I've been looking on the Internet for a way to convert a DIB to a Bitmap
without success.
Now I'm wondering if that is the approach I should be taking.
All I want to do is display the DIB or draw it into a Bitmap.
Is there a graphics method that can help?
thanks
12  3322 
The System.Drawing.Bitmap object is a DIB. If you want a DDB, use
GetHbitmap. If you want to construct a Bitmap from an existing DIB created
with CreateDIBSection or a GDI DDB handle, use one of the constructors of
the Bitmap class.
Use the Graphics method DrawImage to display or convert to a different
PixelFormat.
If you want to work with the native GDI API, then use CreateBitmap to create
a DDB or use CreateDIBSection to create a DIB.
To convert one to the other, use BitBlt or any of the other GDI "BitBlt"
variations.
" active" <ac**********@a-znet.comwrote in message
news:uk**************@TK2MSFTNGP04.phx.gbl...
I've been looking on the Internet for a way to convert a DIB to a Bitmap
without success.
Now I'm wondering if that is the approach I should be taking.
All I want to do is display the DIB or draw it into a Bitmap.
Is there a graphics method that can help?
thanks
I hate it when I don't ask the question right.
I want to get a DIB from the clipboard.
What the clipboard produces is a MemoryStream.
I have read that stream and obtained the palette in the DIB.
Now I'd like to get the bitmap which I think is harder to read from the
stream because there are so many variations.
I suppose at this point it is the same as reading the bitmap from a file
into a Bitmap.
That's what I've been looking for.
Thanks
"Michael Phillips, Jr." <mp*********@nospam.jun0.c0mwrote in message
news:ew**************@TK2MSFTNGP04.phx.gbl...
The System.Drawing.Bitmap object is a DIB. If you want a DDB, use
GetHbitmap. If you want to construct a Bitmap from an existing DIB
created with CreateDIBSection or a GDI DDB handle, use one of the
constructors of the Bitmap class.
Use the Graphics method DrawImage to display or convert to a different
PixelFormat.
If you want to work with the native GDI API, then use CreateBitmap to
create a DDB or use CreateDIBSection to create a DIB.
To convert one to the other, use BitBlt or any of the other GDI "BitBlt"
variations.
" active" <ac**********@a-znet.comwrote in message
news:uk**************@TK2MSFTNGP04.phx.gbl...
>I've been looking on the Internet for a way to convert a DIB to a Bitmap
without success.
Now I'm wondering if that is the approach I should be taking.
All I want to do is display the DIB or draw it into a Bitmap.
Is there a graphics method that can help?
thanks
What the clipboard produces is a MemoryStream.
You can construct a Bitmap object from a MemoryStream object as is. Use the
Bitmap constructor or method which uses a stream object as an argument.
" active" <ac**********@a-znet.comwrote in message
news:up**************@TK2MSFTNGP05.phx.gbl...
>I hate it when I don't ask the question right.
I want to get a DIB from the clipboard.
What the clipboard produces is a MemoryStream.
I have read that stream and obtained the palette in the DIB.
Now I'd like to get the bitmap which I think is harder to read from the
stream because there are so many variations.
I suppose at this point it is the same as reading the bitmap from a file
into a Bitmap.
That's what I've been looking for.
Thanks
"Michael Phillips, Jr." <mp*********@nospam.jun0.c0mwrote in message
news:ew**************@TK2MSFTNGP04.phx.gbl...
>The System.Drawing.Bitmap object is a DIB. If you want a DDB, use
GetHbitmap. If you want to construct a Bitmap from an existing DIB
created with CreateDIBSection or a GDI DDB handle, use one of the
constructors of the Bitmap class.
Use the Graphics method DrawImage to display or convert to a different
PixelFormat.
If you want to work with the native GDI API, then use CreateBitmap to
create a DDB or use CreateDIBSection to create a DIB.
To convert one to the other, use BitBlt or any of the other GDI "BitBlt"
variations.
" active" <ac**********@a-znet.comwrote in message
news:uk**************@TK2MSFTNGP04.phx.gbl...
>>I've been looking on the Internet for a way to convert a DIB to a Bitmap
without success.
Now I'm wondering if that is the approach I should be taking.
All I want to do is display the DIB or draw it into a Bitmap.
Is there a graphics method that can help?
thanks
I've tried that, can't remember what happened but I concluded that the
stream for the constructor should start with the bitmap data and not with
the stuff in the stream for the header and palette. Once I read the header
and the palette I must be close.
Is that true?
If so, what I need to know might be simply (or not so simply) where to
position the stream. Just after the palette?
Then maybe use a seek command.
Or convert the stream to bytes and from bytes to a stream without the
leading bytes.
