LISP怎么获取图片的拍摄日期？

zark

可能会用到的函数或参数信息
http://www.codeproject.com/Articles/3803/Cexif

xujinhua

我也想知道啊

zark

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


Private Type PropertyItem
   propId                   As Long               ' ID of this property
   Length                   As Long               ' Length of the property value, in bytes
   Type                     As Long                 ' Type of the value, as one of TAG_TYPE_XXX  defined above
   Value                    As Long                ' property value
End Type


Private Declare Function GdiplusStartup Lib "gdiplus" (Token As Long, inputbuf As GdiplusStartupInput, Optional ByVal outputbuf As Long = 0) As Long
Private Declare Sub GdiplusShutdown Lib "gdiplus" (ByVal Token As Long)
Private Declare Function GdipLoadImageFromFile Lib "gdiplus" (ByVal FileName As Long, hImage As Long) As Long
Private Declare Function GdipDisposeImage Lib "gdiplus" (ByVal Image As Long) As Long

Private Declare Function GdipGetPropertyCount Lib "gdiplus" (ByVal Image As Long, numOfProperty As Long) As Long
Private Declare Function GdipGetPropertyIdList Lib "gdiplus" (ByVal Image As Long, ByVal numOfProperty As Long, list As Long) As Long
Private Declare Function GdipGetPropertyItemSize Lib "gdiplus" (ByVal Image As Long, ByVal propId As Long, Size As Long) As Long
Private Declare Function GdipGetPropertyItem Lib "gdiplus" (ByVal Image As Long, ByVal propId As Long, ByVal propSize As Long, Buffer As Long) As Long
Private Declare Function GdipGetPropertySize Lib "gdiplus" (ByVal Image As Long, totalBufferSize As Long, numProperties As Long) As Long
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (lpDst As Any, lpSrc As Any, ByVal ByteLength As Long)



Private Function GetPhotoDate(ImagePath As String) As String
    Dim Bitmap                  As Long
    Dim Token                   As Long
    Dim Index                   As Long
    Dim PropertyCount           As Long
    Dim ItemSize                As Long
    Dim Prop                    As PropertyItem
    Dim GdipInput               As GdiplusStartupInput
    Const PropertyTagExifDTOrig As Long = &H9003&                  ' Date & time of original

    GdipInput.GdiplusVersion = 1
    GdiplusStartup Token, GdipInput
    GdipLoadImageFromFile StrPtr(ImagePath), Bitmap
    GdipGetPropertyCount Bitmap, PropertyCount
    ReDim PropertyList(PropertyCount - 1) As Long
    GdipGetPropertyIdList Bitmap, PropertyCount, PropertyList(0)
    For Index = 0 To PropertyCount - 1
        GdipGetPropertyItemSize Bitmap, PropertyList(Index), ItemSize
        ReDim Buffer(ItemSize - 1) As Byte
        GdipGetPropertyItem Bitmap, PropertyList(Index), ItemSize, ByVal VarPtr(Buffer(0))
        CopyMemory Prop, ByVal VarPtr(Buffer(0)), Len(Prop)
        ReDim Data(ItemSize - 16) As Byte
        CopyMemory Data(0), ByVal Prop.Value, ItemSize - 16
        Select Case PropertyList(Index)
        Case PropertyTagExifDTOrig
            GetPhotoDate = StrConv(Data, vbUnicode)
        End Select
    Next
    GdipDisposeImage Bitmap
    GdiplusShutdown Token
End Function

这是网上查到的VB版，请高手转换为LISP咯