Asp组件高级入门与精通系列之一

核心提示：很久没有写这个系列了，最近一直在忙其他的东西高级的组件话题我们将讨论一些比较难实现的，Asp组件高级入门与精通系列之一，复杂的东西前段时间我写了一个龙卷风缩略图水印组件，感觉效果还不错，不用考虑 biBitCount As Integer '颜色位数 biComPRession As Long '指

很久没有写这个系列了，最近一直在忙其他的东西高级的组件话题我们将讨论一些比较难实现的，复杂的东西前段时间我写了一个龙卷风缩略图水印组件，感觉效果还不错，由于是vb写的，有一些难度，大家一起来看看这里有帖子：http://community.csdn.net/EXPert/topic/4115/4115767.xml?temp=.9513056功能如下：龙卷风缩略图水印组件1.0版
功能特点:
1.支持从bmp位图,jpeg,gif导入
2.仅支持生成jpeg格式
3.文字水印,支持自定义字体,旋转角度,颜色,字体宽度和高度
4.图片水印,支持透明度
5.暂时不支持直接将文件流写入浏览器
6.消耗系统资源少
7.每个例子都有具体的注释
龙卷风缩略图水印组件0.9版
功能特点：
1.仅仅支持从bmp位图导入
2.仅仅支持生成jpeg格式
3.消耗系统资源少版本历史
龙卷风缩略图水印组件1.0版
时间:2005-02-13
增加了对jpg,gif图像导入的支持
时间:2005-02-12
功能:增加了图片水印功能
时间:2005-02-11
功能:增加了文字水印功能龙卷风缩略图水印组件0.9版
时间:2005-02-10
功能:仅支持bmp位图导入功能,支持生成jpeg功能,只有缩略功能
可以免费使用，无任何限制
如有问题，希望提出，以便我改进
我的email:yyg19780718@163.com代码如下：模块1：Option Explicit
'有部分代码不需要，以后可能会用到Public Const LR_LOADFROMFILE = &H10
Public Const IMAGE_BITMAP = 0
Public Const IMAGE_ICON = 1
Public Const IMAGE_CURSOR = 2
Public Const IMAGE_ENHMETAFILE = 3Public Const SRCCOPY　　　　　 As Long = &HCC0020
Public Const BI_RGB = 0&
Public Const DIB_RGB_COLORS = 0 '结构BITMAPINFO中包含了RGB值的数组RGBQUAD
Public Const STRETCH_HALFTONE  As Long = &H4&Public Type BITMAPINFOHEADER '40 字节位图文件头
　　　  biSize As Long　　　　  '结构所需字节数
　　　  biWidth As Long　　　　 '图像宽度
　　　  biHeight As Long　　　  '图像高度
　　　  biplanes As Integer　　 '必须为1，不用考虑
　　　  biBitCount As Integer　 '颜色位数
　　　  biComPRession As Long　 '指定是否压缩,一般取BI_RGB
　　　  biSizeImage As Long　　 '实际的位图占据的字节数，＝biWidth'(必须是4的整数〕*biHeight
　　　  biXPelsPerMeter As Long '水平分辨率
　　　  biYPelsPerMeter As Long '垂直分辨率
　　　  biClrUsed As Long　　　 '本图像用到的实际实际颜色数
　　　  biClrImportant As Long  '本图像中重要的颜色数，为0，则认为所有的图像都是重要的
End Type
Public Type RGBQUAD
　　　  rgbBlue As Byte　　　　 '该颜色的蓝色分量
　　　  rgbGreen As Byte　　　  '该颜色的绿色分量
　　　  rgbRed As Byte　　　　  '该颜色的红色分量
　　　  rgbReserved As Byte　　 '保留值
End TypePublic Type Bitmap
　  bmType As Long
　  bmWidth As Long
　  bmHeight As Long
　  bmWidthBytes As Long
　  bmPlanes As Integer
　  bmBitsPixel As Integer
　  bmBits As Long
End TypePublic Type BitmapInfo
　　　  bmiHeader As BITMAPINFOHEADER
　　　  bmiColors As RGBQUAD
End TypePublic Type BITMAPFILEHEADER
　  bfType(1 To 2) As Byte
　  bfSize As Long
　  bfReserved1 As Integer
　  bfReserved2 As Integer
　  bfOffBits As Long
End Type
Public Declare Function CreateCompatibleDC Lib "gdi32" (ByVal hdc As Long) As Long
Public Declare Function CreateDIBSection Lib "gdi32" (ByVal hdc As Long, pBitmapInfo As BitmapInfo, ByVal un As Long, ByVal lplpVoid As Long, ByVal handle As Long, ByVal dw As Long) As Long
Public Declare Function GetDIBits Lib "gdi32" (ByVal aHDC As Long, ByVal hBitmap As Long, ByVal nStartScan As Long, ByVal nNumScans As Long, lpBits As Any, lpBI As BitmapInfo, ByVal wUsage As Long) As Long