Thanks
"Michael Phillips, Jr." <mp*********@nospam.jun0.c0mwrote in message
news:eo*************@TK2MSFTNGP06.phx.gbl...
>What the clipboard produces is a MemoryStream.
You can construct a Bitmap object from a MemoryStream object as is. Use
the Bitmap constructor or method which uses a stream object as an
argument.
" active" <ac**********@a-znet.comwrote in message
news:up**************@TK2MSFTNGP05.phx.gbl...
>>I hate it when I don't ask the question right.
I want to get a DIB from the clipboard.
What the clipboard produces is a MemoryStream.
I have read that stream and obtained the palette in the DIB.
Now I'd like to get the bitmap which I think is harder to read from the
stream because there are so many variations.
I suppose at this point it is the same as reading the bitmap from a file
into a Bitmap.
That's what I've been looking for.
Thanks
"Michael Phillips, Jr." <mp*********@nospam.jun0.c0mwrote in message
news:ew**************@TK2MSFTNGP04.phx.gbl...
>>The System.Drawing.Bitmap object is a DIB. If you want a DDB, use
GetHbitmap. If you want to construct a Bitmap from an existing DIB
created with CreateDIBSection or a GDI DDB handle, use one of the
constructors of the Bitmap class.
Use the Graphics method DrawImage to display or convert to a different
PixelFormat.
If you want to work with the native GDI API, then use CreateBitmap to
create a DDB or use CreateDIBSection to create a DIB.
To convert one to the other, use BitBlt or any of the other GDI "BitBlt"
variations.
" active" <ac**********@a-znet.comwrote in message
news:uk**************@TK2MSFTNGP04.phx.gbl...
I've been looking on the Internet for a way to convert a DIB to a
Bitmap without success.
Now I'm wondering if that is the approach I should be taking.
All I want to do is display the DIB or draw it into a Bitmap.
Is there a graphics method that can help?
thanks
Sorry about my last post.
If you are specifically pulling a DIB off the clipboard, you need to do some
more work.
Follow these steps:
1) Read the BITMAPINFOHEADER from the stream
2) Read the color table or bitfield array, if any. Only Indexed bitmaps
have a color table. Only 16bit or 32bit bitmaps may have a bitfiield array.
3) Read the Bitmap's color pixel data.
Once you have read the above from the memory stream, you may use any one of
the Bitmap constructors or methods to create your bitmap.
If you want to do the least amount of work possible, then do the following:
1) Create a new MemoryStream object.
2) Create a BITMAPFILEHEADER object
Fill in the correct structure offsets. Write this structure to your new
MemoryStream
3) Using the MemoryStream from the clipboard, write it to the new
MemoryStream object following the BITMAPFILEHEADER
4) Construct your Bitmap from the new MemoryStream object as it is now in
the correct format for the Bitmap constructor
The above requires the least amount of work and marshaling. Just make sure
that you set the offsets in the BITMAPFILEHEADER structure correctly and you
must rewind the stream before using it to construct your Bitmap object.
"Michael Phillips, Jr." <mp*********@nospam.jun0.c0mwrote in message
news:eo*************@TK2MSFTNGP06.phx.gbl...
>What the clipboard produces is a MemoryStream.
You can construct a Bitmap object from a MemoryStream object as is. Use
the Bitmap constructor or method which uses a stream object as an
argument.
" active" <ac**********@a-znet.comwrote in message
news:up**************@TK2MSFTNGP05.phx.gbl...
>>I hate it when I don't ask the question right.
I want to get a DIB from the clipboard.
What the clipboard produces is a MemoryStream.
I have read that stream and obtained the palette in the DIB.
Now I'd like to get the bitmap which I think is harder to read from the
stream because there are so many variations.
I suppose at this point it is the same as reading the bitmap from a file
into a Bitmap.
That's what I've been looking for.
Thanks
"Michael Phillips, Jr." <mp*********@nospam.jun0.c0mwrote in message
news:ew**************@TK2MSFTNGP04.phx.gbl...
>>The System.Drawing.Bitmap object is a DIB. If you want a DDB, use
GetHbitmap. If you want to construct a Bitmap from an existing DIB
created with CreateDIBSection or a GDI DDB handle, use one of the
constructors of the Bitmap class.
Use the Graphics method DrawImage to display or convert to a different
PixelFormat.
If you want to work with the native GDI API, then use CreateBitmap to
create a DDB or use CreateDIBSection to create a DIB.
To convert one to the other, use BitBlt or any of the other GDI "BitBlt"
variations.
" active" <ac**********@a-znet.comwrote in message
news:uk**************@TK2MSFTNGP04.phx.gbl...
