vb.netref的简单介绍
如何用vb.net编程在cad图形中插入dwg图块？
Dim ppr As PromptPointResult = ed.GetPoint("请选择插入点：")
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Dim pt As Point3d = ppr.Value
utility.WriteToEditor(pt.ToString())
Dim pidBlock As New PIDBlock()
'自己定义的图块类，保存图块的路径和名称
pidBlock.Name = "sample"
pidBlock.Path = blockPath "b_sample.dwg"
Using blkDb As New Database(False, True)
'read drawing
blkDb.ReadDwgFile(pidBlock.Path, System.IO.FileShare.Read, True, Nothing)
blkDb.CloseInput(True)
Using docLock As DocumentLock = doc.LockDocument()
'多文档要先这样，否则报至命错误
Using t As Transaction = doc.TransactionManager.StartTransaction()
'insert it as a new block
Dim idBTR As ObjectId = doc.Database.Insert(pidBlock.Name, blkDb, False)
'create a ref to the block
Dim bt As BlockTable = DirectCast(t.GetObject(doc.Database.BlockTableId, OpenMode.ForRead), BlockTable)
Dim btr As BlockTableRecord = DirectCast(t.GetObject(bt(BlockTableRecord.ModelSpace), OpenMode.ForWrite), BlockTableRecord)
Using bref As New BlockReference(pt, idBTR)
btr.AppendEntity(bref)
t.AddNewlyCreatedDBObject(bref, True)
End Using
t.Commit()
End Using
End Using
End Using
VB.NET RichTextBox 保存为 Word文档
将Word文档嵌入到WinForm窗体显示Word文档内容
private void 打开ToolStripMenuItem_Click(object sender, EventArgs e)
{
OpenFileDialog P_GetFile = new OpenFileDialog();//创建打开文件对话框对象
DialogResult P_dr = P_GetFile.ShowDialog();//显示打开文件对话框
if (P_dr == DialogResult.OK)//是否点击确定
{
WebBrowser.Navigate(P_GetFile.FileName);//打开Word文档并显示
}
}
//在Word文档中插入图片
private void btn_New_Click(object sender, EventArgs e)
{
btn_New.Enabled = false;//停用新建按钮
ThreadPool.QueueUserWorkItem(//使用线程池
(P_temp) =//使用lambda表达式
{
G_wa = new Word.Application();//创建Word应用程序对象
Word.Document P_wd = G_wa.Documents.Add(//建立新文档
ref G_missing, ref G_missing, ref G_missing, ref G_missing);
Word.Range P_Range = P_wd.Paragraphs[1].Range;//得到段落范围
object P_Ranges = P_Range;//创建ojbect对象
P_wd.InlineShapes.AddPicture(//向文档中插入图片
G_OpenFileDialog.FileName, ref G_missing, ref G_missing, ref P_Ranges);
G_str_path = string.Format(//计算文件保存路径
@"{0}\{1}", G_FolderBrowserDialog.SelectedPath,
DateTime.Now.ToString("yyyy年M月d日h时s分m秒fff毫秒") + ".doc");
P_wd.SaveAs(//保存Word文件
ref G_str_path,
ref G_missing, ref G_missing, ref G_missing, ref G_missing,
ref G_missing, ref G_missing, ref G_missing, ref G_missing,
ref G_missing, ref G_missing, ref G_missing, ref G_missing,
ref G_missing, ref G_missing, ref G_missing);
((Word._Application)G_wa.Application).Quit(//退出应用程序
ref G_missing, ref G_missing, ref G_missing);
this.Invoke(//开始执行窗体线程
(MethodInvoker)(() =//使用lambda表达式
{
btn_Display.Enabled = true;//启用显示按钮
MessageBox.Show("成功创建Word文档！", "提示！");
}));
});
}
vb.net 如何引用C++ 的DLL中的某个函数？
(\"Data.dll\") Private Shared Function ConnectPlayServer(ByVal Address As String, ByVal Port As Integer, ByVal DataPort As Integer, ByVal Username As String) As Boolean
End Function
Private Declare Auto Function a Lib \"Lib.dll\" (ByVal i As Integer) As String
VB.net 如何实现记住密码 自动登录
代码如下：
/// summary
/// 连接到窗体：通过密码保护信息找回密码！
/// /summary
/// param name="sender"/param
/// param name="e"/param
private void lbl_mibao_Click(object sender, EventArgs e)
{
Getbackpwd getbackpwd = new Getbackpwd();
getbackpwd.Show();
}
/// summary
/// 当该窗体加载时从xml文件中读取用户信息并加载到combox的Items中
/// /summary
/// param name="sender"/param
