Dynamic Web TWAIN是一個專為Web應用程序設計的TWAIN掃描識別控件。你只需在TWAIN接口寫幾行代碼，就可以用兼容TWAIN的掃描儀掃描文檔或從數碼相機/采集卡中獲取圖像。然后用戶可以編輯圖像并將圖像保存為多種格式，用戶可保存圖像到遠程數據庫或者SharePoint。該TWAIN控件還支持上傳和處理本地圖像。

本文匯集了一些Dynamic Web TWAIN編程方面的常見問題，并且針對這些問題進行了回答，感興趣的朋友快來了解一下吧~

點擊下載Dynamic Web TWAIN正式版

問題1：如何在不顯示設備選擇對話框的情況下選擇設備？

答：代碼如下：

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(); 

問題2：在沒有UI的情況下獲取圖像時如何禁用進度指示器對話框？

答：代碼如下：

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

問題3：如何分別設置水平和垂直分辨率？

答：代碼如下：

DWObject.SelectSource();.SelectSource();
DWObject.OpenSource();DWObject.OpenSource();

//Set XRESOLUTION current value.//Set XRESOLUTION current value.
DWObject.Capability = 0x1118; //ICAP_XRESOLUTIONDWObject.Capability = 0x1118; //ICAP_XRESOLUTION
DWObject.CapType = 5; //TWON_ONEVALUEDWObject.CapType = 5; //TWON_ONEVALUE
DWObject.CapValue = 300;DWObject.CapValue = 300;
if (DWObject.CapSet == false){if (DWObject.CapSet == false){
    alert( "Failed to set the x-resolution. " + DWObject.ErrorString);( "Failed to set the x-resolution. " + DWObject.ErrorString);
}}

//Set YRESOLUTION current value.//Set YRESOLUTION current value.
DWObject.Capability = 0x1119; //ICAP_YRESOLUTIONDWObject.Capability = 0x1119; //ICAP_YRESOLUTION
DWObject.CapType = 5; //TWON_ONEVALUEDWObject.CapType = 5; //TWON_ONEVALUE
DWObject.CapValue = 200;DWObject.CapValue = 200;
if (DWObject.CapSet == false){if (DWObject.CapSet == false){
   alert( "Failed to set the y-resolution." + DWObject.ErrorString);( "Failed to set the y-resolution." + DWObject.ErrorString);
}}

DWObject.AcquireImage();DWObject.AcquireImage();

相關內容推薦：

Dynamic Web TWAIN常見問題（一）：如何選擇使用哪個版本？
Dynamic Web TWAIN常見問題（二）：相比其他的TWAIN SDK，主要優勢是什么？
Dynamic Web TWAIN常見問題（三）：Dynamic Web TWAIN將使用哪些操作系統？
Dynamic Web TWAIN常見問題（四）：編程問題-沒有用戶界面怎么工作？