**object : n_webcam**
================================================================================
forward
global type nvo_webcam from nonvisualobject
end type
end forward
global type nvo_webcam from nonvisualobject autoinstantiate
end type
prototype type
function ulong capCreateCaptureWindowA (string lpszWindowName, ulong dwStyle, long li_x, long li_y, long nWidth, long nHeight, ulong ParentWin, long nId) LIBRARY 'AVICAP32.DLL' alias for "capCreateCaptureWindowA; ansi"
Function ulong GetDC (ulong hWnd) Library "user32.dll"
Function long ReleaseDC (ulong hWnd, ulong hdcr) Library "USER32.DLL"
Function ulong CreateCompatibleDC (ulong hdc) Library "gdi32.dll"
Function ulong CreateCompatibleBitmap (ulong hdc, ulong nWidth, ulong nHeight) Library "gdi32.dll"
Function boolean DeleteDC (ulong hDC) Library "Gdi32.dll"
Function boolean BitBlt (ulong hdcDest, long nXDest, long nYDest, long nWidth, long nHeight, ulong hdcSrc, long nXSrc, long nYSrc, long dwRop) Library "gdi32.dll"
Function boolean StretchBlt (ulong hdcDest, long nXOriginDest, long nYOriginDest, long nWidthDest, long nHeightDest, ulong hdcSrc, long nXOriginSrc, longnYOriginSrc, long nWidthSrc, long nHeightSrc, long dwRop) Library "gdi32.dll"
Function ulong SelectObject (ulong hdc, ulong HGDIOBJ) Library "gdi32.dll"
Function along GetDIBits (ulong hdc, ulong hbmp, uint uStartScan, uint cScanLines, Ref blob lpvBits, Ref BITMAPINFO lpbi, uint uUsage) Library "gdi32.dll" alias for "GetDIBits"
Function long GetDIBits (ulong hdc, ulong hbmp, uint uStartScan , uint cScanLines, ulong lpvBits, ref bitmapinfo lpbi, uint uUsage) Library "gdi32.dll" alias for "GetDIBits"
Subroutine CopyBitmapFileHeader (Blob Ref Destination, bitmapfileheader Source, long Length) Library "kernel32.dll" Alias For "RtlMoveMemory" Subroutine CopyBitmapInfo (Blob Ref Destination, Source bitmapinfo, long Length) Library "kernel32.dll" Alias For "RtlMoveMemory"
Function boolean OpenClipboard (ulong hWndNewOwner) Library "user32.dll"
Function boolean CloseClipboard() Library "user32.dll"
Function boolean EmptyClipboard() Library "user32.dll"
Function ulong GetClipboardData (ulong uFormat) Library "user32.dll"
end prototypes
such variables
Uint LHand
Constant long GET_FRAME = 1084
Constant long COPY = 1054
Constant long WM_USER = 1024
Constant long WM_CAP_START = WM_USER
Constant long WM_CAP_STOP = WM_CAP_START + 68
Constant long WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10
Constant long WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11
Constant long WM_CAP_SAVEDIB = WM_CAP_START + 25
Constant Long WM_CAP_GRAB_FRAME = WM_CAP_START + 60
Constant LongWM_CAP_SEQUENCE = WM_CAP_START + 62
Constant long WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + 20
Constant long WM_CAP_FILE_SAVEAS = WM_CAP_START + 23
Constant long WM_CAP_SEQUENCE_NOFILE = WM_CAP_START + 63
Constant long WM_CAP_SET_OVERLAY = WM_CAP_START + 51
Constant long WM_CAP_SET_PREVIEW = WM_CAP_START + 50
Constant long WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START +6
Constant long WM_CAP_SET_CALLBACK_ERROR = WM_CAP_START + 2
Constant Long WM_CAP_SET_CALLBACK_STATUSA = WM_CAP_START +3
Long Constant WM_CAP_SET_CALLBACK_FRAME = WM_CAP_START +5
Long Constant WM_CAP_SET_SCALE = WM_CAP_START + 53
Long Constant WM_CAP_SET_PREVIEWRATE = WM_CAP_START + 52
end variables
forward prototypes
public subroutine of_close()
public subroutine of_initialize_webcam (unsignedlong a_handle, string a_title, integer a_width, integer a_height)
public function blob of_copy_clipboard_to_blob()
public subroutine of_capture_pic()
end prototypes
public subroutine of_close(); send (lhand, WM_CAP_DRIVER_DISCONNECT, 0, 0)
end subroutine
public subroutine of_initialize_webcam (unsigned long a_handle, string a_title, integer a_width, integer a_height); string lpszName
lpszName = a_title
if lhand = 0 then
lhand = capCreateCaptureWindowA (lpszName, 262144 + 12582912 + 1073741824 + 268435456, 1.40, a_width, a_height, a_handle, 0)
end if
if lhand <> 0 then
send (lhand, WM_CAP_SET_CALLBACK_VIDEOSTREAM, 0, 0)
send (lhand, WM_CAP_SET_CALLBACK_ERROR, 0, 0)
