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Screen Resolution problem

Brando
Brando asked
on
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Last Modified: 2006-11-17
I want to test my program in other resolutions, but the
BackGround doesn't fit...
I used a PictureBox control to contain the BackGround
(and i can't change it into an image control because of
some functions of the program).
I'd like to know if there is something like the stretch
property of the image controls for the picturebox control.
Or, maybe, how to fit it accordingly to the resolution of
the user...Thank you!
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Commented:
You can get the resoultion of the screen by the Screen.Width and Screen.Height properties.  Then adjust your picturebox Width and Height accordingly.  Once you have your picturebox to the right size, use LoadBitmap to get a handle to the bitmap and copy the picture to the picturebox with StrechBlt.

Declare Function StretchBlt Lib "gdi32" Alias "StretchBlt" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal nSrcWidth As Long, ByVal nSrcHeight As Long, ByVal dwRop As Long) As Long

Declare Function LoadImage Lib "user32" Alias "LoadImageA" (ByVal hInst As Long, ByVal lpsz As String, ByVal un1 As Long, ByVal n1 As Long, ByVal n2 As Long, ByVal un2 As Long) As Long

In LoadImage, hInst should be null, lpsz should be the path and filename of the Bitmap, un1 should be IMAGE_BITMAP, n1 and n2 are the width and height of the bitmap, and un2 should be LR_LOADFROMFILE.

In StrechBlt, hDC will be the handle to the device you are copying to, in this case, Picture1.hDC.  x and y are the upper left coordinates of the destination.  nWidth and nHeight are the width and height of the destination.  hSrcDC is the Device context of the bitmap, returned by the LoadImage call.  xSrc and ySrc are the upper left coordinates of the bitmap.  nSrcWidth and nSrcHeight are the width and height of the bitmap.  dwRop should be SRCCOPY.

Commented:
Sorry dirtdart, but this won't work as you propose because

"The LoadImage() API can be used to load a bitmap from a BMP file. However, it does not return palette information."

So, you end up with a picture with background color.

Commented:
In that case, the easiest way would probably be to load the bitmap into a "hidden" picturebox, then transfer it from one to the other using StrechBlt.

Commented:
Yes, that is the easiest way.

Commented:
Any particular reason why my answer was rejected?  Just curious, and it might help others to find out what you want.

Commented:
dirtdart, provide a sample Form_Resize event procedure that demonstrates your previously proposed answer - and propose it as the answer to this question.

Commented:
... as for the LoadImage API comments, you could use the native VB method:

Set Picture1.Picture = LoadPicture("FilePathName")

Commented:
... but then again, you could also use the native VB "PaintPicture" method to copy/stretch the bitmap.

Commented:
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Commented:
I got it working using mrmicks suggestion using native VB methods .I would like mrmick to have the points. Thank you, MrMick.
( i don't know what an api should be...)

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