how to call common dialog using win dll

[sajisurendran]

please help me to dlls to call fileopen,filesave,filesaveas dialog
boxes

its giving an error stating user defined datatype not found

[Vlatko]

If you need to do it with API then:

' This code is licensed according to the terms and conditions listed here.

' Declarations and such needed for the example:
' (Copy them to the (declarations) section of a module.)
Public Type OPENFILENAME
	lStructSize As Long
	hwndOwner As Long
	hInstance As Long
	lpstrFilter As String
	lpstrCustomFilter As String
	nMaxCustomFilter As Long
	nFilterIndex As Long
	lpstrFile As String
	nMaxFile As Long
	lpstrFileTitle As String
	nMaxFileTitle As Long
	lpstrInitialDir As String
	lpstrTitle As String
	flags As Long
	nFileOffset As Integer
	nFileExtension As Integer
	lpstrDefExt As String
	lCustData As Long
	lpfnHook As Long
	lpTemplateName As String
End Type
Public Const OFN_FILEMUSTEXIST = &H1000
Public Const OFN_HIDEREADONLY = &H4
Public Const OFN_PATHMUSTEXIST = &H800
Public Declare Function GetOpenFileName Lib "comdlg32.dll" Alias "GetOpenFileNameA" (lpofn _
	As OPENFILENAME) As Long

' *** Place the following code inside a form window.

Private Sub Command1_Click()
	Dim filebox As OPENFILENAME  ' open file dialog structure
	Dim fname As String          ' filename the user selected
	Dim result As Long           ' result of opening the dialog
	
	' Configure how the dialog box will look
	With filebox
		' Size of the structure.
		.lStructSize = Len(filebox)
		' Handle to window opening the dialog.
       		.hwndOwner = Me.hWnd
		' Handle to calling instance (not needed).
		.hInstance = 0
		' File filters to make available: Text Files and All Files
		.lpstrFilter = "Text Files (*.txt)" & vbNullChar & "*.txt" & vbNullChar & _
			"All Files (*.*)" & vbNullChar & "*.*" & vbNullChar & vbNullChar
		'.lpstrCustomFilter is ignored -- unused string
		.nMaxCustomFilter = 0
		' Default filter is the first one (Text Files, in this case).
		.nFilterIndex = 1
		' No default filename.  Also make room for received
		' path and filename of the user's selection.
		.lpstrFile = Space(256) & vbNullChar
		.nMaxFile = Len(.lpstrFile)
		' Make room for filename of the user's selection.
		.lpstrFileTitle = Space(256) & vbNullChar
		.nMaxFileTitle = Len(.lpstrFileTitle)
		' Initial directory is C:\.
		.lpstrInitialDir = "C:\" & vbNullChar
		' Title of file dialog.
		.lpstrTitle = "Select a File" & vbNullChar
		' The path and file must exist; hide the read-only box.
		.flags = OFN_PATHMUSTEXIST Or OFN_FILEMUSTEXIST Or OFN_HIDEREADONLY
		' The rest of the options aren't needed.
		.nFileOffset = 0
		.nFileExtension = 0
		'.lpstrDefExt is ignored -- unused string
		.lCustData = 0
		.lpfnHook = 0
		'.lpTemplateName is ignored -- unused string
	End With
	
	' Display the dialog box.
	result = GetOpenFileName(filebox)
	If result <> 0 Then 
		' Remove null space from the file name.
		fname = Left(filebox.lpstrFile, InStr(filebox.lpstrFile, vbNullChar) - 1)
		Debug.Print "The selected file: "; fname
	End If
End Sub

[Vlatko]

