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vb或VBA進行StdPicture、IStream、Byte() 互轉

2020-04-30 08:00:00
TZWSOHO
轉貼
103
模塊代碼:
Option Explicit

'*********************************************************************************
'StdPicture、IStream、Byte() 互轉
'作者:TZWSOHO
'
'蔘考瞭魏滔序的《VB6 結閤 GDI+ 實現內存(Stream)壓縮/解壓縮 JPG 圖像》
'非常感謝魏滔序的代碼!!!
 
'*********************************************************************************

Private Const GMEM_MOVEABLE As Long = &H2

'常量聲明
Private Const ClsidJPEG As String = "{557CF401-1A04-11D3-9A73-0000F81EF32E}"
Private Const EncoderParameterValueTypeLong As Long = 4&
Private Const EncoderQuality As String = "{1D5BE4B5-FA4A-452D-9CDD-5DB35105E7EB}"
Private Const GdiPlusVersion As Long = 1&

'結構聲明
Private Type GUID
    Data1 As Long
    Data2 As Integer
    Data3 As Integer
    Data4(0 To 7) As Byte
End Type

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

Private Type PICTDESC
    cbSizeOfStruct As Long
    picType As Long
    hgdiObj As Long
    hPalOrXYExt As Long
End Type

Private Type EncoderParameter
    GUID As GUID
    NumberOfValues As Long
    Type As Long
    Value As Long
End Type

Private Type EncoderParameters
    Count As Long
    Parameter(15) As EncoderParameter
End Type

Private Type GDIPlusStartupInput
    GdiPlusVersion As Long
    DebugEventCallback As Long
    SuppressBackgroundThreadAs Long
    SuppressExternalCodecs As Long
End Type

Private Type GdiplusStartupOutput
    NotificationHook As Long
    NotificationUnhook As Long
End Type

'枚舉聲明
Private Enum Status
    OK = 0
    GenericError = 1
    InvalidParameter = 2
    OutOfMemory = 3
    ObjectBusy = 4
    InsufficientBuffer = 5
    NotImplemented = 6
    Win32Error = 7
    WrongState = 8
    Aborted = 9
    FileNotFound = 10
    ValueOverflow = 11
    AccessDenied = 12
    UnknownImageFormat = 13
    FontFamilyNotFound = 14
    FontStyleNotFound = 15
    NotTrueTypeFont = 16
    UnsupportedGdiplusVersion = 17
    GdiplusNotInitialized = 18
    PropertyNotFound = 19
    PropertyNotSupported = 20
    ProfileNotFound = 21
End Enum

'API聲明
Private Declare Function GdipCreateBitmapFromHBITMAP Lib "gdiplus" (ByVal hbm As Long, ByVal hpal As Long, ByRef bitmap As Long) As Status
Private Declare Function GdipCreateHBITMAPFromBitmap Lib "gdiplus" (ByVal bitmap As Long, ByRef hbmReturn As Long, ByVal Background As Long) As Status
Private Declare Function GdipDisposeImage Lib "gdiplus" (ByVal image As Long) As Status
Private Declare Function GdipLoadImageFromStream Lib "gdiplus" (ByVal Stream As IStream, ByRef image As Long) As Status
Private Declare Function GdiplusShutdown Lib "gdiplus" (ByVal token As Long) As Status
Private Declare Function GdiplusStartup Lib "gdiplus" (ByRef token As Long, ByRef lpInput As GDIPlusStartupInput, ByRef lpOutput As GdiplusStartupOutput) As Status
Private Declare Function GdipSaveImageToStream Lib "gdiplus" (ByVal image As Long, ByVal Stream As IStream, ByRef clsidEncoder As GUID, ByRef encoderParams As Any) As Status
Private Declare Function CLSIDFromString Lib "ole32" (ByVal Str As Long, ByRef id As GUID) As Long
Private Declare Function CreateStreamOnHGlobal Lib "ole32.dll" (ByRef hGlobal As Any, ByVal fDeleteOnRelease As Long, ByRef ppstm As Any) As Long
Private Declare Sub OleCreatePictureIndirect Lib "oleaut32.dll" (ByRef lpPictDesc As PICTDESC, ByRef riid As IID, ByVal fOwn As Boolean, ByRef lplpvObj As Object)

Private Declare Sub CopyMemory Lib "kernel32.dll" Alias "RtlMoveMemory" (ByRef Destination As Any, ByRef Source As Any, ByVal Length As Long)

