图象转换下

图象转换下

´**********************************************************************
´* 刷新 PictureBox 控件的 Picture 对象。对PictureBox中的任何绘图操作，
´*　　　　　　　　　　　　　　　　　 通过它即可转换为Picture对象
´* 使用该函数可将PictureBox内的图象编辑结果永久更新为 Picture 对象
´* 参数∶ PicBox PictureBox控件名
´*　　　　　　　　lWidth 需要更新的图象宽度(按你的需要，不局限于目前Picture对
´*　　　　　　　　　　　　　　 象的实际大小)，也是最后要形成的Picture对象的图象宽度(单位∶像素)
´*　　　　　　　　lHeight 需要更新的图象高度，其他类同与 lWidth(单位∶像素)
´**********************************************************************
Function UpdatePicture(ByRef PicBox As Object, Optional ByVal lWidth As Long = -1, _
　　　　　　　　　　　 Optional ByVal lHeight As Long = -1) As Boolean
　
　On Error GoTo errHandle

　　Dim oldScMode As Integer
　　Dim hNewDC As Long
　　Dim hOldBit As Long
　　Dim hNewBit As Long

　　oldScMode = -1
　　oldScMode = PicBox.ScaleMode
　　If lWidth = -1 Then
　　　　lWidth = PicBox.ScaleX(PicBox.Picture.Width, 8, vbPixels)
　　End If
　　If lHeight = -1 Then
　　　　lHeight = PicBox.ScaleY(PicBox.Picture.Height, 8, vbPixels)
　　End If

　　hNewDC = CreateCompatibleDC(PicBox.hdc)
　　hNewBit = CreateCompatibleBitmap(PicBox.hdc, lWidth, lHeight)
　　hOldBit = SelectObject(hNewDC, hNewBit)

　　BitBlt hNewDC, 0, 0, lWidth, lHeight, PicBox.hdc, 0, 0, vbSrcCopy
　　SelectObject hNewDC, hOldBit

　　PicBox.Picture = BitmapToPicture(hNewBit)

　　DeleteObject hNewDC
　　DeleteDC hNewDC
　　If oldScMode <> -1 Then PicBox.ScaleMode = oldScMode
　　UpdatePicture = True

　　Exit Function
errHandle:
　　UpdatePicture = False
　　If oldScMode <> -1 Then PicBox.ScaleMode = oldScMode
End Function
有关的API函数声明

Option Explicit

Public Const hNull = 0

Public Type IID
　　 Data1 As Long
　　 Data2 As Integer
　　 Data3 As Integer
　　 Data4(0 To 7) As Byte
End Type

Public Type PICTDESC
　　cbSizeofstruct As Long
　　picType As Long
　　hgdiobj As Long
　　hPalOrXYExt As Long
End Type

Public Declare Sub OleCreatePictureIndirect Lib "olepro32.dll" ( _
　　lpPictDesc As PICTDESC, _
　　riid As IID, _
　　ByVal fPictureOwnsHandle As Long, _
　　ipic As IPicture)
Public Declare Function CreateCompatibleDC& Lib "gdi32" (ByVal hdc As Long)
Public Declare Function CreateCompatibleBitmap& Lib "gdi32" ( _
　　ByVal hdc As Long, _
　　ByVal nWidth As Long, _
　　ByVal nHeight As Long)
Public Declare Function DeleteDC& Lib "gdi32" (ByVal hdc As Long)
Public Declare Function SelectObject& Lib "gdi32" ( _
　　ByVal hdc As Long, _
　　ByVal hObject As Long)
Public Declare Function DeleteObject& Lib "gdi32" (ByVal hObject As Long)

       以上代码来自： 源代码数据库(SourceDataBase)
           当前版本： 1.0.436
               作者： Shawls
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