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unit MultiTWAIN;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls, ExtCtrls, CommDlg;
// Some of the functions in EZTWAIN require unsigned integers. However,
// it was not until the recent release of Delphi 4 that Inprise implemented
// this; they did so with LongWord/Cardinal. As far as D2 and D3 go, this
// unit will attempt to substitute an Integer instead. I don't know if it'll
// work though!
type
{$IFDEF VER100}
UnsignedInt32 = Cardinal;
{$ELSE}
UnsignedInt32 = Integer;
{$ENDIF}
hDibCallbackProc = procedure(curdib: THandle; n: Integer); stdcall;
const
TWAIN_BW=1; { 1-bit per pixel, B&W (== TWPT_BW) }
TWAIN_GRAY=2; { 1,4, or 8-bit grayscale (== TWPT_GRAY) }
TWAIN_RGB=4; { 24-bit RGB color (== TWPT_RGB) }
TWAIN_PALETTE=8; { 1,4, or 8-bit palette (== TWPT_PALETTE) }
TWAIN_ANYTYPE=0; { any of the above }
TWAIN_PRESESSION=1; { source manager not loaded }
TWAIN_SM_LOADED=2; { source manager loaded }
TWAIN_SM_OPEN=3; { source manager open }
TWAIN_SOURCE_OPEN=4; { source open but not enabled }
TWAIN_SOURCE_ENABLED=5; { source enabled to acquire }
TWAIN_TRANSFER_READY=6; { image ready to transfer }
TWAIN_TRANSFERRING=7; { image in transit }
TWUN_INCHES=0;
TWUN_CENTIMETERS=1;
TWUN_PICAS=2;
TWUN_POINTS=3;
TWUN_TWIPS=4;
TWUN_PIXELS=5;
{$L eztwain.obj}
function TWAIN_SelectImageSource(hwnd: HWND): Integer; stdcall; external;
function TWAIN_AcquireNative(hwnd: HWND; pixmask: Integer): HBitmap; stdcall; external;
procedure TWAIN_FreeNative(hDIB: HBitmap); stdcall external;
function TWAIN_AcquireToClipboard(hwndApp: HWND; wPixTypes: UnsignedInt32): Integer; stdcall; external;
function TWAIN_AcquireToFilename(hWndApp: HWND; pszFile: PChar): Integer; stdcall; external;
function TWAIN_IsAvailable: Integer; stdcall; external;
function TWAIN_EasyVersion: Integer; stdcall; external;
function TWAIN_State: Integer; stdcall; external;
// Added by DSN 7/98, this allows the user to specify an
// optional callback function to be called each time a new image comes
// in. This can be a potentially powerful way to increase the primary
// application's efficiency, because upon receipt of an hdib the app
// could start a background thread to begin processing the images as
// needed. Why bother with this? Because on my Pentium 150, the Windows
// NT task monitor indicates that when I download images at 112kbps that
// I'm only using 15% of the processor's power, and the remaining 85% of
// the time it is idle! It's silly to wait to begin processing because
// there's so much untapped processing capacity here.
procedure TWAIN_RegisterCallback(fxn: hDibCallbackProc); stdcall; external;
procedure TWAIN_UnRegisterCallback; stdcall; external;
// the next three functions were added by DSN to manage acquisition of multiple
// images. The first, TWAIN_CleadDibList, is called automatically by
// TWAIN_AcquireNative (and, hence, the other Acquire functions).
// TWAIN_GetNumDibs returns the number of images available.
// Finally, TWAIN_GetDib retrieves a specific dib from the list. Note that
// the first dib corresponds to n = 0.
// ALSO NOTE: the maximum number of dibs that can be scanned in is 999
// This value may easily be expanded by changing the MAX_IMAGES constant
// in the C code.
