Get scanner image-Twain Protocol

Source code (Save the connection as a download method, rename it as a zip file, and decompress it to the source file)

Download link http://hi.csdn.net/attachment/201107/19/0_1311044325WNjx.gif

Download the twain32 header file definition on the official Twain website.

Bool savebitmap (hglobal _ hdib, const int serial_number) {bitmapfileheader BFH = {0}; bitmapinfoheader * pbih = NULL; handle HF = NULL; // obtain the temporary file char _ sztempfile [max_path] = {0}; char _ sztempdir [max_path] = {0}; srand (gettickcount ()); gettemppatha (sizeof (_ sztempdir), _ sztempdir); sprintf_s (_ sztempfile, sizeof (_ sztempfile), "% S // %d-demod.bmp", _ sztempdir, serial_number, rand (); HF = createfilea (_ Sztempfile, generic_write, 0, null, create_always, file_attribute_normal, null); If (HF = invalid_handle_value) globalfree (_ hdib); Return false; // parse it into a bitmap file header pbih = (bitmapinfoheader *) globallock (_ hdib); DWORD dwbyteswritten = 0l; BFH. bftype = (Word) ('M' <8) | 'B'); BFH. bfsize = sizeof (bitmapfileheader) + sizeof (bitmapinfoheader) + (pbih-> biwidth * pbih-> bibitcount + 31)/32) * 4) * pbih-> bihei Ght) + pbih-> biclrused * sizeof (rgbquad); BFH. bfreserved1 = 0; BFH. bfreserved2 = 0; BFH. bytes = sizeof (bitmapfileheader) + sizeof (bitmapinfoheader) + pbih-> biclrused * sizeof (rgbquad); // write bitmap to the file writefile (HF, & BFH, sizeof (bitmapfileheader ), & dwbyteswritten, null); writefile (HF, pbih, BFH. bfsize-sizeof (bitmapfileheader), & dwbyteswritten, null); closehandle (HF); HF = invalid_handle_value; Trace ("Save bitmap to:"); trace (_ sztempfile); globalunlock (_ hdib); globalfree (_ hdib); Return true ;} unsigned long _ stdcall scanthread (void * ARGs) {hwnd _ hwnd = NULL; MSG _ MSG = {0}; hmodule _ hdsm = NULL; hbitmap _ hbitmap = NULL; int _ ncount = 0; tw_capability _ Cap = {0}; tw_uint16 _ twrc = twrc_failure; ptw_enumeration _ penumeration = NULL; ponevalue = NULL; tw_event _ twevent = {0 }; t W_identity _ DSID = {0}; tw_userinterface _ twui = {0}; tw_pendingxfers _ twpendingxfer = {0}; tw_uint16 _ modetype =-1; tw_uint32 _ Index = 0; tw_identity _ dsmid = {0, {1,703, twlg_usa, twcy_usa, "twain-1.7.0.3"}, 1, 7, (dg_image | dg_control), "XXXX it Corp. ltd. "," XXXX webctrl "," wuzh1230 "}; // initialize _ hdsm = loadlibrarya (" twain_32.dll "); // obtain the interface pointer dsmentryproc _ pdsmentryproc = (dsmentryproc) Ge Tprocaddress (_ hdsm, "dsm_entry"); // create a window and collect bitmap _ hwnd = create1_wexa (0, "#32770", "Scan client ", ws_overlappedwindow, 0, 0, 1, 1, null, null, getmodulehandlea (0), null); // open the data source Manager _ twrc = calldsmentry (& _ dsmid, null, dg_control, dat_parent, msg_opendsm, (tw_memref) & _ hwnd); // select the data source _ twrc = calldsmentry (& _ dsmid, null, dg_control, dat_identity, msg_getdefault, (tw_memre F) & _ DSID); _ twrc = calldsmentry (& _ dsmid, null, dg_control, dat_identity, msg_userselect, (tw_memref) & _ DSID ); // open the data source _ twrc = calldsmentry (& _ dsmid, null, dg_control, dat_identity, msg_opends, & _ DSID); // read and set the transmission mode icap_xfermech memset (& _ cap, 0, sizeof (tw_capability); _ cap. CAP = icap_xfermech; _ cap. contype = twon_enumeration; _ twrc = calldsmentry (& _ dsmid, & _ DSID, dg_control, dat_capabi Lity, msg_get, (tw_memref) & _ CAP); _ penumeration = (ptw_enumeration) globallock (_ cap. hcontainer); // search native-mode indexes for (_ Index = 0; _ index <_ penumeration-> numitems; _ index ++) {If (tw_uint16 *) _ penumeration-> itemlist) [_ Index] = twsx_native) {break;} // If (_ Index = _ penumeration-> numitems) {goto end_of_function;} // if the current index location mode is native if (_ Index = _ penumeration-> Curren Tindex) {trace ("Current xfer mode is 'native (twsx_native) '"); _ modetype = twsx_native; globalunlock (_ cap. hcontainer); globalfree (_ cap. hcontainer);} else {trace ("current mode is not 'native (twsx_native) '"); // sets