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Thread: [RESOLVED] Simulate drag and drop image from clipboard

  1. #1

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    Resolved [RESOLVED] Simulate drag and drop image from clipboard

    I'm trying to 'Drop' an image file at the current mouse location, FileType Image (BMP,JPG,PNG).

    i've written code to grab an image from the clipboard and save it. But now i want to grab this image and drop it at mousepos when a hotkey is pressed.

    The hotkey is working without my app having the focus ( as intended ) but now im stuck at actually dropping this file when the hotkey is pressed.

    My form:
    Code:
    Option Explicit
    
    Private Sub Command1_Click()
    
    Dim ImageName$
    
    Picture1.Picture = Clipboard.GetData
    Clipboard.Clear
    ImageName$ = InputBox("Provide filename")
    FileName$ = ImageName$
    Text1.Text = FileName$
    
    End Sub
    
    Sub On_Event_CtrlShiftV(FileName$)
    
    Dim FilePath$, MouseX&, MouseY&
    
    FilePath$ = "c:\AnyLocation\"
    SavePicture Picture1.Image, FilePath$ & FileName$ & ".png"
    
    Call GetCursorPos(Mpos)
    MouseX = Mpos.x
    MouseY = Mpos.y
    
    'drop the saved image at cursorposition as if it was dragged and dropped.
    
    
    End Sub
    
    Private Sub Timer1_Timer()
    
    If Picture1.Picture Then
        If GetAsyncKeyState(vbKeyF9) Then
            'Hotkey pressed,do dragdrop at mousepos
            Call On_Event_CtrlShiftV(Text1.Text)
                    
        End If
    End If
    End Sub
    Module:
    Code:
    Option Explicit
    
    Public Declare Function SetCursorPos Lib "user32" (ByVal x As Long, ByVal y As Long) As Long
    Public Declare Function GetCursorPos Lib "user32" (lpPoint As POINTAPI) As Long
    
    Declare Function GetAsyncKeyState Lib "user32" (ByVal vKey As Long) As Integer
    
    Public Const VK_RSHIFT = &HA1
    Public Const VK_RCONTROL = &HA3
    
    Public Type POINTAPI
        x As Long
        y As Long
    End Type
    Public Mpos As POINTAPI
    Public FileName$
    Im just not sure how to begin the dropping of the file that is created.
    Last edited by rikdol; Feb 6th, 2020 at 10:49 AM. Reason: change to: FileType Image (BMP,JPG,PNG)

  2. #2

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    Re: Simulate drag and drop image from clipboard

    Im afraid the question is not as hard as it may seem but my phrasing is off..

    In short: I'm trying to drop an image loaded from either a picturebox or file, as if it was dragged and dropped like you do in windows explorer. While my app is in the background.

    The last thing i tried was use the following:

    Code:
    ssfDESKTOP = 0
    FILE = FileName$
    
    With CreateObject("Shell.Application").NameSpace(ssfDESKTOP)
        With .ParseName(FILE)
            .InvokeVerb "copy" 'This is a canonical verb and should work for any
                               'regional and language settings.
        End With
    End With
    But it only seems like the 'Paste' button in the top toolbar of an explorer window lights up. and it's not pasting..

    How should i approach the last step, or does it require a different step before it.

  3. #3

  4. #4
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    Re: Simulate drag and drop image from clipboard

    I could not work out what you were requesting.
    Why not attach a project, and place a comment(s) at appropriate spot in the code, so we know what you are attempting to do ?

  5. #5
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    Re: Simulate drag and drop image from clipboard

    Why not just paste?

  6. #6

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    Re: Simulate drag and drop image from clipboard

    Quote Originally Posted by fafalone View Post
    Drop it where? If it's in your app why wouldn't you just pass the image directly to whatever processes it after you read the data from a dropped object?
    Drop it onto google chrome, while i have a wordpress (gutenberg) editor open there. This is important since it's the only way the image will be saved to the server with it's appropriate filename.
    You can already paste images from clipboard to the editor, but filenames will be randomized.

    Quote Originally Posted by Bobbles View Post
    I could not work out what you were requesting.
    Why not attach a project, and place a comment(s) at appropriate spot in the code, so we know what you are attempting to do ?
    Im doing this as we speak and ill attach the project here:Drag n Drop Image From Clipboard.zip

    Any and all comments are useful..

  7. #7

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    Re: Simulate drag and drop image from clipboard

    Quote Originally Posted by dilettante View Post
    Why not just paste?
    i chose to upload the project. but also reviewed my question, and with new insight i rephrased my question. I couldn't change the thread title accordingly though.