/// param name="e"/param
private void Addresslist_Load(object sender, EventArgs e)
{
XmlTextReader reader = new XmlTextReader(@"E:\面向对象--C#练习\通讯录\address list\address list\user.xml");
while (reader.Read())
{
//if (reader.LocalName.Equals("Name") || reader.LocalName.Equals("Number"))
if (reader.LocalName.Equals("username"))
{
this.cmbUserName.Items.Add(reader.ReadString());
}
//if (reader.LocalName.Equals("Number"))
//{
// this.label2.Text += reader.ReadString() + "\n";\
//}
}
reader.Close();
}
/// summary
/// 保存用户名到user.xml
/// /summary
//在listcontol上更改SelectedValue时执行从数据库读取密码的事件
private void cmbUserName_SelectedValueChanged(object sender, EventArgs e)
{
string username = cmbUserName.Text.Trim();
string sql = string.Format("select pwd from Admin where Username='{0}'", username);
try
{
SqlCommand command = new SqlCommand(sql, DBHelper.connection);
DBHelper.connection.Open();
SqlDataReader dataReader = command.ExecuteReader();
while (dataReader.Read())
{
txtpwd.Text = (string)dataReader["pwd"];
checkBoxpwd.Checked = true;
}
}
catch
{
MessageBox.Show("数据库操作出错！");
}
finally
{
DBHelper.connection.Close();
}
}
/// summary
/// 记住密码操作
/// /summary
/// param name="sender"/param
/// param name="e"/param
private void checkBoxpwd_Enter(object sender, EventArgs e)
{
bool check = true;
check = checkinput(cmbUserName.Text.Trim());
if ((string)cmbUserName.Text.Trim() == "")
{
MessageBox.Show("请输入用户名", "输入提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
cmbUserName.Focus();
}
else
{
if (txtpwd.Text.Trim() == "")
{
MessageBox.Show("请输入密码", "输入提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
txtpwd.Focus();
}
else
{
bool isValidUser = false; // 标识是否为合法用户
string message = ""; // 如果登录失败，显示的消息提示
// 如果验证通过，就显示相应的用户窗体，并将当前窗体设为不可见
if (ValidateInput())
{
// 调用用户验证方法
isValidUser = ValidateUser(cmbUserName.Text, txtpwd.Text, ref message);
// 如果是合法用户，显示相应的窗体
if (isValidUser)
{
if (check == true)
{
XmlDocument doc = new XmlDocument();
doc.Load(@"E:\面向对象--C#练习\通讯录\address list\address list\user.xml");//(@"E:\面向对象--C#练习\通讯录\address list\address list\user.xml");
XmlElement node = doc.CreateElement("user");
XmlNode xnode = (XmlNode)doc.CreateElement("username");
xnode.InnerText = cmbUserName.Text.Trim();
node.AppendChild(xnode);
doc.DocumentElement.InsertAfter(node, doc.DocumentElement.LastChild);
doc.Save(@"E:\面向对象--C#练习\通讯录\address list\address list\user.xml");
//doc.Load (@"E:\面向对象--C#练习\通讯录\address list\address list\user.xml");
}
}
// 如果登录失败，显示相应的消息
else
{
MessageBox.Show(message, "记住密码失败！", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
}
}
}
/// summary
/// 验证当前combox中内容是否已经存在于xml文件中
/// /summary
/// param name="text"/param
/// returns/returns
private bool checkinput(string text)
{
int count;
bool c = true;
for (count = 0; count cmbUserName.Items.Count;count ++ )
{
if (text ==(string )cmbUserName .Items [count])
{
c=false;
}
}
return c;
}
xml文件内容如下：?xml version="1.0" encoding="utf-8"?
person
user
VB.NET ReDim重定义动态数组
Array是一个类型,并非一个数组! 如果你想要传递数组,byval A() as string
VB.net 算术运算导致溢出
题主这个FunctionFindWindow(一堆参数)AsLong，返回值是个Long，而下面wd=FindWindow()，wd却是个Integer类型的，当然会溢出。楼上说都改成Long确实可以，不过题主的API声明是从VB里拷贝过来的吧？VB里的Long到.NET中就是Int32了，所以应该把上面FindWindow的返回类型由Long改为Int32（或者Integer）才是正解。
标题名称：vb.netref的简单介绍
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