I've been looking on the Internet for a way to convert a DIB to a
Bitmap without success.
Now I'm wondering if that is the approach I should be taking.
All I want to do is display the DIB or draw it into a Bitmap.
Is there a graphics method that can help?
thanks
I used your second approach and it work great.
At least so far.
I used: bfOffBits = 1078
which I got from the Internet.
But I see other expressions which seem to require good knowledge of the
Bitmap specifications to understand.
Is 1078 OK?
If there a more general expression using data from the BITMAPINFOHEADER?
Thanks a lot for the previous precise instructions!
"Michael Phillips, Jr." <mp*********@nospam.jun0.c0mwrote in message
news:OO**************@TK2MSFTNGP02.phx.gbl...
Sorry about my last post.
If you are specifically pulling a DIB off the clipboard, you need to do
some more work.
Follow these steps:
1) Read the BITMAPINFOHEADER from the stream
2) Read the color table or bitfield array, if any. Only Indexed bitmaps
have a color table. Only 16bit or 32bit bitmaps may have a bitfiield
array.
3) Read the Bitmap's color pixel data.
Once you have read the above from the memory stream, you may use any one
of the Bitmap constructors or methods to create your bitmap.
If you want to do the least amount of work possible, then do the
following:
1) Create a new MemoryStream object.
2) Create a BITMAPFILEHEADER object
Fill in the correct structure offsets. Write this structure to your
new MemoryStream
3) Using the MemoryStream from the clipboard, write it to the new
MemoryStream object following the BITMAPFILEHEADER
4) Construct your Bitmap from the new MemoryStream object as it is now in
the correct format for the Bitmap constructor
The above requires the least amount of work and marshaling. Just make
sure that you set the offsets in the BITMAPFILEHEADER structure correctly
and you must rewind the stream before using it to construct your Bitmap
object.
Is 1078 OK?
Yes only for 8bpp bitmap with 256 colors in the palette.
You should always calculate the offsets by parsing the headers.
The typical memory layout of a bitmap is as follows:
BITMAPFILEHEADER 14 bytes
BITMAPINFOHEADER 40 bytes most of the time. Always use the size given by
the structure member
color palette 4 * nColors in palette = 1024 bytes only for 256 color
palette
for a 16bpp or 32bpp bitmap with bitfields then there will be 3 DWORDS here
for the masks instead of the color palette
bitmaps bits <---------------offset = 1078 only for an indexed bitmap with
256 colors in the palette
Do not assume anything. Parse the headers from the memory stream to
calculate the offset correctly.
You could always rewind the stream after your done calculating the correct
bitmap bit's offset.
" active" <ac**********@a-znet.comwrote in message
news:Ot**************@TK2MSFTNGP02.phx.gbl...
>I used your second approach and it work great.
At least so far.
I used: bfOffBits = 1078
which I got from the Internet.
But I see other expressions which seem to require good knowledge of the
Bitmap specifications to understand.
Is 1078 OK?
If there a more general expression using data from the BITMAPINFOHEADER?
Thanks a lot for the previous precise instructions!
"Michael Phillips, Jr." <mp*********@nospam.jun0.c0mwrote in message
news:OO**************@TK2MSFTNGP02.phx.gbl...
>Sorry about my last post.
If you are specifically pulling a DIB off the clipboard, you need to do
some more work.
Follow these steps:
1) Read the BITMAPINFOHEADER from the stream
2) Read the color table or bitfield array, if any. Only Indexed bitmaps
have a color table. Only 16bit or 32bit bitmaps may have a bitfiield
array.
3) Read the Bitmap's color pixel data.
Once you have read the above from the memory stream, you may use any one
of the Bitmap constructors or methods to create your bitmap.
If you want to do the least amount of work possible, then do the
following:
1) Create a new MemoryStream object.
2) Create a BITMAPFILEHEADER object
Fill in the correct structure offsets. Write this structure to your
new MemoryStream
3) Using the MemoryStream from the clipboard, write it to the new
MemoryStream object following the BITMAPFILEHEADER
4) Construct your Bitmap from the new MemoryStream object as it is now in
the correct format for the Bitmap constructor
The above requires the least amount of work and marshaling. Just make
sure that you set the offsets in the BITMAPFILEHEADER structure correctly
and you must rewind the stream before using it to construct your Bitmap
object.
Is this what you said, converted to code?
