Question

PowerBuilder窗口中的结构体怎么使用

PowerBuilder窗口中的结构体怎么使用

Answer 1

结构体你应该懂得的，结构体是一种复杂的数据类型，就像数组一样，但是比数组复杂的多，它的主要区别是，一个结构体中可以定义多种不同的数据类型，同样的你可以在PB中应用结构体来定义一些变量（类似于窗口中的字段），可以使整型，也可以是数组，也可以是控件，窗口等等。要是想使用在程序中先定义，然后就可以使用这个结构体当中的一些变量了，比如：在程序中定义了一个结构体str_structure，在其中被定义了一个变量as_test，那么如果想在程序中使用这个变量，可以写
string ls_test
str_structure lstr_structure
ls_test = lstr_structure.as_texst
messagebox('ls_test ' , ls_test )
下面是PB中的英文资料，你可以看一下，不过极少使用这个的，我们公司的程序中只使用不到三个结构体，一般的方法已经能满足需要。
General information
A structure is a collection of one or more variables (sometimes called elements) that you want to group together under a single name. The variables can have any data type, including standard and object data types and other structures.
Defining structures
When you define a structure in the Structure painter or an object painter (such as Window, Menu, or User Object), you are creating a structure definition. To use the structure, you must declare it. When you declare it, an instance of it is automatically created for you. When it goes out of scope, the structure is destroyed.

For details about defining structures, see the PowerBuilder User's Guide.
Declaring structures
If you have defined a global structure in the Structure painter called str_emp_data, you can declare an instance of the structure in a script or in an object's instance variables. If you define the structure in an object painter, you can only declare instances of the structure in the object's instance variables and scripts.
This declaration declares two instances of the structure str_emp_data:

str_emp_data str_emp1, str_emp2

Referring to structure variables
In scripts, you refer to the structure's variables using dot notation:

structurename.variable

These statements assign values to the variables in str_emp_data:

str_emp1.emp_id = 100

str_emp1.emp_lname = "Jones"
str_emp1.emp_salary = 200
str_emp2.emp_id = 101
str_emp2.emp_salary = str_emp1.salary * 1.05

Using structures as instance variables
If the structure is declared as part of an object, you can qualify the structure name using dot notation:

objectname.structurename.variable

Suppose that this declaration is an instance variable of the window w_customer:

str_cust_data str_cust1

This statement in a script for the object refers to a variable of str_cust_data (the pronoun This is optional, because the structure declaration is part of the object):

This.str_cust1.name

This statement in a script for some other object qualifies the structure with the window name:

w_customer.str_cust1.name

Answer 2

窗口结构体是说窗口中定义的结构体吧，只能被窗口引用，相当个针对窗口的一个实例变量。窗口结构体定义方法：
编辑环境下打开一个窗体后，在view菜单→sturcture中添加即可

Answer 3

窗口中没有结构体吧~

Answer 4

什么叫窗口中的结构体?