Hi,
can anyone should me how to use the Bitblt api function in the windows "gdi32" file? Like declarations, how to draw it on the screen. Also can Bitblt function be use to make animations. Please provide an example. thankx.
Private Type RECT
Left As Long
Top As Long
Right As Long
Bottom As Long
End Type
Private Declare Function GetDeviceCaps Lib "gdi32" (ByVal hdc As Long, ByVal nIndex As Long) As Long
Private Declare Function BitBlt Lib "gdi32" (ByVal hDestDC 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 dwRop As Long) As Long
Private Declare Function CreateCompatibleBitmap Lib "gdi32" (ByVal hdc As Long, ByVal nWidth As Long, ByVal nHeight As Long) As Long
Private Declare Function CreateCompatibleDC Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function GetDC Lib "user32" (ByVal hWnd 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 CreateEllipticRgn Lib "gdi32" (ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long
Private Declare Function SetWindowRgn Lib "user32" (ByVal hWnd As Long, ByVal hRgn As Long, ByVal bRedraw As Boolean) As Long
Private Declare Function CreateFont Lib "gdi32" Alias "CreateFontA" (ByVal nHeight As Long, ByVal nWidth As Long, ByVal nEscapement As Long, ByVal nOrientation As Long, ByVal fnWeight As Long, ByVal fdwItalic As Boolean, ByVal fdwUnderline As Boolean, ByVal fdwStrikeOut As Boolean, ByVal fdwCharSet As Long, ByVal fdwOutputPrecision As Long, ByVal fdwClipPrecision As Long, ByVal fdwQuality As Long, ByVal fdwPitchAndFamily As Long, ByVal lpszFace As String) As Long
Private Declare Function SelectObject Lib "gdi32" (ByVal hdc As Long, ByVal hObject As Long) As Long
Private Declare Function TextOut Lib "gdi32" Alias "TextOutA" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long, ByVal lpString As String, ByVal nCount As Long) As Long
Private Declare Function MulDiv Lib "kernel32" (ByVal nNumber As Long, ByVal nNumerator As Long, ByVal nDenominator As Long) As Long
Private Declare Function SetBkMode Lib "gdi32" (ByVal hdc As Long, ByVal nBkMode As Long) As Long
Private Declare Function GetSysColorBrush Lib "user32" (ByVal nIndex As Long) As Long
Private Declare Function FillRect Lib "user32" (ByVal hdc As Long, lpRect As RECT, ByVal hBrush As Long) As Long
Private Declare Function SetRect Lib "user32" (lpRect As RECT, ByVal X1 As Long, ByVal Y1 As Long, ByVal X2 As Long, ByVal Y2 As Long) As Long
Dim mDC As Long, mBitmap As Long
Private Sub Form_Click()
Unload Me
End Sub
Private Sub Form_Load()
'KPD-Team 1999
'URL:
'E-Mail: KPDTeam@Allapi.net
Dim mRGN As Long, Cnt As Long, mBrush As Long, R As RECT
'Create a device context, compatible with the screen
mDC = CreateCompatibleDC(GetDC(0))
'Create a bitmap, compatible with the screen
mBitmap = CreateCompatibleBitmap(GetDC(0), Me.Width / Screen.TwipsPerPixelX, Me.Height / Screen.TwipsPerPixelY)
'Select the bitmap nito the device context
SelectObject mDC, mBitmap
'Set the bitmap's backmode to transparent
SetBkMode mDC, TRANSPARENT
'Set the rectangles' values
SetRect R, 0, 0, Me.Width / Screen.TwipsPerPixelX, Me.Height / Screen.TwipsPerPixelY
'Fill the rect with the default window-color
FillRect mDC, R, GetSysColorBrush(COLOR_WINDOW)
For Cnt = 0 To 350 Step 30
'Select the new font into the form's device context and delete the old font
DeleteObject SelectObject(mDC, CreateMyFont(24, Cnt))
'Print some text
TextOut mDC, (Me.Width / Screen.TwipsPerPixelX) / 2, (Me.Height / Screen.TwipsPerPixelY) / 2, Message, Len(Message)
Next Cnt
'Create an elliptical region
mRGN = CreateEllipticRgn(0, 0, Me.Width / Screen.TwipsPerPixelX, Me.Height / Screen.TwipsPerPixelY)
'Set the window region
SetWindowRgn Me.hWnd, mRGN, True
'delete our elliptical region
DeleteObject mRGN
End Sub
Function CreateMyFont(nSize As Integer, nDegrees As Long) As Long
'Create a specified font
CreateMyFont = CreateFont(-MulDiv(nSize, GetDeviceCaps(GetDC(0), LOGPIXELSY), 72), 0, nDegrees * 10, 0, FW_NORMAL, False, False, False, DEFAULT_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, PROOF_QUALITY, DEFAULT_PITCH, "Times New Roman"
End Function
Private Sub Form_Paint()
'Copy the picture to the form
BitBlt Me.hdc, 0, 0, Me.Width / Screen.TwipsPerPixelX, Me.Height / Screen.TwipsPerPixelY, mDC, 0, 0, vbSrcCopy
End Sub
Private Sub Form_Unload(Cancel As Integer)
'clean up
DeleteDC mDC
DeleteObject mBitmap
End Sub
You can download them. If you don't want to become a member, do this:
Download upto 5 examples then you will be asked to join. Just delete the 'VB' cookie & click F5 (Refresh) to continue the downloads. You have to do this after every 5 downloads. For me its sometimes quicker to do this then log in.
It has over 2.5 million line of VB code hosted - brilliant site!!
Psidro
------
I'm glad I could amuse you by pasting this example in. I did it because I don't have the time to write the code because I'm working on two small projects of around 5000 lines of code each.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.