Private Declare Function GlobalAlloc Lib "kernel32.dll" (ByVal wFlags As Long, ByVal dwBytes As Long) As Long
Private Declare Function GlobalLock Lib "kernel32.dll" (ByVal hMem As Long) As Long
'Private Declare Function GlobalSize Lib "kernel32.dll" (ByVal hMem As Long) As Long
Private Declare Function GlobalUnlock Lib "kernel32.dll" (ByVal hMem As Long) As Long
Private Declare Function GlobalFree Lib "kernel32.dll" (ByVal hMem As Long) As Long
'Private Declare Function GetHGlobalFromStream Lib "ole32.dll" (ByVal pstm As IStream, ByRef phglobal As Long) As Long

'By Modest
'根據版本初始化GDI+
Private Function StartUpGDIPlus(ByVal GdipVersion As Long) As Long
    Dim GdipToken As Long
    Dim GdipStartupInput As GDIPlusStartupInput
    Dim GdipStartupOutput As GdiplusStartupOutput
   GdipStartupInput.GdiPlusVersion = GdipVersion
    If GdiplusStartup(GdipToken, GdipStartupInput, GdipStartupOutput) = OK Then
       StartUpGDIPlus = GdipToken
    End If
End Function

'By Modest
'從圖像轉換爲流
Public Function PictureToStream(ByVal Picture As StdPicture, Optional ByVal JpegQuality As Long = 85) As IStream
    Dim picStream As IStream
    Dim lBitmap As Long
    Dim tGUID As GUID
    Dim bytBuff() As Byte
    Dim tParams As EncoderParameters
    Dim lngGdipToken As Long

    lngGdipToken = StartUpGDIPlus(GdiPlusVersion)

    '檢查JPG壓縮比率
    If JpegQuality > 100 Then JpegQuality = 100
    If JpegQuality < 0 Then JpegQuality = 0

    '創建Bitmap
    If GdipCreateBitmapFromHBITMAP(Picture.Handle, 0, lBitmap) = OK Then
       '創建Stream
       If CreateStreamOnHGlobal(ByVal 0&, False, picStream) = 0 Then
          '轉換GUID
           If CLSIDFromString(StrPtr(ClsidJPEG), tGUID) = 0 Then
              '設置JPG相關蔘數值
              tParams.Count = 1
              With tParams.Parameter(0)
                 CLSIDFromString StrPtr(EncoderQuality), .GUID
                 .NumberOfValues = 1
                 .Type = EncoderParameterValueTypeLong
                 .Value = VarPtr(JpegQuality)
              End With
              '將Bitmap數據保存到流(JPG格式)
              If GdipSaveImageToStream(lBitmap, picStream, tGUID, tParams) = OK Then
                 Set PictureToStream = picStream
              End If
           End If
           Set picStream = Nothing
       End If
    End If
    GdipDisposeImage lBitmap
    GdiplusShutdown lngGdipToken
End Function

'By Modest
'從流轉換爲圖像
Public Function StreamToPicture(ByVal Stream As IStream) As StdPicture
    Dim picStream As IStream
    Dim lBitmap As Long
    Dim hBitmap As Long
    Dim lngGdipToken As Long
    Dim tPictDesc As PICTDESC
    Dim IID_IPicture As IID
    Dim oPicture As IPicture

    lngGdipToken = StartUpGDIPlus(GdiPlusVersion)

    Set picStream = Stream
    '從Stream加載Bitmap
    If GdipLoadImageFromStream(picStream, lBitmap) = OK Then
       '根據Bitmap創建hBitbmp
       If GdipCreateHBITMAPFromBitmap(lBitmap, hBitmap, 0) = OK Then
           With tPictDesc
              .cbSizeOfStruct = Len(tPictDesc)
              .picType = vbPicTypeBitmap
              .hgdiObj = hBitmap
              .hPalOrXYExt = 0
           End With

           ' 初始化IPicture
           With IID_IPicture
              .Data1 = &H7BF80981
              .Data2 = &HBF32
              .Data3 = &H101A
              .Data4(0) = &H8B
              .Data4(1) = &HBB
              .Data4(3) = &HAA
              .Data4(5) = &H30
              .Data4(6) = &HC
              .Data4(7) = &HAB
           End With

           Call OleCreatePictureIndirect(tPictDesc, IID_IPicture, True, oPicture)
           Set StreamToPicture = oPicture
       End If
    End If

    Set picStream = Nothing
    GdipDisposeImage lBitmap
    GdiplusShutdown lngGdipToken
End Function

'By TZWSOHO
'從圖像轉換爲流再轉爲字節數組
Public Function PictureToByteArray(ByVal Picture As StdPicture, Optional ByVal JpegQuality As Long = 85) As Byte()
    Dim picStream As IStream
    Dim lBitmap As Long
    Dim tGUID As GUID
    Dim bytBuff() As Byte
    Dim tParams As EncoderParameters
    Dim lngGdipToken As Long

    Dim hGlobal As Long, lpBuffer As Long, dwSize As Long, Buff() As Byte

    lngGdipToken = StartUpGDIPlus(GdiPlusVersion)