Public Declare Function SetDIBitsToDevice Lib "gdi32" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long, ByVal dx As Long, ByVal dy As Long, ByVal SrcX As Long, ByVal SrcY As Long, ByVal Scan As Long, ByVal NumScans As Long, Bits As Any, BitsInfo As BitmapInfo, ByVal wUsage As Long) As Long
Public Declare Function SelectObject Lib "gdi32" (ByVal hdc As Long, ByVal hObject As Long) As Long
Public Declare Function DeleteDC Lib "gdi32" (ByVal hdc As Long) As Long
Public Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long
Public Declare Function BitBlt Lib "gdi32" (ByVal hDestDC As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal dwRop As Long) As Long
Public Declare Function GetDC Lib "user32" (ByVal hwnd As Long) As Long
Public Declare Function CreateCompatibleBitmap Lib "gdi32" (ByVal hdc As Long, ByVal nWidth As Long, ByVal nHeight As Long) As Long
Public Declare Function GetObject Lib "gdi32" Alias "GetObjectA" (ByVal hObject As Long, ByVal nCount As Long, lpObject As Any) As Long
Public Declare Function LoadImage Lib "user32" Alias "LoadImageA" (ByVal hInst As Long, ByVal lpsz As String, ByVal dwImageType As Long, ByVal dwDesiredWidth As Long, ByVal dwDesiredHeight As Long, ByVal dwFlags As Long) As Long
Public Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, ByVal Length As Long)
Public Declare Function StretchBlt Lib "gdi32" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal nSrcWidth As Long, ByVal nSrcHeight As Long, ByVal dwRop As Long) As Long
Public Declare Function SetStretchBltMode Lib "gdi32" (ByVal hdc As Long, ByVal nStretchMode As Long) As Long
模块2：Option Explicit'以下是输出文字水印的api
Public Declare Function TextOut Lib "gdi32" Alias "TextOutA" (ByVal hdc As Long, ByVal x As Long, ByVal y As Long, ByVal lpString As String, ByVal nCount As Long) As Long
Public Declare Function SetBkMode Lib "gdi32" (ByVal hdc As Long, ByVal nBkMode As Long) As Long
Public Declare Function SetTextColor Lib "gdi32" (ByVal hdc As Long, ByVal crColor As Long) As Long
Public Declare Function CreateFontIndirect Lib "gdi32" Alias "CreateFontIndirectA" (lpLogFont As LOGFONT) As LongPublic Const LF_FACESIZE = 32
Public Const TRANSPARENT = 1
'逻辑字体结构
Public Type LOGFONT
　  lfHeight As Long
　  lfWidth As Long
　  lfEscapement As Long
　  lfOrientation As Long
　  lfWeight As Long
　  lfItalic As Byte
　  lfUnderline As Byte
　  lfStrikeOut As Byte
　  lfCharSet As Byte
　  lfOutPrecision As Byte
　  lfClipPrecision As Byte
　  lfQuality As Byte
　  lfPitchAndFamily As Byte
　  lfFaceName As String * LF_FACESIZE
End Type'图片水印透明处理
Public Declare Function AlphaBlend Lib "MSIMG32.dll" ( _
  ByVal hdcDest As Long, _
  ByVal nXOriginDest As Long, _
  ByVal nYOriginDest As Long, _
  ByVal nWidthDest As Long, _
  ByVal nHeightDest As Long, _
  ByVal hdcSrc As Long, _
  ByVal nXOriginSrc As Long, _
  ByVal nYOriginSrc As Long, _
  ByVal nWidthSrc As Long, _
  ByVal nHeightSrc As Long, _
  ByVal lBlendFunction As Long _