    It's actually not far from this question i think (old thread 2005)

    http://www.vbforums.com/showthread.p...s-**RESOLVED**

    And my search also came up with the proper description for what i am trying to do: 'Programmatically drag and drop an image file' But i can't change my thread title accordingly.


    Difference is that i want to start the Drag action with a hotkey (grabbing a file by it's full path), and use the mouse to drop it anywhere that accepts dropping files.
    Last edited by rikdol; Jan 27th, 2020 at 03:50 PM. Reason: Additional info..

  8. #8

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    Re: Simulate drag and drop image from clipboard

    Quote Originally Posted by dilettante View Post
    Why not just paste?
    im sorry i misunderstood.

    Paste doesn't work in alot of programs, where drag and drop does work. Specifically, i need to paste it into the wordpress gutenberg editor, pasting from clipboard will result in a random filename. Dragging and dropping however will upload the media with the filename it came with.

    So my program allows to snip an image, and name it. Once it's saved (preferably as a file) i need a hotkey to 'drop' it at the mouse location.

  9. #9

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    Re: Simulate drag and drop image from clipboard

    Update, since it feels i am getting closer to the solution.

    At this moment i can successfully press my hotkey, and pass the imagefile to OLEStartDrag.

    I can also drop this file in a folder. but only when i started the OLEStartDrag when my app has the focus (for a reason i can't explain) and only when: Data.SetData , vbCFFiles

    3 problems i've noticed so far:

    1-It seems the DataObject will only contain 'imagedata' if i call: Image1.OLEDrag while my app has focus.

    2-It seems to only work when SetData is: Data.SetData ,vbCFFiles (' vbCFDIB and ' vbCFBitmap don't work )

    3-The mouse cursor is not showing a different icon when i move the mouse outside the form. not when i drag over an explorer window and neither when i hover above chrome. (this might be caused by the getfeedback event that i'm not doing anything with atm..)

    But for some reason, with all of the above, it's not the same action as when i would physically drag and drop the image myself.

    This is the code i added :

    Code:
    Sub On_Event_Keypress(FileName$)
    
    'When the F9 key is pressed
    
    Dim FilePath$, MouseX&, MouseY&
    
    FilePath$ = App.Path + "\" 'Save the image to the current App.Path root
    
    SavePicture Image1.Picture, FilePath$ & FileName$ & ".jpg" 'Save picture to Disk
    FullFilePath$ = FilePath$ & FileName$ & ".jpg"
    
    Call PasteIt(FullFilePath$) 'Load image from Imagelocation and DragAndDrop it where mouse currently is.
    
    
    End Sub
    
    
    Public Sub PasteIt(ByVal FileName As String)
    
    Image1.DragMode = vbManual
    Image1.OLEDrag 'Drag vbBeginDrag 'Begin dragging by calling the OLEDrag method.OLEDrag
    
    End Sub
    
    Private Sub Image1_OLEStartDrag(Data As DataObject, AllowedEffects As Long)
    
    Debug.Print FullFilePath$
    
    Data.Clear
    Data.SetData , vbCFFiles 'vbCFDIB ' vbCFBitmap '
    Data.Files.Add FullFilePath$
    AllowedEffects = vbDropEffectCopy
    
    Debug.Print "Image1_OLEStartDrag"
    
    End Sub

  10. #10

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    Re: Simulate drag and drop image from clipboard

    I was wondering, since there was no followup, if there is something i missed. Or should i stop figuring out how to make it work? Dropping a file programmatically

  11. #11
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    Re: Simulate drag and drop image from clipboard

    If you want to drag CF_PNG format as per your original post to an external app (just vbCFFFiles, which is CF_HDROP, isn't good enough as Post #9 suggests), you're going to have to use API drag/drop instead of the native VB way, see here.

  12. #12

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    Re: Simulate drag and drop image from clipboard

    Yes, thank you for replying

    i found an older version of your example, here: http://www.vbforums.com/showthread.p...rer-drag-image

    but this had an error in it's example, and i didn't want to necro that thread.

    So i'm really glad you showing me the 'newer version'. Ill work on it tonight..

  13. #13
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    Re: Simulate drag and drop image from clipboard

    An error in the main sample or the test class later on in the thread? If it's the main demo definitely post about it so I can fix it.