    '檢查JPG壓縮比率
    If JpegQuality > 100 Then JpegQuality = 100
    If JpegQuality < 0 Then JpegQuality = 0

    '創建Bitmap
    If GdipCreateBitmapFromHBITMAP(Picture.Handle, 0, lBitmap) = OK Then
       hGlobal = GlobalAlloc(GMEM_MOVEABLE, Picture.Width * Picture.Height 256) '創建緩衝區
       '創建Stream
       If CreateStreamOnHGlobal(ByVal hGlobal, False, picStream) = 0 Then
          '轉換GUID
           If CLSIDFromString(StrPtr(ClsidJPEG), tGUID) = 0 Then
              '設置JPG相關蔘數值
              tParams.Count = 1
              With tParams.Parameter(0)
                 CLSIDFromString StrPtr(EncoderQuality), .GUID
                 .NumberOfValues = 1
                 .Type = EncoderParameterValueTypeLong
                 .Value = VarPtr(JpegQuality)
              End With
              '將Bitmap數據保存到流(JPG格式)
              If GdipSaveImageToStream(lBitmap, picStream, tGUID, tParams) = OK Then
                 'GetHGlobalFromStream picStream, hGlobal

                 picStream.Seek 0, STREAM_SEEK_CUR, dwSize '穫取圖像大小
                 lpBuffer = GlobalLock(hGlobal) '穫取緩衝區讀寫指針
                 ReDim Buff(dwSize - 1): CopyMemory Buff(0), ByVal lpBuffer, dwSize '讀取圖像
                 GlobalUnlock hGlobal: GlobalFree hGlobal '釋放分配的緩衝區空間
                 PictureToByteArray = Buff
              End If
           End If
           Set picStream = Nothing
       End If
    End If
    GdipDisposeImage lBitmap
    GdiplusShutdown lngGdipToken
End Function

'By TZWSOHO
'從字節數組轉換爲流再轉換爲圖像
Public Function ByteArrayToPicture(sBuf() As Byte) As StdPicture
    Dim picStream As IStream
    Dim lBitmap As Long
    Dim hBitmap As Long
    Dim lngGdipToken As Long
    Dim tPictDesc As PICTDESC
    Dim IID_IPicture As IID
    Dim oPicture As IPicture
    Dim hGlobal As Long, lpBuffer As Long

    lngGdipToken = StartUpGDIPlus(GdiPlusVersion)

    hGlobal = GlobalAlloc(GMEM_MOVEABLE, UBound(sBuf) + 1) '創建緩衝區
    lpBuffer = GlobalLock(hGlobal) '穫取緩衝區讀寫指針
    CopyMemory ByVal lpBuffer, sBuf(0), UBound(sBuf) + 1 '複製字節數組內容到緩衝區
    '創建Stream
    If CreateStreamOnHGlobal(ByVal hGlobal, False, picStream) = 0 Then
       '從Stream加載Bitmap
       If GdipLoadImageFromStream(picStream, lBitmap) = OK Then
          '根據Bitmap創建hBitbmp
           If GdipCreateHBITMAPFromBitmap(lBitmap, hBitmap, 0) = OK Then
              With tPictDesc
                 .cbSizeOfStruct = Len(tPictDesc)
                 .picType = vbPicTypeBitmap
                 .hgdiObj = hBitmap
                 .hPalOrXYExt = 0
              End With

              ' 初始化IPicture
              With IID_IPicture
                 .Data1 = &H7BF80981
                 .Data2 = &HBF32
                 .Data3 = &H101A
                 .Data4(0) = &H8B
                 .Data4(1) = &HBB
                 .Data4(3) = &HAA
                 .Data4(5) = &H30
                 .Data4(6) = &HC
                 .Data4(7) = &HAB
              End With

              Call OleCreatePictureIndirect(tPictDesc, IID_IPicture, True, oPicture)
              Set ByteArrayToPicture = StreamToPicture(picStream)
           End If
       End If
       GlobalUnlock hGlobal: GlobalFree hGlobal '釋放分配的緩衝區空間
       Set picStream = Nothing
    End If
    GdipDisposeImage lBitmap
    GdiplusShutdown lngGdipToken
End Function

窗體代碼:
Option Explicit
'StdPicture、IStream、Byte() 互轉示例
Private Sub Command1_Click()

    'By Modest
    'Dim s As IStream
    'Set s = PictureToStream(Picture1.Picture, 5)
    'Set Picture2.Picture = StreamToPicture(s)

    'By TZWSOHO
    Dim Buf() As Byte
    Buf = PictureToByteArray(Picture1.Picture, 5)
    Set Picture2.Picture = ByteArrayToPicture(Buf)
End Sub

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