Question

vb6如何使用png图片

因为转化为gif，图片效果不好，，，，，我用ps做了一个按钮，想用mousemove事件，，，
有没有什么控件可以直接用的，，，，

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Answer 1

Private Declare Function GetSysColor Lib "user32" (ByVal nIndex As Long) As Long
Private Sub Form_Load()
Dim Token As Long
Dim C As Long

C = Me.BackColor

If C < 0 Then C = GetSysColor(C - &H80000000)

Token = InitGDIPlus

Picture1(0).Picture = LoadPictureGDIPlus(App.Path & "\1.png", , , vbWhite)
Picture1(1).Picture = LoadPictureGDIPlus(App.Path & "\1.png", , , vbCyan)
Picture1(2).Picture = LoadPictureGDIPlus(App.Path & "\1.png", , , vbGreen)
Picture1(3).Picture = LoadPictureGDIPlus(App.Path & "\1.png", , , C)
Image1.Picture = LoadPictureGDIPlus(App.Path & "\1.png", , , C)
FreeGDIPlus Token
End Sub

Answer 2

Option Explicit
Private Type GUID
Data1 As Long
Data2 As Integer
Data3 As Integer
Data4(0 To 7) As Byte
End Type

Private Type PICTDESC
Size As Long
Type As Long
hPic As Long
hPal As Long
End Type

Private Type GdiplusStartupInput
GdiplusVersion As Long
DebugEventCallback As Long
SuppressBackgroundThread As Long
SuppressExternalCodecs As Long
End Type

Private Declare Function GdiplusStartup Lib "GDIPlus" (token As Long, _
inputbuf As GdiplusStartupInput, Optional ByVal outputbuf As Long = 0) As Long
Private Declare Function GdipCreateBitmapFromFile Lib "GDIPlus" (ByVal filename As Long, bitmap As Long) As Long
Private Declare Function GdipCreateHBITMAPFromBitmap Lib "GDIPlus" (ByVal bitmap As Long, _
hbmReturn As Long, ByVal background As Long) As Long
Private Declare Function GdipDisposeImage Lib "GDIPlus" (ByVal image As Long) As Long
Private Declare Function GdiplusShutdown Lib "GDIPlus" (ByVal token As Long) As Long
Private Declare Function OleCreatePictureIndirect Lib "olepro32.dll" (PicDesc As PICTDESC, _
RefIID As GUID, ByVal fPictureOwnsHandle As Long, IPic As IPicture) As Long

Public Function LoadImage(ByVal strFName As String) As IPicture
Dim uGdiInput As GdiplusStartupInput
Dim hGdiPlus As Long
Dim hGdiImage As Long
Dim hBitmap As Long

uGdiInput.GdiplusVersion = 1

If GdiplusStartup(hGdiPlus, uGdiInput) = 0 Then
If GdipCreateBitmapFromFile(StrPtr(strFName), hGdiImage) = 0 Then
GdipCreateHBITMAPFromBitmap hGdiImage, hBitmap, 0
Set LoadImage = ConvertToIPicture(hBitmap)
GdipDisposeImage hGdiImage
End If
GdiplusShutdown hGdiPlus
End If

End Function

Public Function ConvertToIPicture(ByVal hPic As Long) As IPicture

Dim uPicInfo As PICTDESC
Dim IID_IDispatch As GUID
Dim IPic As IPicture

Const PICTYPE_BITMAP = 1

With IID_IDispatch
.Data1 = &H7BF80980
.Data2 = &HBF32
.Data3 = &H101A
.Data4(0) = &H8B
.Data4(1) = &HBB
.Data4(2) = &H0
.Data4(3) = &HAA
.Data4(4) = &H0
.Data4(5) = &H30
.Data4(6) = &HC
.Data4(7) = &HAB
End With

With uPicInfo
.Size = Len(uPicInfo)
.Type = PICTYPE_BITMAP
.hPic = hPic
.hPal = 0
End With

OleCreatePictureIndirect uPicInfo, IID_IDispatch, True, IPic

Set ConvertToIPicture = IPic
End Function