you provide a hook procedure or custom template. The old-style dialog box does not permit resizing.OFN_ENABLETE MPLATEIndicates that the lpTemplateName member is a pointer to the na me of a dialog template resource in the module identified by the hInst ance member. If the OFN_EXPLORER flag is set, the system uses th e specified template to create a dialog box that is a child of the defa ult Explorer-style dialog box. If the OFN_EXPLORER flag is not set, t he system uses the template to create an old-style dialog box that re places the default dialog box.OFN_ENABLETE MPLATEHANDLEIndicates that the hInstance member identifies a data block that c ontains a preloaded dialog box template. The system ignores lpTempla teName if this flag is specified. If the OFN_EXPLORER flag is set, th e system uses the specified template to create a dialog box that is a child of the default Explorer-style dialog box. If the OFN_EXPLORER flag is not set, the system uses the template to create an old-style dialog box that replaces the default dialog box.OFN_EXPLORERIndicates that any customizations made to the Open or Save As dialog box use the new Explorer-style customization methods. For mor e information, see Explorer-Style Hook Procedures and Explorer-Style Custom Templates.By default, the Open and Save As dialog boxes use the Explorer-style user interface regardless of whether this flag is set. This flag is necessary only if you provide a hook procedure or custom template, or set the OFN_ALLOW MULT ISELECT flag.If you want the old-style user interface, omit the OFN_EXPLORER flag and provide a replacement old-style template or hook procedure. If you want the old style but do not need a custom template or hoo k procedure, simply provide a hook procedure that always returns FAL SE.OFN_EXTENSIOND IFFERENTSpecifies that the user typed a file name extension that differs fro m the extension specified by lpstrDefExt. The function does not use t his flag if lpstrDefExt is NULL.OFN_FILE MUSTE XISTSpecifies that the user can type only names of existing files in th e File Name entry field. If this flag is specified and the user enters a n invalid name, the dialog box procedure displays a warning in a mes sage box. If this flag is specified, the OFN_PATHMUSTEXIST flag is also used. This flag can be used in an Open dialog box. It cannot be used with a Save As dialog box.OFN_FORCESHOW HIDDENW indows 2000/XP: Forces the showing of system and hidden files, thus overriding the user setting to show or not show hidden files. Ho wever, a file that is marked both system and hidden is not shown.OFN_HIDEREADONLYHides the Read Only check box.OFN_LONGNAMESFor old-style dialog boxes, this flag causes the dialog box to use long file names. If this flag is not specified, or if the OFN_ALL OW MULTISELECT flag is also set, old-style dialog boxes use short file na mes (8.3 format) for file names with spaces. Explorer-style dialog box es ignore this flag and always display long file names.OFN_NOCHANGEDIRRestores the current directory to its original value if the user cha nged the directory while searching for files.W indows NT 4.0/2000/XP: This flag is ineffective for GetOpenFile Name.OFN_NODEREFERENCELINKSDirects the dialog box to return the path and file name of the sel ected shortcut (.LNK) file. If this value is not specified, the dialog box returns the path and file name of the file referenced by the shortcut.OFN_NOLONGNAMESFor old-style dialog boxes, this flag causes the dialog box to use short file names (8.3 format). Explorer-style dialog boxes ignore this flag and always display long file names.OFN_NONETW ORKBUTTONHides and disables the Network button.OFN_NOREADONLYRETURNSpecifies that the returned file does not have the Read Only chec k box selected and is not in a write-protected directory.OFN_NOTESTFILECREATESpecifies that the file is not created before the dialog box is clos ed. This flag should be specified if the application saves the file on a create-nonmodify network share. W hen an application specifies this fl ag, the library does not check for write protection, a full disk, an ope n drive door, or network protection. Applications using this flag must perform file operations carefully, because a file cannot be reopened o nce it is closed.OFN_NOVALID ATESpecifies that the common dialog boxes allow invalid characters in the returned file name. Typically, the calling application uses a hook procedure that checks the file name by using the FILEOKSTRING me ssage. If the text box in the edit control is empty or contains nothingbut spaces, the lists of files and directories are updated. If the text box in the edit control contains anything else, nFileOffset and nFileExt ension are set to values generated by parsing the text. No default ext ension is added to the text, nor is text copied to the buffer specified by lpstrFileTitle. If the value specified by nFileOffset is less than zero, the file name is invalid. Otherwise, the file name is valid, and nFileE xtension and nFileOffset can be used as if the OFN_NOVALIDATE fla g had not been specified.OFN_OVERW RITEPROMPTCauses the Save As dialog box to generate a message box if th e selected file already exists. The user must confirm whether to over write the file.OFN_PATHMUSTEXISTSpecifies that the user can type only valid paths and file names. If this flag is used and the user types an invalid path and file name i n the File Name entry field, the dialog box function displays a warnin g in a message box.OFN_READONLYCauses the Read Only check box to be selected initially when th e dialog box is created. This flag indicates the state of the Read Onl y check box when the dialog box is closed.OFN_SHAREAW ARESpecifies that if a call to the OpenFile function fails because of a network sharing violation, the error is ignored and the dialog box ret urns the selected file name. If this flag is not set, the dialog box noti fies your hook procedure when a network sharing violation occurs for the file name specified by the user. If you set the OFN_EXPLORER fl ag, the dialog box sends the CDN_SHAREVIOLATION message to the hook procedure. If you do not set OFN_EXPLORER, the dialog box sends the SHAREVISTRING registered message to the hook procedur e.OFN_SHOW HELPCauses the dialog box to display the Help button. The hwndOw ne r member must specify the window to receive the HELPMSGSTRING registered messages that the dialog box sends when the user clicks th e Help button. An Explorer-style dialog box sends a CDN_HELP notifi cation message to your hook procedure when the user clic ks the Help button.OFN_USESHELLITE MDo not use.。