procedure TWAIN_ClearDibList; stdcall; external;
function TWAIN_GetNumDibs: Integer; stdcall; external;
function TWAIN_GetDib(n: Integer): THandle; stdcall; external;
function TWAIN_DibDepth(hDib: HBitmap): Integer; stdcall; external;
function TWAIN_DibWidth(hDib: HBitmap): Integer; stdcall; external;
function TWAIN_DibHeight(hDib: HBitmap): Integer; stdcall; external;
function TWAIN_DibNumColors(hDib: HBitmap): Integer; stdcall; external;
function TWAIN_CreateDibPalette(hdib: HBitmap): Integer; stdcall; external; // HANDLE & HPALETTE, respectively
procedure TWAIN_DrawDibToDC(
hDC: HDC;
dx, dy, w, h: Integer;
hDib: HBitmap;
sx, sy: Integer
); stdcall; external;
function TWAIN_WriteNativeToFilename(hdib: hBitmap; pszFile: PChar): Integer; stdcall; external;
function TWAIN_WriteNativeToFile(hdib: HBitmap; fh: Integer): Integer; stdcall; external;
function TWAIN_LoadNativeFromFilename(pszFile: PChar): HBitmap; stdcall; external;
function TWAIN_LoadNativeFromFile(fh: Integer): HBitmap; stdcall; external;
procedure TWAIN_RegisterApp( nMajorNum,nMinorNum: integer;
nLanguage: integer;
nCountry: integer;
lpszVersion: PChar;
lpszMfg: PChar;
lpszFamily: PChar;
lpszProduct: PChar); stdcall; external;
procedure TWAIN_SetHideUI(fHide: Integer); stdcall; external;
function TWAIN_GetHideUI: Integer; stdcall; external;
function TWAIN_GetResultCode: UnsignedInt32; stdcall; external;
function TWAIN_GetConditionCode: UnsignedInt32; stdcall; external;
function TWAIN_LoadSourceManager: Integer; stdcall; external;
function TWAIN_OpenSourceManager(hwnd: HWND): Integer; stdcall; external;
function TWAIN_OpenDefaultSource: Integer; stdcall; external;
function TWAIN_EnableSource(hwnd: hWnd): Integer; stdcall; external;
function TWAIN_DisableSource: Integer; stdcall; external;
function TWAIN_CloseSource: Integer; stdcall; external;
function TWAIN_CloseSourceManager(hWnd: HWND): Integer; stdcall; external;
function TWAIN_UnloadSourceManager: Integer; stdcall; external;
function TWAIN_MessageHook(lpmsg: PMSG): Integer; stdcall; external;
procedure TWAIN_ModalEventLoop; stdcall; external;
procedure TWAIN_NativeXferGetAll(psmg: PMSG); stdcall; external; // for multiple xfers
function TWAIN_AbortAllPendingXfers: Integer; stdcall; external;
function TWAIN_WriteDibToFile(lpDIB: PBITMAPINFOHEADER; fh: Integer): Integer; stdcall; external;
function TWAIN_NegotiateXferCount(nXfers: Integer): Integer; stdcall; external;
function TWAIN_NegotiatePixelTypes(wPixTypes: UnsignedInt32): Integer; stdcall; external;
function TWAIN_GetCurrentUnits: Integer; stdcall; external;
function TWAIN_SetCurrentUnits(nUnits: Integer): Integer; stdcall; external;
function TWAIN_GetBitDepth: Integer; stdcall; external;
function TWAIN_SetBitDepth(nBits: Integer): Integer; stdcall; external;
function TWAIN_GetPixelType: Integer; stdcall; external;
function TWAIN_SetCurrentPixelType(nPixType: Integer): Integer; stdcall; external;
function TWAIN_GetCurrentResolution: double; // implemented below
function TWAIN_SetCurrentResolution(dRes: double): Integer; // implemented below
function TWAIN_SetCapOneValue(Cap: UnsignedInt32; ItemType: UnsignedInt32; ItemVal: LongInt): Integer; stdcall; external;
function TWAIN_GetCapCurrent(Cap: UnsignedInt32; ItemType: UnsignedInt32; pVal: Pointer): Integer; stdcall; external;
function TWAIN_DS(DG: LongInt; DAT: UnsignedInt32; MSG: UnsignedInt32; pData: Pointer): Integer; stdcall; external;
function TWAIN_Mgr(DG: LongInt; DAT: UnsignedInt32; MSG: UnsignedInt32; pData: Pointer): Integer; stdcall; external;
procedure CopyDIBIntoImage(hDIB: THandle; Image: TImage);
