【FAQ合集】TWAIN扫描识别工具Dynamic Web TWAIN的编程代码问题

1.如何获取黑白图像/span>

DWObject.OpenSource();DWObject.IfShowUI = false;DWObject.IfDisableSourceAfterAcquire = true;DWObject.PixelType = EnumDWT_PixelType.TWPT_BW; //Black - Whiteimage : EnumDWT_PixelType.TWPT_BW, GRAY image:EnumDWT_PixelType.TWPT_GRAY, RGBimage: EnumDWT_PixelType.TWPT_RGBDWObject.AcquireImage();

2.如何在没有用户界面的情况下运行/span>

function BeginScan(){    DWObject.OpenSource();    DWObject.IfShowUI = false; //set without user interface    DWObject.IfDisableSourceAfterAcquire = true;    DWObject.AcquireImage();}function DWObject_OnPostTransfer(){    DWObject.SaveAsBMP("C:\temp.bmp",0);}

3.如何只扫描纸张的某一部分/span>

DWObject.SelectSource();DWObject.OpenSource();DWObject.IfShowUI = false;//Set Image LayoutDWObject.Unit = EnumDWT_UnitType.TWUN_INCHES;DWObject.SetImageLayout(0, 0, 5, 5);DWObject.AcquireImage(); 

4.如何在不显示设备选择对话框的情况下选择设备/span>

DWObject.OpenSourceManager();for(i = 0, i<=DWObject.SourceCount - 1,i++){    if (DWObject.GetSourceNameItems(i) == "Specified device name")        DWObject.SelectSourceByIndex (i);}//if can't find the specified source, it'll select default sourceDWObject.AcquireImage(); 

5.如何在不使用UI获取图像时禁用进度指示器对话框/span>

DWObject.IfShowUI = false;DWObject.IfDisableSourceAfterAcquire = true;DWObject.OpenSource();DWObject.IfShowIndicator = false;DWObject.AcquireImage();

6.如何分别设置水平和垂直分辨率/span>

DWObject.SelectSource();DWObject.OpenSource();//Set XRESOLUTION current value.DWObject.Capability = 0x1118; //ICAP_XRESOLUTIONDWObject.CapType = 5; //TWON_ONEVALUEDWObject.CapValue = 300;if (DWObject.CapSet == false){    alert( "Failed to set the x-resolution. " + DWObject.ErrorString);}//Set YRESOLUTION current value.DWObject.Capability = 0x1119; //ICAP_YRESOLUTIONDWObject.CapType = 5; //TWON_ONEVALUEDWObject.CapValue = 200;if (DWObject.CapSet == false){   alert( "Failed to set the y-resolution." + DWObject.ErrorString);}DWObject.AcquireImage();

7.如何上传到Web服务器/span>

DWObject = document.getElementById("dwtcontrolContainer");//dwtcontrolContainer is the id of the Dynamic Web TWAIN on the page (An object or an embed).function btnScan_onclick(){DWObject.SelectSource();DWObject.OpenSource();DWObject.AcquireImage();}function btnUpload_onclick(){var strActionPage;var strHostIP;var CurrentPathName = unescape(location.pathname); // get current PathName inplain ASCIIvar CurrentPath = CurrentPathName.substring(0, CurrentPathName.lastIndexOf("/")+ 1);strActionPage = CurrentPath + "SaveToFile.aspx"; //the ActionPage's file pathstrHostIP = "localhost"; //The host's IP or nameDWObject.HTTPPort = 80;DWObject.HTTPUploadThroughPost(strHostIP,0,strActionPage,"imageData.tif");if (DWObject.ErrorCode != 0)alert(DWObject.ErrorString);else //succeedalert("Image Uploaded successfully");}

8.如何使用ADF望将每个文档保存在一个单独的文件中。

var iDocumentCounter =0;function BeginScan(){    DWObject.OpenSource();    DWObject.IfShowUI = false;    DWObject.IfDisableSourceAfterAcquire = true;    if(DWObject.Duplex != TWDX_NONE)        DWObject.IfDuplexEnabled = true; //enable duplexDWObject.IfFeederEnabled = true;    if (DWObject.IfFeederEnabled == true){         DWObject.XferCount = -1;         if(DWObject.IfFeederLoaded == True)             DWObject.AcquireImage();    }}function DWObject_OnPosttransfer(){iDocumentCounter = iDocumentCounter + 1;if(DWObject.SaveAsBMP("C:\Image\" + iDocumentCounter + ".bmp", 0) == false)    alert( DWObject.ErrorString);}

9.我如何使用SSL/span>

您可以使用IfSSL属性。下面的JavaScript示例将显示如何使用IfSSL属性。

function btnUpload_onclick(){   DWObject.HTTPPort = 80;   DWObject.IfSSL = false; // if 80 is the port number ofnon-secure port   /*   DWObject.HTTPPort = 443;   DWObject.IfSSL = true; // if 443 is the port number of secureport   */   DWObject.HTTPUploadThroughPost("127.0.0.1", 0,"/SaveToFile.php", "imageData.jpg");   if (DWObject.ErrorCode != 0)      alert(DWObject.ErrorString);   else //succeed     alert("Successful");}

10.如何将新扫描的图像添加到现有的多页TIFF文件中/span>

function Scan_Click(){   DWObject.AcquireImage();}function DWObject_OnPostTransfer(){   DWObject.CloseSource();   DWObject.IfTiffMultiPage = true;   DWObject.SaveAsTIFF("SaveAsTIFF.tif", 0);   if (DWObject.ErrorCode != 0)      alert (DWObject.ErrorString);   else //succeed      alert ("Successful");}

11.如何在保存之前旋转图像/span>

您可以使用RotateLeft方法和RotateRight方法。

12.如果缓冲区中有多个图像，如何查看指定的图像/span>

您可以通过更新API CurrentImageIndexInBuffer的值来查看指定的图像或浏览缓冲区中的所有图像。

function NextImage_Click(){   if (DWObject.HowManyImagesInBuffer == 0)      alert ("There is no image in buffer");   DWObject.CurrentImageIndexInBuffer += 1;}13.如何进行双面扫描unction DuplexScan_Click(){   DWObject.SelectSource();   DWObject.OpenSource();   DWObject.IfShowUI = false;   DWObject.IfDuplexEnabled = true; //enable duplex   DWObject.AcquireImage();} 

14.如何以反转颜色扫描图像/span>

您可以使用PixelFlavor属性。

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标签：扫描识别扫描与图像