) As LongPublic Type BLENDFUNCTION
  BlendOp As Byte
  BlendFlags As Byte
  SourceConstantAlpha As Byte
  AlphaFormat As Byte
End Type
' BlendOp:
Public Const AC_SRC_OVER = &H0
' AlphaFormat:
Public Const AC_SRC_ALPHA = &H1
模块3Option Explicit'以下是GDI+的声明
Public Type GUID
　 Data1 As Long
　 Data2 As Integer
　 Data3 As Integer
　 Data4(0 To 7) As Byte
End TypePublic Type GdiplusStartupInput
　 GdiplusVersion As Long
　 DebugEventCallback As Long
　 SuppressBackgroundThread As Long
　 SuppressExternalCodecs As Long
End TypePublic Type EncoderParameter
　 GUID As GUID
　 NumberOfValues As Long
　 type As Long
　 Value As Long
End TypePublic Type EncoderParameters
　 Count As Long
　 Parameter As EncoderParameter
End TypePublic Declare Function GdiplusStartup Lib "GDIPlus" (token As Long, inputbuf As GdiplusStartupInput, Optional ByVal outputbuf As Long = 0) As Long
Public Declare Function GdiplusShutdown Lib "GDIPlus" (ByVal token As Long) As Long
Public Declare Function GdipCreateBitmapFromHBITMAP Lib "GDIPlus" (ByVal hbm As Long, ByVal hpal As Long, Bitmap As Long) As Long
Public Declare Function GdipDisposeImage Lib "GDIPlus" (ByVal Image As Long) As Long
Public Declare Function GdipSaveImageToFile Lib "GDIPlus" (ByVal Image As Long, ByVal filename As Long, clsidEncoder As GUID, encoderParams As Any) As Long
Public Declare Function GdipSaveImageToStream Lib "GDIPlus" (ByVal Image As Long, ByVal stream As Long, clsidEncoder As GUID, encoderParams As Any) As Long
Public Declare Function CLSIDFromString Lib "ole32" (ByVal str As Long, id As GUID) As Long
'保存成jpeg格式
Public Sub SaveJPG(ByVal pict As Long, ByVal filename As String, Optional ByVal quality As Byte = 100)
Dim tSI As GdiplusStartupInput
Dim lRes As Long
Dim lGDIP As Long
Dim lBitmap As Long　 ' Initialize GDI+
　 tSI.GdiplusVersion = 1
　 lRes = GdiplusStartup(lGDIP, tSI)
　
　 If lRes = 0 Then
　
　　  ' Create the GDI+ bitmap
　　  ' from the image handle
　　  lRes = GdipCreateBitmapFromHBITMAP(pict, 0, lBitmap)
　
　　  If lRes = 0 Then
　　　　 Dim tJpgEncoder As GUID
　　　　 Dim tParams As EncoderParameters
　　　　
　　　　 ' Initialize the encoder GUID
　　　　 CLSIDFromString StrPtr("{557CF401-1A04-11D3-9A73-0000F81EF32E}"), _
　　　　　　　　　　　　 tJpgEncoder
　　 
　　　　 ' Initialize the encoder parameters
　　　　 tParams.Count = 1
　　　　 With tParams.Parameter ' Quality
　　　　　  ' Set the Quality GUID
　　　　　  CLSIDFromString StrPtr("{1D5BE4B5-FA4A-452D-9CDD-5DB3505E7EB}"), .GUID
　　　　　  .NumberOfValues = 1
　　　　　  .type = 1
　　　　　  .Value = VarPtr(quality)
　　　　 End With
　　　　
　　　　 ' Save the image
　　　　 lRes = GdipSaveImageToFile(lBitmap, StrPtr(filename), tJpgEncoder, tParams)
　　　　　　　　　　　　　　
　　　　 ' Destroy the bitmap
　　　　 GdipDisposeImage lBitmap
　　　　
　　  End If
　　 
　　  ' Shutdown GDI+
　　  GdiplusShutdown lGDIP
　 End If
　
　 If lRes Then
　　  Err.Raise vbObjectError + 515, , "保存图像发生了错误,错误号:" & lRes
　 End If
　
End Sub