    The projects do different things; the one you linked to is for receiving dropped files, not dragging them. There's no support for initiating a drag from your app to another. And the newer one won't put CF_HDROP in (you could, but there's no code for it in that demo: You'd fill a DROPFILES structure with double-null terminated full paths and copy it into memory like the other formats.).

    I do have another project that drags out files (but not with CF_HDROP, it uses item id lists):
    [VB6] API File Drag from multiple paths w/o native OLE or dragsource, SHDoDragDrop

    But that will not add the CF_PNG format either unless you add code to modify the IDataObject from the newer project; I don't know if your target will support item ids so if you do still need CF_HDROP you'd need to add that as well like described above).

    If you want to add CF_HDROP to an IDataObject in either project, here's a sub for that with Unicode support (the version in the 'API File Drag' thread doesn't support Unicode):
    Code:
    Public Sub IDO_AddHDROPW(ido As oleexp.IDataObject, sFiles() As String)
    Dim i As Long
    Dim fmt As FORMATETC
    Dim stg As STGMEDIUM
    Dim s As String
    Dim df As oleexp.DROPFILES
    Dim hGlobal As Long
    Dim lpGlobal As Long
    Dim hr As Long
    
    For i = 0 To UBound(sFiles)
      s = s & sFiles(i) & vbNullChar
    Next
    s = s & vbNullChar
      
    
    hGlobal = GlobalAlloc(GHND, Len(df) + LenB(s))
    
    If hGlobal Then
        lpGlobal = GlobalLock(hGlobal)
        df.pFiles = LenB(df)
        df.fWide = 1
        Call CopyMemory(ByVal lpGlobal, df, LenB(df))
        Call CopyMemory(ByVal (lpGlobal + LenB(df)), ByVal StrPtr(s), LenB(s))
        Call GlobalUnlock(hGlobal)
    
        fmt.cfFormat = CF_HDROP
        fmt.dwAspect = DVASPECT_CONTENT
        fmt.lindex = -1
        fmt.pDVTARGETDEVICE = 0
        fmt.TYMED = TYMED_HGLOBAL
        
        stg.TYMED = TYMED_HGLOBAL
        stg.Data = lpGlobal
        
        ido.SetData fmt, stg, 1
    End If
    
    End Sub
    Use this version even if you don't need Unicode; it produces a byte-for-byte equivalent entry to when you drag/copy from Explorer, so guaranteed to work.

  14. #14

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    Re: Simulate drag and drop image from clipboard

    thanks to your example alot has been cleared up.

    I've changed the way it works for me now, and a second form will popup at my mouseposition, with a button, to be able to start the drag action on the mousedown event.

    After this i noticed a problem with the fileformat. i used dilettante's SavePicture class to make sure a proper png/jpg was saved.

    And i am now able to grab a file and drop it, using a drag action from the commandbutton.

    What it does is the following:
    It checks the clipboard for a bitmap (which is the format the windows 10 snippingtool uses)
    if there is one it will start to listen for 2 hotkeys. hotkey1 will show an inputbox for filename input, hotkey 2 will show form2 with the drag button at mousepos.
    From there, the previously saved file can be dragged anywhere, where 'dropping' is supported. In my case, into the wordpress editor so it keeps it's filename.

    The program was a bit too quick at first. It tried to read the clipboard whilst win10 was still writing to it, resulting in an Error 521: Can't Open Clipboard". Which was fixed with a simple Sleep before accessing the clipboard.

    Also some 'doevents' were necessary, or the form or image control wouldn't update. w

    The only thing that i noticed was that the inputbox has a bug where it seems to miss the first character entered, as if pressing a button gives a Windows 'ping' and then has the proper focus to continue input.

    Many thanks to everyone able to shine some light on the matter.

    An error in the main sample or the test class later on in the thread? If it's the main demo definitely post about it so I can fix it.
    This seemed to be an error on another machine that didn't show up on my own desktop. Nothing to report here.

    I've attached it here so it might help someone as VBForums has helped me. I'm still learning so any and all feedback/criticism is welcome.

  15. #15

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    Re: Simulate drag and drop image from clipboard

    removed... duplicate
    Attached Files Attached Files
    Last edited by rikdol; Feb 5th, 2020 at 06:23 PM. Reason: removed... duplicate

  16. #16

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    Re: [RESOLVED] Simulate drag and drop image from clipboard

    There is a small 'bug' with the inputbox that i don't know the reason for.

    Once it comes up by pressing F10 ( and an image is on the clipboard) it seems to ignore the first character typed. and an error sound produced as if it didnt have the focus.

    What could be the reason for this.

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