send (lhand, WM_CAP_SET_CALLBACK_STATUSA, 0, 0)
send (lhand, WM_CAP_DRIVER_CONNECT, 0, 0)
send (lhand, WM_CAP_SET_SCALE, 1, 0)
send (lhand, WM_CAP_SET_PREVIEWRATE, 66, 0)
send (lhand, WM_CAP_SET_OVERLAY, 1, 0)
send (lhand, WM_CAP_SET_PREVIEW, 1, 0)
end if
end subroutine
public function blob of_copy_clipboard_to_blob(); BitmapInfo lstr_Info
BitmapFileHeader lstr_Header
Blob lblb_header, lblb_info, lblb_bitmap, lbl_final
ULong lul_hdc, lul_hdcMem, lul_hBitmap, lul_hWnd, lul_blpos
UInt DIB_RGB_COLORS
Integer li_pixels
Boolean lb_result
long al_width, ll_height, ll_ret
constant integer BITMAPTYPE = 19778 // 4D42 = BM
constant integer CF_BITMAP = 2
constant integer CF_DIB = 8
lul_hWnd = Handle (this)
lb_result = OpenClipboard (lul_hWnd)
// Get the device context and allocate memory
lul_hdc = GetDC (lul_hWnd)
lul_hdcMem = CreateCompatibleDC (lul_hdc)
lul_hBitmap = getclipboarddata (CF_BITMAP)
// try to store the bitmap into a blob so we can save it
lstr_Info.bmiHeader.biSize = 40
ll_height = 480 // ... 480 should be enough for everyone? ;)
DIB_RGB_COLORS = 0
// Get the bitmapinfo
If GetDIBits (lul_hdcMem, lul_hBitmap, 0, ll_height, 0, lstr_Info, DIB_RGB_COLORS)> 0 Then
li_pixels = lstr_Info.bmiHeader.biBitCount
lstr_Info.bmiColors [li_pixels] = 0
lblb_bitmap = Blob (Space (lstr_Info.bmiHeader.biSizeImage), EncodingANSI!)
ll_height = lstr_Info.bmiHeader.biheight
// get the actual bits
ll_ret = GetDIBits (lul_hdcMem, lul_hBitmap, 0, ll_height, lblb_bitmap, lstr_Info, DIB_RGB_COLORS)
// ls_msg = hexdump_blob (lblb_bitmap, false)
// create a bitmap header
lstr_Header.bfType = BITMAPTYPE
lstr_Header.bfSize = lstr_Info.bmiHeader.biSizeImage
lstr_Header.bfOffBits = 54 + (li_pixels * 4)
// copy the header structure to a blob
lblb_header = Blob (Space (7)) //
14/2 CopyBitmapFileHeader (lblb_header, lstr_Header, 14)
// copy the info structure to a blob
lblb_Info = Blob (Space (40 + li_pixels * 4)/2))
CopyBitmapInfo (lblb_Info, lstr_Info, len (lblb_Info))
// add all together and we have a window bitmap in a blob
lbl_final = lblb_header + lblb_info + lblb_bitmap
End If
CloseClipboard()
ReleaseDC (lul_hwnd, lul_hdc)
DeleteDC (lul_hdcMem)
return lbl_final
end function
public subroutine of_capture_pic(); Send (lhand, GET_FRAME, 0, 0)
Send (lhand, COPY, 0, 0)
end subroutine
we have nvo_webcam. create
call super :: create
TriggerEvent (this , "constructor")
end on
we have nvo_webcam. destroy
TriggerEvent (this , "destructor")
call super :: destroy
end on
**instantiate the object and initialize it:**
================================================================================
n_webcam.of_initialize_webcam (handle (this), "Webcam" , il_width, il_height)
**capture:**
================================================================================
n_webcam.of_capture_pic()
**image processing:**
================================================================================
lb_blob = n_webcam..of_copy_clipboard_to_blob()
// reinitialize for the webcam to continue live
i_nvo_webcam.of_initialize_webcam (handle (this), "Webcam" , il_width, il_height)
**Close:**
================================================================================
n_webcam.of_close()
वीडियो देखें https://youtu.be/ojcJs1ajWRc
जांच के बाद समस्या तरह से है कि मैं खाली पन्नों को छोड़ करने के लिए इस्तेमाल के साथ करना था। (यहां पेज 21 पर देखें http://www.dosadi.com/pub/eztp/EZTwain_User_Guide.pdf) मैं TWAIN_BeginMultipageFile और Do loop का उपयोग कर रहा था। जब मैंने इसे TWAIN_AcquireMultipageFile और TWAIN_SetBlankPageMode (1) में बदल दिया, तो समस्या हल हो गई। आप पृष्ठ को 'रिक्त' के रूप में माना जाने वाला पृष्ठ के लिए 'अंधेरे पिक्सेल' अनुपात को समायोजित करने के लिए TWAIN_SetBlankPageThreshold का भी उपयोग कर सकते हैं। आखिर में मैंने रिक्त पृष्ठ चूक को पूरी तरह से छोड़ने का फैसला किया। हालांकि मेरे पास कोडक मॉडल अब उपलब्ध नहीं है, मुझे विश्वास है कि इसमें कोई समस्या नहीं होगी। –
EZTwain जनवरी 2011 में अटालासॉफ्ट (अब कोफैक्स का हिस्सा) द्वारा खरीदा गया था, लेकिन एटालासॉफ्ट लाइसेंस प्राप्त ईज़ीटीवेन डेवलपर्स के लिए ई-मेल और फोरम समर्थन प्रदान करता रहा है। उनके पास एक महान समर्थन टीम है। (हाँ, मैं उनके लिए काम करता हूं ;-) – Spike0xff