| 发表于：2007-03-27 21:55:03 楼主 |
using system;
using system.drawing;
using system.collections;
using system.componentmodel;
using system.windows.forms;
using system.data;
using terminal.api;
namespace he
{
/// <summary>
/// form1 的摘要说明。
/// </summary>
public class form1 : system.windows.forms.form
{
private system.windows.forms.textbox txtbarcode1;
private dcdevent dcdevent;
public static dcdhandle hdcd;
private string dcddata = string.empty;
public form1（)
{
initializecomponent（);
dcdrequesttype reqtype = （dcdrequesttype)1 ¦ dcdrequesttype.postrecurring ;
dcdevent = new dcdevent（ form1.hdcd, reqtype);
dcdevent.scanned += new dcdscanned（dcdevent_scanned);
//this.closing += new canceleventhandler（acn_closing);
this.activated += new eventhandler（cashregister_activated);
}
void cashregister_activated（object sender,eventargs e)
{
if（dcdevent == null)
{
dcdrequesttype reqtype = （dcdrequesttype)1 ¦ dcdrequesttype.postrecurring ;
dcdevent = new dcdevent（ form1.hdcd, reqtype);
dcdevent.scanned += new dcdscanned（dcdevent_scanned);
}
}
//打开扫描头
private void dcdevent_scanned（object sender, dcdeventargs e)
{
codeid cid = codeid.nodata;
dcddata = string.empty;
try
{
dcddata = form1.hdcd.readstring（e.requestid, ref cid);
}
catch（exception)
{
messagebox.show（ "扫描出错 ");
return;
}
if（dcddata.length != 0)
invoke（new eventhandler（gobackmain));
}
private void gobackmain（object sender,eventargs e)
{
//dcddata = dcddata.trimend（new char[]{ '\r ', '\n ', ' ', ' '});
dcddata = dcddata.trimstart（new char[]{（char)2,（char)3});
dcddata = dcddata.trimend（new char[]{ '\r ', '\n ', ' ', ' ',（char)2,（char)3});
if（txtbarcode1.focused)
{
txtbarcode1.text = dcddata;
dcddata = string.empty;
//this.getbarcode（ txtbarcode1.text.trim（));
}
}
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void dispose（ bool disposing )
{
base.dispose（ disposing );
}
#region windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void initializecomponent（)
{
this.txtbarcode1 = new system.windows.forms.textbox（);
//
// txtbarcode1
//
this.txtbarcode1.location = new system.drawing.point（24, 32);
this.txtbarcode1.multiline = true;
this.txtbarcode1.size = new system.drawing.size（368, 256);
this.txtbarcode1.text = " ";
//
// form1
//
this.controls.add（this.txtbarcode1);
this.text = "form1 ";
}
#endregion
/// <summary>
/// 应用程序的主入口点。
/// </summary>
static void main（)
{
application.run（new form1（));
}
}
}
未处理的“system.nullreferenceexception”类型的异常出现在 terminal.api.dll 中。
里面的api是绝对没用问题的!有做扫描枪程序的朋友帮看看吗?
我这是写的一psc的扫描枪打开扫描头,然后获得条码显示到textbox上!
跪求! |
|
|
|
|
