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- D&DSERVE.DLL
- DLL to Support Win 3.1 Drag 'n Drop Server Capability
- by Jonathan Zuck
- Published in the August 1992 Windows Tech Journal
- This file contains the description for use by VB programmers
-
- Function Summaries:
- DropSelItems Drops the selected files in a multi-select List Box
- DropAllItems Drops all the files in a list box
- DropBuff Drops files contained in a passed buffer
-
-
- Function Declarations:
- Declare Function DropSelItems Lib "D&DSERVE.DLL" (ByVal hList, ByVal Path$, ByVal nButton)
- Declare Function DropAllItems Lib "D&DSERVE.DLL" (ByVal hList, ByVal nButton)
- Declare Function DropBuff Lib "D&DSERVE.DLL" (ByVal Buff$, ByVal nButton)
-
-
- Function Details:
-
- DropSelItems: (D&DTEST1.MAK)
- You must have a multi-select list box to use this function. Most of
- you will be using those list boxes available from third parties such as
- Crescent, MicroHelp and Sheridan. However, to make the demo more generalized,
- I modified Costas' MultiPik demo to accomodate the needs of a file list.
- Unfortunately, this means that it's a little more complicated than it needs
- to be. The real demo code for this function would look something like this:
-
- Sub MyFileList_MouseDown (Button As Integer, X As Single, Y as Single)
- Path$ = Dir1.Path + "\"
- hTarget = DropSelItems (MyFileList.hWnd, Path$, Button)
- End Sub
-
- where hTarget will be the hWnd of the Window on which the selected files
- were dropped or Zero if the mouse was not released over a valid window.
- One caveat is that the left mouse button will generally remove the
- selections from an extended selection list box (the File manage does a
- ton of special processing). Therefore, you might want to specify for the
- user that the Right mouse button be used to drag from the list box.
-
-
- DropAllItems: (D&DTEST2.MAK)
- This function has two advantages. First, it does not require a
- multi-select list box so those of you without add-ons will be able to
- use it. Second, it is capabile of dealing with files from multiple
- directories which DropSelItems (or even FileManager) is not capable of.
- Keep in mind that since you do not pass the path to this funtion, each
- file name in the list must be fully qualified. When used, this function
- will drop all of the items in the list on the target window.
-
- DropBuff: (D&DTEST3.MAK)
- This function is provided primarily for those programming systems
- that are not able to use a standard list box or have special needs. In
- this case, you are essentially constructing the buffer that will be sent
- to the target window. The format of this buffer is a fully qualified
- filename, followed by a null, followed by another filename+NULL, etc., and
- finally terminated by another null.
- Visual Basic will add the terminating null so you don't need to
- worry about the second one. You just need to construct a strong like so:
-
- N$ = Chr$(0)
- Buff$ = "C:\AUTOEXEC.BAT" + N$ + "C:\DOS\README.TXT" + N$
-
- and then pass it ByVal to the function. I dont't generally recommend this
- function as it is the least intuitive to the user but it might be helpful
- under special circumstances.
-
- Testing your Code:
- I have found WRITE to be the best place to test these functions
- as it is one of the only WINAPPs that supports the dropping of multiple
- files (into the client area, *not* on the icon!).
-
- Source Code:
- The TPW source code for D&DSERVE is available in Lib 9 of CLMFORUM
- and was first published in the August 1992 issue of the Windows Tech
- Journal. For explanations of how these functions work, please contact
- Oakley Publishing for back issues.
-
- For more information or subscriptions to the Windows Tech Journal,
- call (800) 234 - 0386 or outside of the US, (503) 747 - 0800. The fax number
- is (503) 747 - 0071. Alternatively, you may reach the editor, J.D. Hildebrand
- (until he becomes too popular) here on CIS at id: 76701,32. The journal
- can be reached by mail at:
-
- Windows Tech Journal
- P.O. Box 70167
- Eugene, OR 97401-0110
-
- Thanks a lot for your interest! -=- Jonathan
-
-
- ---------------------end of author's documentation-------------------
-
- This program is distributed by Public (software) Library.
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-
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