how to make an image draggable?

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I try to implement Drag & Drop in my application.
It works rather well except I'm not able to drag in other application like,
say, word.

I tryed to look at what IE does and when I drag animage from IE it has the
follwoing formats:
[0]: "UntrustedDragDrop"
[1]: "FileDrop"
[2]: "FileNameW"
[3]: "FileName"
[4]: "DeviceIndependentBitmap"
[5]: "HTML Format"

In my code I created my 'drag value' as follow:

byte[] imageData = ....;
Bitmap bmp = new Bimtap(new MemoryStream(imageData));


DataObject dao = new DataObject();
dao.SetData(DataFormats.Bitmap, bmp);
dao.SetData("DeviceIndependentBitmap", imageData);

But that doesn't work....
Beside when I drag from IE the form DeviceIndependantBitmap is a stream,
whereas with my code I generetae either a byte[] or a proxy

what could I do?
I would like to drag image from my application without having to save them
to a file....
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Re: how to make an image draggable? by Michael

Michael
Fri Feb 03 10:24:18 CST 2006

The .Net clipboard format "DeviceIndependentBitmap" expects a stream
consisting of a packed DIB.

The packed DIB's layout is as follows:
BITMAPINFOHEADER
ColorTable or Bitfields, if necessary
Bitmap's bits

When you open a bitmap as a stream, the stream consists of
a BITMAPFILEHEADER plus the packed DIB structure
outlined above.

All you need to do is create a MemoryStream representing the packed DIB
and read the bytes after the BITMAPFILEHEADER into your new stream.


"Lloyd Dupont" <net.galador@ld> wrote in message
news:OV%23W%23IIKGHA.2040@TK2MSFTNGP14.phx.gbl...
>I try to implement Drag & Drop in my application.
> It works rather well except I'm not able to drag in other application
> like, say, word.
>
> I tryed to look at what IE does and when I drag animage from IE it has the
> follwoing formats:
> [0]: "UntrustedDragDrop"
> [1]: "FileDrop"
> [2]: "FileNameW"
> [3]: "FileName"
> [4]: "DeviceIndependentBitmap"
> [5]: "HTML Format"
>
> In my code I created my 'drag value' as follow:
>
> byte[] imageData = ....;
> Bitmap bmp = new Bimtap(new MemoryStream(imageData));
>
>
> DataObject dao = new DataObject();
> dao.SetData(DataFormats.Bitmap, bmp);
> dao.SetData("DeviceIndependentBitmap", imageData);
>
> But that doesn't work....
> Beside when I drag from IE the form DeviceIndependantBitmap is a stream,
> whereas with my code I generetae either a byte[] or a proxy
>
> what could I do?
> I would like to drag image from my application without having to save them
> to a file....
>


Top

Re: how to make an image draggable? by Lloyd

Lloyd
Fri Feb 03 18:12:05 CST 2006

Thanks Michael..

"Michael Phillips, Jr." <mphillips53@nospam.jun0.c0m> wrote in message
news:%23O$GJ5NKGHA.532@TK2MSFTNGP15.phx.gbl...
> The .Net clipboard format "DeviceIndependentBitmap" expects a stream
> consisting of a packed DIB.
>
> The packed DIB's layout is as follows:
> BITMAPINFOHEADER
> ColorTable or Bitfields, if necessary
> Bitmap's bits
>
> When you open a bitmap as a stream, the stream consists of
> a BITMAPFILEHEADER plus the packed DIB structure
> outlined above.
>
> All you need to do is create a MemoryStream representing the packed DIB
> and read the bytes after the BITMAPFILEHEADER into your new stream.
>
>
> "Lloyd Dupont" <net.galador@ld> wrote in message
> news:OV%23W%23IIKGHA.2040@TK2MSFTNGP14.phx.gbl...
>>I try to implement Drag & Drop in my application.
>> It works rather well except I'm not able to drag in other application
>> like, say, word.
>>
>> I tryed to look at what IE does and when I drag animage from IE it has
>> the follwoing formats:
>> [0]: "UntrustedDragDrop"
>> [1]: "FileDrop"
>> [2]: "FileNameW"
>> [3]: "FileName"
>> [4]: "DeviceIndependentBitmap"
>> [5]: "HTML Format"
>>
>> In my code I created my 'drag value' as follow:
>>
>> byte[] imageData = ....;
>> Bitmap bmp = new Bimtap(new MemoryStream(imageData));
>>
>>
>> DataObject dao = new DataObject();
>> dao.SetData(DataFormats.Bitmap, bmp);
>> dao.SetData("DeviceIndependentBitmap", imageData);
>>
>> But that doesn't work....
>> Beside when I drag from IE the form DeviceIndependantBitmap is a stream,
>> whereas with my code I generetae either a byte[] or a proxy
>>
>> what could I do?
>> I would like to drag image from my application without having to save
>> them to a file....
>>
>
>