BmH.bfOffBits = CInt(14 + BiSize)
If BiBitCount <= 8 Then
BmH.bfOffBits += 4 * (1 << BiBitCount)
ElseIf BiBitCount = 24 Then
BmH.bfOffBits += CInt(4 * BiClrUsed)
Else 'must be (BiBitCount = 16 Or BiBitCount = 32)
If BiCompression = BI_BITFIELDS Then
BmH.bfOffBits += 12
else
????? what about this
End If
End If
The typical memory layout of a bitmap is as follows:
BITMAPFILEHEADER 14 bytes
BITMAPINFOHEADER 40 bytes most of the time. Always use the size given by
the structure member
color palette 4 * nColors in palette = 1024 bytes only for 256 color
palette
for a 16bpp or 32bpp bitmap with bitfields then there will be 3 DWORDS
here for the masks instead of the color palette
bitmaps bits <---------------offset = 1078 only for an indexed bitmap with
256 colors in the palette
ElseIf BiBitCount = 24 Then
>
BmH.bfOffBits += CInt(4 * BiClrUsed)
24bpp images do not have a color table. The offset remains unchanged.
If BiCompression = BI_BITFIELDS Then
BmH.bfOffBits += 12
else
????? what about this
If BI_BITFIELDS is not set then there are no masks. The offset remains
unchanged.
Generally, if you image is not indexed or has BI_BITFIELDS then the bitmap's
bits will directly follow the BITMAPINFOHEADER.
For indexed bitmaps the size of the color table is always the number of
colors in the palette * 4.
However an indexed bitmap does not have to use all of the possible colors.
If BiBitCount <= 8 Then
BmH.bfOffBits += 4 * (1 << BiBitCount)
Always look at the number of colors used as specified in the
BITMAPINFOHEADER(i.e., biClrUsed).
Gif files are 8bpp but do not always use all of the 256 colors that are
possible in their palette.
If biClrUsed = 0 then the bitmap uses the maximum number of colors for it's
bit depth. Else the bClrUsed should be used for your calculation.
" active" <ac**********@a-znet.comwrote in message
news:uf**************@TK2MSFTNGP04.phx.gbl...
Is this what you said, converted to code?
BmH.bfOffBits = CInt(14 + BiSize)
If BiBitCount <= 8 Then
BmH.bfOffBits += 4 * (1 << BiBitCount)
ElseIf BiBitCount = 24 Then
BmH.bfOffBits += CInt(4 * BiClrUsed)
Else 'must be (BiBitCount = 16 Or BiBitCount = 32)
If BiCompression = BI_BITFIELDS Then
BmH.bfOffBits += 12
else
????? what about this
End If
End If
>The typical memory layout of a bitmap is as follows:
BITMAPFILEHEADER 14 bytes
BITMAPINFOHEADER 40 bytes most of the time. Always use the size given by
the structure member
color palette 4 * nColors in palette = 1024 bytes only for 256 color
palette
for a 16bpp or 32bpp bitmap with bitfields then there will be 3 DWORDS
here for the masks instead of the color palette
bitmaps bits <---------------offset = 1078 only for an indexed bitmap
with 256 colors in the palette
The code below is hopefully a mapping of comments by Michael Phillips, Jr.
Michael, do you agree it is OK.
If so, I'd suggest that someone with a vb.net site copy it and also find
Michael's post relating to putting/retrieving a palette on/from the
clipboard.
Both examples are complete and do not appear anywhere else. It would be nice
to save them!
Thanks again to Michael!
'Offset, in bytes, from the BITMAPFILEHEADER structure to the bitmap bits
BmH.bfOffBits = CInt(14 + BiSize)
If BiBitCount <= 8 Then
If BiClrUsed = 0 Then
'If biClrUsed = 0 then the bitmap uses the maximum number of colors
BmH.bfOffBits += 4 * (1 << BiBitCount) 'color size * max colors
Else
BmH.bfOffBits += 4 * CInt(BiClrUsed) 'color size * NColors
End If
ElseIf BiBitCount = 24 Then
'no palette so add nothing here
Else 'must be (BiBitCount = 16 Or BiBitCount = 32)
If BiCompression = BI_BITFIELDS Then
BmH.bfOffBits += 12 '3 RGB doubleword masks
Else
'no masks so add nothing here
End If
End If
BmH.bfSize = CInt(BmH.bfOffBits + DibClipboardStream.Length) ' size of file
BmH.bfOffBits = CInt(14 + BiSize)
It is not a good practice to hard code a structure's size(e.g.,
BITMAPFILEHEADER).
You can never be sure that the structure will always compile to that
size(i.e., 14 bytes) unless you lay it out explicitly(i.e., byte align)
or that Microsoft will not change the structure.
Other than that, I recommend that you test your code with other applications
that place/retrieve DIBs on the clipboard(e.g., Office, Paint, Photoshop,
etc.)
