VC下画图要用win32 GDI API VB下呢？

vb打印问题

大家好，问个vb打印问题

printer.print "dsff"
.....
....

Printer.EndDoc

打印成功后我将执行

sqlstr = "update vc_yh set pr=' 已打印 ', ......

VB 属性的使用无效

Private Sub DataList1_Click()
If DataList1.Text = "" Then
Lbl_EmpId = ""
Lbl_EmpName = ""
Lbl_Birth = ""
Lbl_Sex = ""
Lbl_Political_ ......

vb的picture控件的卸载

用vb的picture控件可以加载picture控件,例如
Set Picture1.Container = Picture3
这样就把Picture1加载到了Picture3上,那么怎么从Picture3卸载掉Picture1呢?
请各位朋友帮忙!谢谢!!
做了一个试验,将Pictur ......

vb中可选参数的问题

function multi(a as integer,b as integer,optional third)
dim n as integer
n = a * b
if not ismissing (third) then
n = n * thid
end if
multi = n
end fu ......