Dynamic Web TWAIN常见问题（四）：编程问题-没有用户界面怎么工作？

Dynamic Web TWAIN正式版

问题1：如何获取黑白图像/strong>

答：

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

问题2：没有用户界面怎么工作/strong>

答：

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

问题3：如何只扫描纸张的特定部分/strong>

答：

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

问题4：如何在不显示设备选择对话框的情况下选择设备/strong>

答：

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

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相关内容推荐：

Dynamic Web TWAIN常见问题（一）：如何选择使用哪个版本/span>

Dynamic Web TWAIN常见问题（二）：相比其他的TWAIN SDK，主要优势是什么/span>

Dynamic Web TWAIN常见问题（三）：Dynamic Web TWAIN将使用哪些操作系统/span>

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