VB 使用PNG透明格式的图片其实是非常容易的,那就是使用XP以上操作系统中的GDI+库:
需要生命的GDI+的函数:
Private Declare Function GdiplusStartup Lib "gdiplus.dll" ( _
ByRef token As Long, _
ByRef inputX As GdiplusStartupInput, _
ByVal Output As Long _
) As Status
Private Declare Sub GdiplusShutdown Lib "gdiplus.dll" (ByVal token As Long)
Private Declare Function GdipCreateFromHDC Lib "gdiplus.dll" ( _
ByVal hdc As Long, ByRef graphics As Long _
) As Status
Private Declare Function GdipDrawImage Lib "gdiplus.dll" ( _
ByVal graphics As Long, ByVal Image As Long, _
ByVal X As Single, ByVal Y As Single _
) As Status
Private Declare Function GdipLoadImageFromFile Lib "gdiplus.dll" ( _
ByVal FileName As Long, ByRef Image As Long _
) As Status
Private Declare Function GdipDisposeImage Lib "gdiplus.dll" _
(ByVal Image As Long) As Status
需要声明的结构:
Private Type GdiplusStartupInput
GdiplusVersion As Long
DebugEventCallback As Long
SuppressBackgroundThread As Long
SuppressExternalCodecs As Long
End Type
具体做法如下:
Dim m_lngGraphics as long
Dim m_lngInstance as long
Dim m_lngPic as long
Private Sub Form_Load() 'GDI+初始化
Dim udtData As GdiplusStartupInput
Randomize
udtData.GdiplusVersion = 1
If GdiplusStartup(app.hInstance, udtData, 0) Then
MsgBox "GDI+ could not be initialized", vbCritical
Exit Sub
End If
If GdipCreateFromHDC(Me.hdc, m_lngGraphics) Then
MsgBox "Graphics object could not be created", vbCritical
Exit Sub
End If
GdipLoadimagefromfile "c:\1.png" , m_lngPic
GdipImageDraw m_lngGraphics,m_lngPic
End Sub