PB从剪贴板取图并保存

结构体定义

 type bitmapinfoheader from structure
     long bisize
     long biwidth
     long biheight
     integer biplanes
     integer bibitcount
     long bicompression
     long bisizeimage
     long bixpelspermeter
     long biypelspermeter
     long biclrused
     long biclrimportant
 end type

 type bitmapfileheader from structure
     integer bftype
     long bfsize
     integer bfreserved1
     integer bfreserved2
     long bfoffbits
 end type

 type bitmapinfo from structure
     bitmapinfoheader bmiheader
     unsignedlong bmicolors[]
 end type

API定义

 FUNCTION Boolean OpenClipboard(ULong hWndNewOwner) LIBRARY "user32.dll"
 FUNCTION Boolean CloseClipboard() LIBRARY "user32.dll"
 FUNCTION ULong GetClipboardData(ulong wFormat) LIBRARY "user32.dll"
 FUNCTION ulong IsClipboardFormatAvailable(ulong wFormat) LIBRARY "user32.dll"
 FUNCTION ULong GetDesktopWindow() LIBRARY "user32.dll"
 FUNCTION ULong GetDC(ULong hWnd) LIBRARY "user32.dll"
 FUNCTION ULong CreateCompatibleDC(ULong hdc) LIBRARY "gdi32.dll"
 FUNCTION ULong SelectObject(ULong hdc,ULong hgdiobj) LIBRARY "gdi32.dll"
 FUNCTION Int GetDIBits(ULong hdc,ULong hbmp,UInt uStartScan,UInt cScanLines,REF Blob lpvBits,REF bitmapinfo lpbi,UInt uUsage) LIBRARY "gdi32.dll"
 FUNCTION Int GetDIBits(ULong hdc,ULong hbmp,UInt uStartScan,UInt cScanLines, ULong lpvBits, REF bitmapinfo lpbi, UInt uUsage) LIBRARY "gdi32.dll"
 SUBROUTINE CopyBitmapFileHeader(REF Blob Destination, bitmapfileheader Source,Long Length) LIBRARY "kernel32.dll" ALIAS FOR "RtlMoveMemory"
 SUBROUTINE CopyBitmapInfo(REF Blob Destination, bitmapinfo Source,Long Length) LIBRARY "kernel32.dll" ALIAS FOR "RtlMoveMemory"
 FUNCTION Boolean DeleteDC(ULong hdc) LIBRARY "gdi32.dll"
 FUNCTION Int ReleaseDC(ULong hWnd,ULong hdc) LIBRARY "user32.dll"
 FUNCTION ULong CreateFile(String lpFileName, ULong dwDesiredAccess, ULong dwShareMode, ULong lpSecurityAttributes, ULong dwCreationDisposition, &
 ULong dwFlagsAndAttributes, ULong hTemplateFile ) LIBRARY "kernel32.dll" ALIAS FOR "CreateFileA"
 FUNCTION Boolean WriteFile(ULong hFile,Blob lpBuffer,ULong nNumberOfBytesToWrite,REF ULong lpNumberOfBytesWritten, &
 ULong lpOverlapped) LIBRARY "kernel32.dll"
 FUNCTION Boolean CloseHandle(ULong hObject) LIBRARY "kernel32.dll"

函数调用

 long lul_hBitmap
 ulong lul_hdcmem, hdc
 //判断剪贴板中的数据是否是BMP数据
 constant ulong CF_BITMAP = 2
 constant ulong DIB_RGB_COLORS = 0
 constant ulong BITMAPTYPE = 19778
 if IsClipboardFormatAvailable(CF_BITMAP) <> 1 then return
 //（1）开始从剪贴板取数据
 OpenClipboard(GetDesktopWindow())
 lul_hBitmap = GetClipBoardData(CF_BITMAP)
 CloseClipboard()
 blob lb
 hdc = GetDC(GetDesktopWindow())
 lul_hdcmem = CreateCompatibleDC(hdc)
 selectobject(lul_hdcmem, lul_hBitmap)
 //（2）将取得的内存图片转换位blob数据流
 ULong lul_hdc, lul_pixels
 Blob lblb_header, lblb_info, lblb_bitmap
 BitmapInfo lstr_Info
 BitmapFileHeader lstr_Header
 IF lul_hBitmap = 0 THEN return
 lstr_Info.bmiHeader.biSize = 40
 IF GetDIBits(lul_hdcMem, lul_hBitmap, 0, 0, 0, lstr_Info, DIB_RGB_COLORS) <= 0 THEN return
 lul_pixels = lstr_Info.bmiHeader.biBitCount
 lstr_Info.bmiColors[lul_pixels] = 0
 lblb_bitmap = Blob(Space(lstr_Info.bmiHeader.biSizeImage))
 // 获取文件信息
 GetDIBits(lul_hdcMem, lul_hBitmap, 0, lstr_Info.bmiHeader.biheight, &
 lblb_bitmap, lstr_Info, DIB_RGB_COLORS)
 // 创建BMP文件头
 lstr_Header.bfType = BITMAPTYPE
 lstr_Header.bfSize = lstr_Info.bmiHeader.biSizeImage
 lstr_Header.bfOffBits = 54 + (lul_pixels * 4)
 // 将文件头转换成blob
 lblb_header = Blob(Space(14))
 CopyBitmapFileHeader(lblb_header, lstr_Header, 14)
 // 将文件内容转换为blob
 lblb_info = Blob(Space(40 + lul_pixels * 4))
 CopyBitmapInfo(lblb_info, lstr_Info, 40 + lul_pixels * 4)
 // 整合文件信息
 lblb_bitmap = lblb_header + lblb_info + lblb_bitmap
 //释放通过GetDC或GetWindowDC所检索出来的公用上下文设备
 ReleaseDC(GetDesktopWindow(),hdc)
 //删除通过CreteDC或CreateCompatibleDC所创建的上下文设备
 DeleteDC(lul_hdcmem)

 //（3）取到图片文件后，则开始保存到文件中
 if len(lblb_bitmap) <= 0 then  return
 CONSTANT ULong INVALID_HANDLE_VALUE = -1
 CONSTANT ULong GENERIC_WRITE = 1073741824
 CONSTANT ULong FILE_SHARE_WRITE = 2
 CONSTANT ULong CREATE_ALWAYS = 2
 ULong lul_file, lul_length, lul_written
 Boolean lb_rtn
 // (创建)打开文件

 string ls_path, ls_file
 int li_rc
 li_rc = GetFileSaveName ( "Select BMP File",  ls_path, ls_file, "bmp",  "bmp Files (*.bmp),*.bmp" , "D:\",  32770)

 IF li_rc <> 1 Then RETURN

 lul_file = CreateFile(ls_path, GENERIC_WRITE, &
 FILE_SHARE_WRITE, 0, CREATE_ALWAYS, 0, 0)
 IF lul_file = INVALID_HANDLE_VALUE THEN  RETURN
 // 写文件
 lul_length = Len(lblb_bitmap)
 lb_rtn = WriteFile(lul_file, lblb_bitmap, &
 lul_length, lul_written, 0)
 // 关闭文件
 CloseHandle(lul_file)

需要保持为jpg格式文件的，可以在将图片保存为bmp格式后，再调用外部dll将bmp转为紧jpg。相关dll可以到这里下载 pb最好用的bmp图片转jpg图片dll（ImageUtils.dll）

    

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PB从剪贴板取图并保存