OPENFILENAME info

lStructSize
The size in bytes of the structure. 
hwndOwner
A handle to the window opening the file dialog box. 
hInstance
If using a dialog box template, this is a handle to the memory block of the dialog box template to use. If using the default dialog box, set to 0. 
lpstrFilter
The entries in the File Type drop box. The format of the string is "name of file type" & vbNullChar & "mask" & vbNullChar ... for as many types, where name of file type is the text that appears in the list and mask is the extension mask. The string must end with a double vbNullChar. 
lpstrCustomFilter
Similar to lpstrFilter, but holds only one file type name/mask pair that specifies a user-defined file type. If unused, set to an empty string. 
nMaxCustFilter
The size in bytes of the string contained in lpstrCustomFilter. 
nFilterIndex
The number (#1, #2, etc.) of data type specified lpstrFilter should be the default one. 
lpstrFile
Set it as a series of blank spaces. If you want to specify a default filename, set this string to that default filename and pad it with spaces. Receives the complete path and filename of the file(s) the user selects. If multiple files are selected, each filename is separated by vbNullChar, and the entire string will end with a double vbNullChar. 
nMaxFile
The length in characters of lpstrFile. 
lpstrFileTitle
Very similar to lpstrFile, but only receives the filename of the selected file. If multiple files are selected, this is not set to any useful data. 
nMaxFileTitle
The length in characters of lpstrFileTitle. 
lpstrInitialDir
The default directory to look in. 
lpstTitle
The text that appears in the dialog box's title bar. 
flags
Zero or more of the following flags specifying how to create the file dialog box. Some of these flags will be set by the function after the call to reflect the user's selections. 
OFN_ALLOWMULTISELECT
Allow the user to select multiple files (Open File dialog box only). 
OFN_CREATEPROMPT
Prompt if a non-existing file is chosen. 
OFN_ENABLEHOOK
Use the function specified by lpfnHook to process the dialog box's messages. 
OFN_ENABLESIZING
Windows 98, 2000: Allow the dialog box to be resized. This is selected by default unless a hook function or custom template is specified. 
OFN_ENABLETEMPLATE
Use the dialog box template specifed by hInstance and lpTemplateName. 
OFN_ENABLETEMPLATEHANDLE
Use the preloaded dialog box template specified by hInstance. 
OFN_EXPLORER
Use Windows Explorer-like additions to the file dialog box. This is selected by default unless a hook function or custom template is specified. 
OFN_EXTENSIONDIFFERENT
The function sets this flag if the user selects a file with an extension different than the one specified by lpstrDefExt. 
OFN_FILEMUSTEXIST
Only allow the selection of existing files. 
OFN_HIDEREADONLY
Hide the Open As Read Only check box (Open File dialog box only). 
OFN_LONGNAMES
Have the file dialog use long file names. This is automatically specified unless the Explorer-type extensions are not used. 
OFN_NOCHANGEDIR
Don't change Windows's current directory to match the one chosen in the dialog box. 
OFN_NODEREFERENCELINKS
If a shortcut file (.lnk or .pif) is chosen, return the shortcut file itself instead of the file or directory it points to. 
OFN_NOLONGNAMES
Have the file dialog use short (8.3) file names. This is ignored unless a file dialog without Explorer-type extensions are not used. 
OFN_NONETWORKBUTTON
Hide and disable the Network button in the dialog box. 
OFN_NOREADONLYRETURN
The function sets this flag if the selected file is not read-only (Open File dialog box only). 
OFN_NOTESTFILECREATE
Do not create a test file before the box closes. Normally, this check is done to verify that the disk exists, that there is sufficient disk space, etc. However, this check should not be used on a create-nonmodify network share. Specifying this flag prevents this test from being done. 
OFN_NOVALIDATE
Don't check the filename for invalid characters. 
OFN_OVERWRITEPROMPT
Prompt the user if the chosen file already exists (Save File dialog box only). 
OFN_PATHMUSTEXIST
Only allow the selection of existing paths. 
OFN_READONLY
Check the Open As Read Only box. This flag is set after the function call if the box is checked after the user clicks OK. 
OFN_SHAREAWARE
Ignore any file sharing violations. 
OFN_SHOWHELP
Show the Help button in the dialog box. The button sends the WM_HELP message to the hook function specified by the structure. If no hook function is used, the Help button will do nothing. 
nFileOffet
Receives the zero-based index specifying where in lpstrFile the pathname ends and the filename begins. 
nFileExtension
Receives the zero-based index specifying where in lpstrFile the file extension begins. 
lpstrDefExt
The default extension of a file (only for the Save dialog box). If a file is chosen with the *.* mask, the file gets this extension. Don't include the period. 
lCustData
Information to pass to the hook function specified by lpfnHook whenever it is called. 
lpfnHook
A pointer to a hook function to use to processes the dialog box's messages. For file dialogs with Explorer-type extensions, this is a pointer to a OFNHookProc hook function. For file dialogs without those extensions, this is a pointer to a OFNHookProcOldStyle hook function. If not using a hook function, set to 0. 
lpTemplateName
The name of the dialog box template specified by hInstance, if needed. 
Constant Definitions

Const OFN_ALLOWMULTISELECT = &H200
Const OFN_CREATEPROMPT = &H2000
Const OFN_ENABLEHOOK = &H20
Const OFN_ENABLESIZING = &H800000
Const OFN_ENABLETEMPLATE = &H40
Const OFN_ENABLETEMPLATEHANDLE = &H80
Const OFN_EXPLORER = &H80000
Const OFN_EXTENSIONDIFFERENT = &H400
Const OFN_FILEMUSTEXIST = &H1000
Const OFN_HIDEREADONLY = &H4
Const OFN_LONGNAMES = &H200000
Const OFN_NOCHANGEDIR = &H8
Const OFN_NODEREFERENCELINKS = &H100000
Const OFN_NOLONGNAMES = &H40000
Const OFN_NONETWORKBUTTON = &H20000
Const OFN_NOREADONLYRETURN = &H8000
Const OFN_NOTESTFILECREATE = &H10000
Const OFN_NOVALIDATE = &H100
Const OFN_OVERWRITEPROMPT = &H2
Const OFN_PATHMUSTEXIST = &H800
Const OFN_READONLY = &H1
Const OFN_SHAREAWARE = &H4000
Const OFN_SHOWHELP = &H10

[Nucleus]

see here:
http://www.vbforums.com/showthread.p...threadid=74418