All AWT component classes have a setCursor() method that allows for dynamically setting the cursor for a particular component and any subcomponents.For example, if you set the cursor for a Panel, all the components added to that Panel will inherit the Panel’s cursor unless the components explicitly override it. Once
Sometimes you need variables scoped by thread so that each thread has an independent copy. There’s an easy way to create and manage such variables.The java.lang.ThreadLocal class provides a wrapper around an object that’s guaranteed to be independent in each accessing thread. To create a ThreadLocal object, implement the initialValue()
If class B uses only pointers or references of class A, you don’t have to include A.h. You can simply forward declare class A as shown below. //File B.hclass A; //forward Decalarationclass B{ A * ptrA; .. //other members};
Suppose you want to pass a Boolean system property, -DDEBUG=true or -DDEBUG=false, from the command line. Normally, you’d probably use the following in source code to retrieve it: boolean b = Boolean.valueOf(System.getProperty(“DEBUG”)).booleanValue();if(b) { //do something;}or just treat it as a string system property:if(System.getProperty(“DEBUG”).equalsIgnoreCase(“true”)) { //do something;} The following code offers
// Quickly zero out a struct. This can be applied// To an array of structs also, since// memset() initializes memory regions#include struct sample {int a;short int b;int c;};struct sample s;// Initialize all members to zero (Be careful of// Incompatible Data types.memset( s, 0, sizeof(sample) );// Array of structs examplememset( s,
The new ANSI C++ standard specifies that variables declared as in for(int i=1; …) have a scope local to the for statement. Unfortunately, older compilers (like Visual C++ 5.0) use the older concept that the scope is the enclosing group. Below, I list two possible problems arising from this change
Use the following code: select *,right(field1,4) as Col1 from [Tablename]order by col1 You can do it by using substring: SELECT *, substring(field1, 3, 5) as col1from [tablename]order by col1
‘*********************************************************************’Text files Reading’You can use Microsoft Text Driver’*********************************************************************Public Function Read_Text_File() As ADODB.Recordset Dim rs As ADODB.Recordset Set rs = New ADODB.Recordset Dim conn As ADODB.Connection Set conn = New ADODB.Connection conn.Open “DRIVER={Microsoft Text Driver (*.txt; *.csv)};” & _ “DBQ=” & App.Path & “;”, “”, “” rs.Open “select * from [test#txt]”,
This code will do the trick: ABCDEFGHIJKLMNOPQRSTUVWXYZ