by IRBMe (22 Submissions)
Category: Games
Compatability: Visual Basic 3.0
Difficulty: Intermediate
Date Added: Wed 3rd February 2021
Rating: 
(4 Votes)
Do you have a game with too many pictureboxes for your graphics. Want to make your game really proffessional by loading them straight into RAM. Even returns all the properties of your bitmap. Can be used with 3 liones of code. This is to be used with bitblt. Not compatible with Windows NT due to the loadfromfile constant being restricted or something.
Inputs
Use it like this:
Private sub sub Form_Load()
Me.show
Dim lngDC as long
Dim bmpProperties as BITMAP
lngDC = GenerateDC(C:\Bitmap.Bmp,bmpProperties)
Msgbox BmpProperties.bmwidth
me.scalemode = vbpixels
Bitblt me.hdc,0,0,me.scalewidth,me.scaleheight,lngDC,0,0,vbsrccopy
deletegenerateddc lngdc
end sub
Assumes
You place the code in a module.
Code Returns
Puts a bitmap in memory and returns its properties and a DC to it. Then when you are finished just delete the dc using the provided sub.
Side Effects
Remember to delete the DC or you might start losing some resources. Dont attempt to use on Windows NT.
API DeclarationsVarious. See code
VBcodersOption Explicit
Private Declare Function CreateCompatibleDC Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function DeleteDC Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long
Private Declare Function GetObjectAPI Lib "gdi32" Alias "GetObjectA" (ByVal hObject As Long, ByVal nCount As Long, lpObject As Any) As Long
Private 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
Private Declare Function SelectObject Lib "gdi32" (ByVal hdc As Long, ByVal hObject As Long) As Long
Private Const IMAGE_BITMAP As Long = 0
Private Const LR_LOADFROMFILE As Long = &H10
Private Const LR_CREATEDIBSECTION As Long = &H2000
Public Type BITMAP
bmType As Long
bmWidth As Long
bmHeight As Long
bmWidthBytes As Long
bmPlanes As Integer
bmBitsPixel As Integer
bmBits As Long
End Type
Public Function GenerateDC(ByVal FileName As String, BitmapProperties As BITMAP) As Long
Dim DC As Long
Dim hBitmap As Long
DC = CreateCompatibleDC(0)
If DC < 1 Then
GenerateDC = 0
Exit Function
End If
hBitmap = LoadImage(0, FileName, IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE Or LR_CREATEDIBSECTION)
If hBitmap = 0 Then
DeleteDC DC
GenerateDC = 0
Exit Function
End If
GetObjectAPI hBitmap, Len(BitmapProperties), BitmapProperties
SelectObject DC, hBitmap
GenerateDC = DC
DeleteObject hBitmap
End Function
Public Function DeleteGeneratedDC(DC As Long) As Long
If DC > 0 Then
DeleteGeneratedDC = DeleteDC(DC)
Else
DeleteGeneratedDC = 0
End If
End Function
'Gimme somefeedback and votes please. Thats the only time I'm gonna ask