You can use the free clipboard viewer as a comparison to demonstrate that
your code get's the expected result. The other applications can be used to
test
whether or not the Dibs that your save as a file can be opened and displayed
properly.
" active" <ac**********@a-znet.comwrote in message
news:O$**************@TK2MSFTNGP05.phx.gbl...
The code below is hopefully a mapping of comments by Michael Phillips, Jr.
Michael, do you agree it is OK.
If so, I'd suggest that someone with a vb.net site copy it and also find
Michael's post relating to putting/retrieving a palette on/from the
clipboard.
Both examples are complete and do not appear anywhere else. It would be
nice to save them!
Thanks again to Michael!
'Offset, in bytes, from the BITMAPFILEHEADER structure to the bitmap bits
BmH.bfOffBits = CInt(14 + BiSize)
If BiBitCount <= 8 Then
If BiClrUsed = 0 Then
'If biClrUsed = 0 then the bitmap uses the maximum number of colors
BmH.bfOffBits += 4 * (1 << BiBitCount) 'color size * max colors
Else
BmH.bfOffBits += 4 * CInt(BiClrUsed) 'color size * NColors
End If
ElseIf BiBitCount = 24 Then
'no palette so add nothing here
Else 'must be (BiBitCount = 16 Or BiBitCount = 32)
If BiCompression = BI_BITFIELDS Then
BmH.bfOffBits += 12 '3 RGB doubleword masks
Else
'no masks so add nothing here
End If
End If
BmH.bfSize = CInt(BmH.bfOffBits + DibClipboardStream.Length) ' size of
file
I changed the code below to
BmH.bfOffBits = Marshal.SizeOf(BmH) + CInt(BiSize)
When checking I noticed that Marshal.SizeOf(BmH) returned 16!
So to the structure I added:
<StructLayout(LayoutKind.Sequential, Pack:=2)_
which fixed it (to 14).
But raised the question how come it worked with 16?
I guess the reason why it worked with 16 is because I wrote the items to the
stream, one at a time rather than writing the structure.
But if the structures were the correct size and bfOffBits pointed wrong, I
believe the first 2 bytes of the data would be skipped over.
Make sense to you?
While searching the Internet I noticed that you have been helping people for
years!
Thanks, took a while for this loop to converge
BTW Even though Visual Basic compiler specifies Sequential layout for value
types, it would not accept Pack without Sequential being explicitly
included in the statement.
"Michael Phillips, Jr." <mp*********@nospam.jun0.c0mwrote in message
news:eJ*************@TK2MSFTNGP02.phx.gbl...
>BmH.bfOffBits = CInt(14 + BiSize)
It is not a good practice to hard code a structure's size(e.g.,
BITMAPFILEHEADER).
You can never be sure that the structure will always compile to that
size(i.e., 14 bytes) unless you lay it out explicitly(i.e., byte align)
or that Microsoft will not change the structure.
Other than that, I recommend that you test your code with other
applications that place/retrieve DIBs on the clipboard(e.g., Office,
Paint, Photoshop, etc.)
You can use the free clipboard viewer as a comparison to demonstrate that
your code get's the expected result. The other applications can be used
to test
whether or not the Dibs that your save as a file can be opened and
displayed properly.
" active" <ac**********@a-znet.comwrote in message
news:O$**************@TK2MSFTNGP05.phx.gbl...
>The code below is hopefully a mapping of comments by Michael Phillips,
Jr.
Michael, do you agree it is OK.
If so, I'd suggest that someone with a vb.net site copy it and also find
Michael's post relating to putting/retrieving a palette on/from the
clipboard.
Both examples are complete and do not appear anywhere else. It would be
nice to save them!
Thanks again to Michael!
'Offset, in bytes, from the BITMAPFILEHEADER structure to the bitmap bits
BmH.bfOffBits = Marshal.SizeOf(BmH) + CInt(BiSize)
>>
If BiBitCount <= 8 Then
If BiClrUsed = 0 Then
'If biClrUsed = 0 then the bitmap uses the maximum number of
colors
BmH.bfOffBits += 4 * (1 << BiBitCount) 'color size * max colors
Else
BmH.bfOffBits += 4 * CInt(BiClrUsed) 'color size * NColors
End If
ElseIf BiBitCount = 24 Then
'no palette so add nothing here
Else 'must be (BiBitCount = 16 Or BiBitCount = 32)
If BiCompression = BI_BITFIELDS Then
BmH.bfOffBits += 12 '3 RGB doubleword masks
Else
'no masks so add nothing here
End If
End If
BmH.bfSize = CInt(BmH.bfOffBits + DibClipboardStream.Length) ' size of
file
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