the native mode, _ index is the index _ penumeration-> currentindex = _ index; _ penumeration-> defaultindex = _ index; globalunlock (_ cap. hcontainer); _ twrc = calldsmentry (& _ dsmid, & _ DSID, dg_con Trol, dat_capability, msg_set, (tw_memref) & _ CAP); If (_ twrc! = Twrc_success) {trace ("failed to set xfer mode to 'native (twsx_native) '"); goto end_of_function;} globalfree (_ cap. hcontainer); // read mode again _ twrc = calldsmentry (& _ dsmid, & _ DSID, dg_control, dat_capability, msg_get, (tw_memref) & _ CAP); If (_ twrc! = Twrc_success) {trace ("failed to read back xfer mode. "); goto end_of_function;} _ penumeration = (ptw_enumeration) globallock (_ cap. hcontainer); // read _ modetype = (tw_uint16 *) _ penumeration-> itemlist) [_ penumeration-> currentindex]; globalunlock (_ cap. hcontainer); globalfree (_ cap. hcontainer); // check whether the mode is native if (_ modetype! = Twsx_native) {trace ("xfer mode not 'native (twsx_native) ', quit. "); goto end_of_function;} trace (" Current xfer mode is 'native (twsx_native )'"); // read the cap_feederenabled trace ("read capability 'feed enabled (cap_feederenabled )'. "); memset (& _ cap, 0, sizeof (tw_capability); _ cap. CAP = cap_feederenabled; _ cap. contype = twon_onevalue; _ twrc = calldsmentry (& _ dsmid, & _ DSID, dg_control, dat_capabil Ity, msg_get, (tw_memref) & _ CAP); globalfree (_ cap. hcontainer); // failed to read the automatic paper feed device, possibly because no hardware supports if (_ twrc! = Twrc_success) {trace ("failed to read 'feed enabled (cap_feederenabled) '"); trace ("[possiblly no this hardware.]. "); If (feed_enabled) {trace (" no hardware to support feed, so unable to set, quit. "); goto end_of_function;} else {// There is a hardware trace for paper delivery (" OK to read 'feed enabled (cap_feederenabled) '"); trace (" [hardware present]. "); // first check whether memset (& _ cap, 0, sizeof (tw_capability) is enabled; _ cap. CAP = cap_feede Renabled; _ cap. contype = twon_onevalue; _ twrc = calldsmentry (& _ dsmid, & _ DSID, dg_control, dat_capability, msg_get, (tw_memref) & _ CAP); If (_ twrc! = Twrc_success) {trace ("failed to set 'feed enabled (cap_feederenabled) '"); globalfree (_ cap. hcontainer); goto end_of_function;} _ ponevalue = (ptw_onevalue) globallock (_ cap. hcontainer); // if you have enabled if (_ ponevalue-> item = feed_enabled) {trace ("[feeder enabled (cap_feederenabled)] is same as parameter ") globalunlock (_ cap. hcontainer); globalfree (_ cap. hcontainer);} // disabled. Enable the Paper Feed Device else {_ ponevalue-> ite M = feed_enabled; globalunlock (_ cap. hcontainer); _ twrc = calldsmentry (& _ dsmid, & _ DSID, dg_control, dat_capability, msg_set, (tw_memref) & _ CAP); globalfree (_ cap. hcontainer); If (_ twrc! = Twrc_success) {trace ("faile to set [feeder enabled (cap_feederenabled)]"); goto end_of_function ;}// read again and check whether memset (& _ cap, 0, sizeof (tw_capability); _ cap. CAP = cap_feederenabled; _ cap. contype = twon_onevalue; _ twrc = calldsmentry (& _ dsmid, & _ DSID, dg_control, dat_capability, msg_get, (tw_memref) & _ CAP); If (_ twrc! = Twrc_success) {globalfree (_ cap. hcontainer); trace ("failed to read [feeder enabled (cap_feederenabled)]"); goto end_of_function;} _ ponevalue = (ptw_onevalue) globallock (_ cap. hcontainer); globalunlock (_ cap. hcontainer); globalfree (_ cap. hcontainer); // trace ("OK to read [feed enabled (cap_feederenabled)]"); # If 0 // enable paper delivery: Read memset (& _ cap, 0, sizeof (tw_capability); _ cap. CAP = cap_autofeed; _ cap. Contype = twon_onevalue; _ twrc = calldsmentry (& _ dsmid, & _ DSID, dg_control, dat_capability, msg_get, (tw_memref) & _ CAP); If (_ twrc! = Twrc_success) {globalfree (_ cap. hcontainer); trace ("setting 'automatic paper delivery (cap_autofeed) 'failed"); goto end_of_function;} // if the paper delivery _ ponevalue = (ptw_onevalue) is enabled) globallock (_ cap. hcontainer); If (_ ponevalue-> item = autofeed_enabled) {globalunlock (_ cap. hcontainer); globalfree (_ cap. hcontainer);} // not enabled. Set else {_ ponevalue-> item = autofeed_enabled; globalunlock (_ cap. hcontainer); _ twrc = calldsmentry (& _ dsmid, & _ DS ID, dg_control, dat_capability, msg_set, (tw_memref) & _ CAP); globalfree (_ cap. hcontainer); If (_ twrc! = Twrc_success) {trace ("setting 'automatic paper delivery (cap_autofeed) 'failed"); goto end_of_function ;}}// read again, check whether memset (& _ cap, 0, sizeof (tw_capability); _ cap is enabled successfully. CAP = cap_autofeed; _ cap. contype = twon_onevalue; _ twrc = calldsmentry (& _ dsmid, & _ DSID, dg_control, dat_capability, msg_get, (tw_memref) & _ CAP); If (_ twrc! = Twrc_success) {globalfree (_ cap. hcontainer); trace ("setting 'automatic paper delivery (cap_autofeed) 'failed"); goto end_of_function;} _ ponevalue = (ptw_onevalue) globallock (_ cap. hcontainer); globalunlock (_ cap. hcontainer); globalfree (_ cap. hcontainer); // trace ("set 'automatic paper delivery (cap_autofeed) 'succeeded"); # endif} // display interface, scan _ twui. hparent = getactivewindow (); _ twui. showui = true; _ twrc = calldsmentry (& _ dsmid, & _ DSID, dg_control, dat_use Rinterface, msg_enableds, (tw_memref) & _ twui); If (_ twrc! = Twrc_success) {trace ("faile to enable UI. "); goto end_of_function;} // message loop _ twevent. pevent = (tw_memref) & _ MSG; while (getmessage (& _ MSG, null, 0, 0) {_ twrc = twrc_failure; _ twevent. twmessage =-1; _ twrc = calldsmentry (& _ dsmid, & _ DSID, dg_control, dat_event, msg_processevent, (tw_memref) & _ twevent ); if (_ twrc = twrc_failure | _ twevent. twmessage =-1) {trace ("failed to get message. "); G Oto end_of_function;} // the message is not sent from the data source. By default, if (_ twrc = twrc_notdsevent) {translatemessage (& _ MSG); dispatchmessage (& _ MSG ); continue;} // process the switch (_ twevent. twmessage) {// The bitmap is ready in the scanner. Case msg_xferready: {// cyclically accepts each bitmap memset (& _ twpendingxfer, 0, sizeof (tw_pendingxfers )); do {_ hbitmap = NULL; // accept a bitmap _ twrc = calldsmentry (& _ dsmid, & _ DSID, dg_image, dat_imagenativexfer, msg_get, (Tw_memref) & _ hbitmap); Switch (_ twrc) {Case twrc_xferdone: // transfer completed, save the bitmap {trace ("xfer is done. (twrc_xferdone) "); If (savebitmap (hglobal) _ hbitmap, _ ncount ++) {trace (" OK to save bitmap to file. ");} else {trace (" failed to save bitmap to file. ");} trace (" Send endxfer [msg_endxfer] Message. "); _ twrc = calldsmentry (& _ dsmid, & _ DSID, dg_control, dat_pendingxfers, msg_endxfer, (tw_memref) & _ TW Pendingxfer);} break; Case twrc_cancel: // cancel case twrc_failure: // failure default: {// end bitmap transmission trace ("User canceld (twrc_cancel ),"); trace ("or xfer failed (twrc_failure ). "); _ twrc = calldsmentry (& _ dsmid, & _ DSID, dg_control, dat_pendingxfers, msg_endxfer, (tw_memref) & _ twpendingxfer); trace (" Send endxfer message. ");} break;} while (_ twpendingxfer. count! = 0); // If there are multiple bitmaps} break; Case msg_closedsreq: // case msg_closedsok: // if the data source is closed successfully, Case msg_null: // empty message trace ("msg_closedsreq or msg_closedsok or msg_null)"); default: break; // ignore} // exit the outer loop if (_ twevent. twmessage! = Msg_null) {trace ("Break up from message loop. "); break;} end_of_function: trace (" start to cleanup resources of thread. "); // close the user interface memset (& _ twui, 0, sizeof (tw_userinterface); _ twui. hparent = _ hwnd; _ twui. showui = twon_dontcare8; _ twrc = calldsmentry (& _ dsmid, & _ DSID, dg_control, dat_userinterface, msg_disableds, (tw_memref) & _ twui ); // close the data source _ twrc = calldsmentry (& _ dsmid, null, dg_control, dat_identity, msg_closeds, & _ DSID); // close the data source Manager _ twrc = calldsmentry (& _ dsmid, null, dg_control, dat_parent, msg_closedsm, & _ hwnd); // close the window destroywindow (_ hwnd); // release the management database freelibrary (_ hdsm); Return 0 ;}