?? cmemdc.cls
字號:
VERSION 1.0 CLASS
BEGIN
MultiUse = -1 'True
Persistable = 0 'NotPersistable
DataBindingBehavior = 0 'vbNone
DataSourceBehavior = 0 'vbNone
MTSTransactionMode = 0 'NotAnMTSObject
END
Attribute VB_Name = "cMemDC"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Option Explicit
' ======================================================================================
Private Declare Function CreateDCAsNull Lib "gdi32" Alias "CreateDCA" (ByVal lpDriverName As String, lpDeviceName As Any, lpOutput As Any, lpInitData As Any) As Long
Private Declare Function CreateCompatibleDC Lib "gdi32" (ByVal hdc 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 DeleteDC Lib "gdi32" (ByVal hdc As Long) As Long
Private Declare Function ReleaseDC Lib "user32" (ByVal hwnd As Long, ByVal hdc As Long) As Long
Private Declare Function SelectObject Lib "gdi32" (ByVal hdc As Long, ByVal hObject As Long) As Long
Private Declare Function DeleteObject Lib "gdi32" (ByVal hObject 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 Type BITMAP '24 bytes
bmType As Long
bmWidth As Long
bmHeight As Long
bmWidthBytes As Long
bmPlanes As Integer
bmBitsPixel As Integer
bmBits As Long
End Type
Private Declare Function GetObjectAPI Lib "gdi32" Alias "GetObjectA" (ByVal hObject As Long, ByVal nCount As Long, lpObject As Any) As Long
Private m_hDC As Long
Private m_hBmpOld As Long
Private m_hBmp As Long
Private m_lWidth As Long
Private m_lheight As Long
Public Sub CreateFromPicture(sPic As IPicture)
Dim tB As BITMAP
Dim lhDCC As Long, lhDC As Long
Dim lhBmpOld As Long
GetObjectAPI sPic.Handle, Len(tB), tB
Width = tB.bmWidth
Height = tB.bmHeight
lhDCC = CreateDCAsNull("DISPLAY", ByVal 0&, ByVal 0&, ByVal 0&)
lhDC = CreateCompatibleDC(lhDCC)
lhBmpOld = SelectObject(lhDC, sPic.Handle)
BitBlt hdc, 0, 0, tB.bmWidth, tB.bmHeight, lhDC, 0, 0, vbSrcCopy
SelectObject lhDC, lhBmpOld
DeleteDC lhDC
DeleteDC lhDCC
End Sub
Public Property Get hdc() As Long
hdc = m_hDC
End Property
Public Property Let Width(ByVal lW As Long)
If lW > m_lWidth Then
pCreate lW, m_lheight
End If
End Property
Public Property Get Width() As Long
Width = m_lWidth
End Property
Public Property Let Height(ByVal lH As Long)
If lH > m_lheight Then
pCreate m_lWidth, lH
End If
End Property
Public Property Get Height() As Long
Height = m_lheight
End Property
Private Sub pCreate(ByVal lW As Long, ByVal lH As Long)
Dim lhDC As Long
pDestroy
lhDC = CreateDCAsNull("DISPLAY", ByVal 0&, ByVal 0&, ByVal 0&)
m_hDC = CreateCompatibleDC(lhDC)
m_hBmp = CreateCompatibleBitmap(lhDC, lW, lH)
m_hBmpOld = SelectObject(m_hDC, m_hBmp)
If m_hBmpOld = 0 Then
pDestroy
Else
m_lWidth = lW
m_lheight = lH
End If
DeleteDC lhDC
End Sub
Private Sub pDestroy()
If Not m_hBmpOld = 0 Then
SelectObject m_hDC, m_hBmpOld
m_hBmpOld = 0
End If
If Not m_hBmp = 0 Then
DeleteObject m_hBmp
m_hBmp = 0
End If
m_lWidth = 0
m_lheight = 0
If Not m_hDC = 0 Then
DeleteDC m_hDC
m_hDC = 0
End If
End Sub
Private Sub Class_Terminate()
pDestroy
End Sub
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