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VB抓屏保存为文件实现代码
作者：佚名  文章来源：不详  点击数  更新时间：2008/10/22 21:38:07  文章录入：杜斌  责任编辑：杜斌
　　下面是一个VB抓屏保存为文件的源文件，很不错的，有精力的可以参考一下。
　　保存在标准模块
　　Option Explicit
　　Public Type BITMAPFILEHEADER
　　　　bfType(0 To 1) As Byte
　　　　bfSize As Long
　　　　bfReserved1 As Integer
　　　　bfReserved2 As Integer
　　　　bfOffBits As Long
　　End Type
　　Public Type BITMAPINFOHEADER \'40 bytes
　　　　biSize As Long
　　　　biWidth As Long
　　　　biHeight As Long
　　　　biPlanes As Integer
　　　　biBitCount As Integer
　　　　biCompression As Long
　　　　biSizeImage As Long
　　　　biXPelsPerMeter As Long
　　　　biYPelsPerMeter As Long
　　　　biClrUsed As Long
　　　　biClrImportant As Long
　　End Type
　　Public Declare Function GetDC Lib \"user32\" (ByVal hwnd As Long) As Long
　　Public Declare Function CreateCompatibleDC Lib \"gdi32\" (ByVal hdc As Long) As Long
　　Public Declare Function CreateDIBSection Lib \"gdi32\" (ByVal hdc As Long, pBitmapInfo As BITMAPINFOHEADER, ByVal un As Long, lplpVoid As Long, ByVal handle As Long, ByVal dw 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 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 ReleaseDC Lib \"user32\" (ByVal hwnd As Long, ByVal hdc As Long) As Long
　　Public Declare Function DeleteObject Lib \"gdi32\" (ByVal hObject As Long) As Long
　　Public Declare Sub CopyMemory Lib \"kernel32\" Alias \"RtlMoveMemory\" (ByVal Destination As Long, ByVal Source As Long, ByVal Length As Long)
　　Public Const DIB_RGB_COLORS = 0
　　Public Const SRCCOPY = &HCC0020
　　\'
　　\'作者:money
　　\'Email:2258773@163.com
　　\'涵数功能:拷屏,保存为BMP文件
　　\'成功返回真
　　\'


　　Public Function CopyScreenToBMP(ByVal szfile As String) As Boolean
　　 Dim w As Long, h As Long
　　 Dim scrDC As Long
　　 Dim DIB As Long, m_DC As Long
　　 Dim BmpInfo As BITMAPINFOHEADER
　　 Dim BmpFileHead As BITMAPFILEHEADER
　　 Dim pData As Long
　　 Dim buff() As Byte
　　 Dim old As Long
　　 Dim L As Long
　　　　\'取屏幕 高宽
　　　　w = Screen.Width \\ 15
　　　　h = Screen.Height \\ 15
　　　　\'准备内存DC
　　　　m_DC = CreateCompatibleDC(0&)
　　　　If m_DC = 0 Then
　　　　CopyScreenToBMP = False
　　　　Exit Function
　　　　End If
　　　　\'填充DIB的BMP结构
　　　　With BmpInfo
　　　　.biBitCount = 24
　　　　.biPlanes = 1
　　　　.biHeight = h
　　　　.biWidth = w
　　　　.biSize = 40 \'本结构长度
　　　　End With
　　DIB = CreateDIBSection(m_DC, BmpInfo, DIB_RGB_COLORS, pData, 0, 0)
　　　　If DIB = 0 Then
　　　　DeleteDC m_DC
　　　　CopyScreenToBMP = False
　　　　Exit Function
　　　　End If
　　old = SelectObject(m_DC, DIB)
　　　　\'拷屏
　　　　scrDC = GetDC(0)
　　　　BitBlt m_DC, 0, 0, w, h, scrDC, 0, 0, SRCCOPY
　　\'补足4的倍数
　　　　L = (w * 3 + 3) And &H7FFFFFFC
　　　　L = L * h
　　　　\'分配内存
　　　　ReDim buff(1 To L) As Byte
　　\'取像素数据
　　　　CopyMemory VarPtr(buff(1)), pData, L
　　\'释放资源
　　　　SelectObject m_DC, old
　　　　DeleteObject DIB
　　　　DeleteDC m_DC
　　　　ReleaseDC 0, scrDC
　　　　\'填充BMPFILE
　　With BmpFileHead
　　　　\'BM标志
　　　　.bfType(0) = 66: .bfType(1) = 77
　　　　.bfSize = 54 + L \'本文件大小
　　　　.bfOffBits = 54 \'像素数据偏移地址
　　　　End With
　　\'写入文件
　　　　\'懒得声明变量，直接用 L 存放文件号
　　　　L = FreeFile()
　　　　Open szfile For Binary As L
　　　　\'写入文件头
　　　　Put L, 1, BmpFileHead
　　　　Put L, , BmpInfo
　　　　\'写入实际像素
　　　　Put L, , buff()
　　　　Close L
　　CopyScreenToBMP = True
　　End Function
　　\'
　　\'例程
　　Option Explicit
　　Private Sub cmdTest_Click()
　　 Dim OK As Boolean
　　　　OK = CopyScreenToBMP(\"c:\\test.bmp\")
　　　　If OK Then
　　　　Set Me.Picture = LoadPicture(\"c:\\test.bmp\")
　　　　Else
　　　　MsgBox \"CAO,拷屏失败了~\"
　　　　End If
　　End Sub
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