从不同的类更改文本框的值？ [英] Change value of textBox from different class?
问题描述
如果我有一个C ++ / CLI的形式与 TextBox1的键，一类叫做假在另一头文件，是什么我可以做，如果我想改变直接，在虚拟类存在的 textbox1.Text 由函数的值？
If I have a C++/CLI form with textbox1 and a class called Dummy in another header file, what can I do if I want to change "directly" the value of textbox1.Text by a function exists in Dummy class?
推荐答案
C ++做单通编译。这意味着你不能使用的东西，直到编译器已经看到了。
C++ does single-pass compilation. That means you can't use something until the compiler has already seen it.
当您在使用互为两个班，这可能会非常棘手。幸运的是，C ++还允许向声明，它告诉编译器这是一类或函数签名我会为您提供更高。
When you have two classes using each other mutually, that can be tricky. Luckily C++ also allows forward declaration, which tells the compiler "Here is the signature for a class or function I'm going to provide you with later".
在一般情况下，提供编译器的下面，顺序如下：
In general, provide the compiler with the following, in this order:
-
类向前声明
forward declaration of classes
ref class Dummy;
ref class MyForm;
类定义
class definitions
ref class Dummy { ... };
ref class MyForm { ... };
类的成员函数的定义
class member function definitions
void Dummy::DoIt()
{
myForm->textBox1->Text = whatever;
}
通常情况下，唯一需要的就是要放在一个.cpp文件中的函数定义，并确保.cpp文件的#include S对于每一个类的头文件。对于你的问题，那会意味着你应该把这个行 Dummy.cpp ，其中既包括 Dummy.h 和 myform.h 。
Often, the only thing needed is to put function definitions in a .cpp file, and make sure that .cpp file #includes the header file for every class. For your problem, that'd mean you should put this line in Dummy.cpp, which includes both Dummy.h and myform.h.
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