implementation
{ The procedures implemented below are the ones which use floating point numbers }
const
ICAP_XRESOLUTION = $1118;
ICAP_PIXELTYPE = $0101;
TWTY_FIX32 = $0007;
TWTY_UINT16 = $0004;
type
TW_FIX32 = record
Whole: SmallInt;
Frac: Word;
end;
function ToFix32(r: Double): UnsignedInt32;
var
fix: TW_FIX32;
v: Integer;
begin
v := Round(r * 65536.0 + 0.5);
fix.Whole := ShortInt(V shr 16);
fix.Frac := Word (v and $ffff);
ToFix32 := UnsignedInt32(fix);
end;
function Fix32ToFloat(fix: TW_FIX32): double;
var
v: Integer;
begin
v := (Integer(fix.Whole) shl 16) or (UnsignedInt32(fix.frac) and $ffff);
Fix32ToFloat := v / 65536.0;
end;
function TWAIN_GetCurrentResolution: double;
var
res: TW_FIX32;
begin
TWAIN_GetCapCurrent(ICAP_XRESOLUTION, TWTY_FIX32, @res);
TWAIN_GetCurrentResolution := Fix32ToFloat(res);
end;
function TWAIN_SetCurrentResolution(dRes: double): Integer;
begin
TWAIN_SetCurrentResolution := TWAIN_SetCapOneValue(ICAP_XRESOLUTION, TWTY_FIX32, ToFix32(dRes));
end;
(*************************************************)
procedure CopyDIBIntoImage(hDIB: THandle; Image: TImage);
var
DibW, DibH, oldw, oldh: integer;
begin
Oldw := Image.Width;
Oldh := Image.Height;
DibW := TWAIN_DibWidth(hDib);
DibH := TWAIN_DibHeight(hDib);
Image.Width := DibW; // temporarily enlarge image to ensure the whole
Image.Height := DibH; // DIB gets copied
TWAIN_DrawDibToDC(Image.Canvas.Handle, 0, 0, DibW, DibH, hDIB, 0, 0);
Image.Width := oldw;
Image.Height := oldh;
end;
{ The function below was adapted from code on www.codeguru.com. After
I translated it from C++ I realized I wouldn't need it; however, I've
left it in here in case anyone else finds it useful. NOTE: I never
tested to make sure my translation was accurate, so be careful! -- DSN 7/98
function DIBToDDB(hDIB: THandle): HBitmap;
var
lpbi: PBitmapInfoHeader;
hbm: HBitmap;
Pal, OldPal: HPalette;
dc: HDC;
nSize: UnsignedInt32;
pLP: PLogPalette;
nColors, i: Integer;
lpDIBBits: Pointer;
bmInfo: PBitmapInfo;
bmicoloraddr: PChar;
bmisum: PChar;
bmisumncolor: PChar;
begin
if (hDIB = 0) then
begin
DIBToDDB := 0;
exit;
end;
dc := GetDC(0);
pal := 0;
lpbi := PBitmapInfoHeader(hDIB);
if (lpbi^.biClrUsed > 0) then
nColors := lpbi^.biClrUsed
else nColors := 1 shl lpbi^.biBitCount;
bmicoloraddr := PChar(@(bmInfo^.bmiColors));
bmiSum := bmiColorAddr + (bmInfo^.bmiHeader.biClrUsed * sizeof(DWORD));
if bmInfo^.bmiHeader.biCompression = BI_BITFIELDS then
bmiSum := bmiSum + (3 * sizeof(DWORD));
bmisumncolor := bmiColorAddr + (nColors * sizeof(DWORD));
if bmInfo^.bmiHeader.biBitCount > 8 then
lpDIBBits := Pointer(bmiSum)
else lpDIBBits := Pointer(bmisumncolor);
if (nColors <= 256 and (GetDeviceCaps(dc, RASTERCAPS) and RC_PALETTE)) then
begin // Create and select a logical palette if needed
nSize := sizeof(TLogPalette) + (sizeof(TPaletteEntry) * nColors);
GetMem(pLP, nSize);
pLP^.palVersion := $0300;
pLP^.palNumEntries := ncolors;
for i := 0 to nColors do
begin
pLP^.palPalEntry[i].peRed := bmInfo.bmiColors[i].rgbRed;
pLP^.palPalEntry[i].peGreen := bmInfo.bmiColors[i].rgbGreen;
pLP^.palPalEntry[i].peBlue := bmInfo.bmiColors[i].rgbBlue;
pLP^.palPalEntry[i].peFlags := 0;
end;
pal := CreatePalette(pLP^);
FreeMem(pLP);
OldPal := SelectPalette(dc, pal, False);// select and realize the palette
RealizePalette(dc);
end;
hbm := CreateDIBitmap(dc,
(PBitmapInfoHeader(lpbi))^,
LongInt(CBM_INIT),
lpDIBBits,
(PBitmapInfo(lpbi))^,
DIB_RGB_COLORS);
if pal <> 0 then
SelectPalette(dc, Oldpal, False);
ReleaseDC(0, dc);
DIBToDDB := hbm;
end;}
end. |
Unité Multitwain de David Nieves
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