Top

Re: how to make an image draggable? by JohnSmith

JohnSmith
Fri Apr 07 08:27:02 CDT 2006

Another way is to use the rtf data of the image and drag that.

Here's what to do...Open Word Pad. Drag and Drop your image into Word Pad
(and nothing but the image). Save the document as rtf. Close it and open
the document in Notepad. Notepad will display all the rtf data. Copy all the
rtf data and then, for your drag drop, do:

string rtfcode = @"rtfcode goes here";
object rtfDropData = new DataObject(DataFormats.Rtf, rtfcode);
YourControl.DoDragDrop(rtfDropData, DragDropEffects.Copy);

Now when you drag and drop the rtf data into word, your image will appear



"Lloyd Dupont" wrote:

> Thanks Michael..
>
> "Michael Phillips, Jr." <mphillips53@nospam.jun0.c0m> wrote in message
> news:%23O$GJ5NKGHA.532@TK2MSFTNGP15.phx.gbl...
> > The .Net clipboard format "DeviceIndependentBitmap" expects a stream
> > consisting of a packed DIB.
> >
> > The packed DIB's layout is as follows:
> > BITMAPINFOHEADER
> > ColorTable or Bitfields, if necessary
> > Bitmap's bits
> >
> > When you open a bitmap as a stream, the stream consists of
> > a BITMAPFILEHEADER plus the packed DIB structure
> > outlined above.
> >
> > All you need to do is create a MemoryStream representing the packed DIB
> > and read the bytes after the BITMAPFILEHEADER into your new stream.
> >
> >
> > "Lloyd Dupont" <net.galador@ld> wrote in message
> > news:OV%23W%23IIKGHA.2040@TK2MSFTNGP14.phx.gbl...
> >>I try to implement Drag & Drop in my application.
> >> It works rather well except I'm not able to drag in other application
> >> like, say, word.
> >>
> >> I tryed to look at what IE does and when I drag animage from IE it has
> >> the follwoing formats:
> >> [0]: "UntrustedDragDrop"
> >> [1]: "FileDrop"
> >> [2]: "FileNameW"
> >> [3]: "FileName"
> >> [4]: "DeviceIndependentBitmap"
> >> [5]: "HTML Format"
> >>
> >> In my code I created my 'drag value' as follow:
> >>
> >> byte[] imageData = ....;
> >> Bitmap bmp = new Bimtap(new MemoryStream(imageData));
> >>
> >>
> >> DataObject dao = new DataObject();
> >> dao.SetData(DataFormats.Bitmap, bmp);
> >> dao.SetData("DeviceIndependentBitmap", imageData);
> >>
> >> But that doesn't work....
> >> Beside when I drag from IE the form DeviceIndependantBitmap is a stream,
> >> whereas with my code I generetae either a byte[] or a proxy
> >>
> >> what could I do?
> >> I would like to drag image from my application without having to save
> >> them to a file....
> >>
> >
> >
>
>
>
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