Question

我有一个窗口窗体( Form1.h ),有 button 和 TextBox 。当窗体初始化时, TextBox 是空的。单击按钮时,窗体外的一种方法被调用,它应该更新 TextBox 。我如何从非窗体类别更新 TextBox ?下面是我的样本代码:

// Form1.h
private: System::Void findResultButton_Click(System::Object^  sender, System::EventArgs^  e) {
    FirstResults* firstResults = new FirstResults();
    firstResults->findResult();
}

// FirstResults.cpp
void FirstResults::findResult() { 
    // do some calculations here and find result.
    // write the result value to a .txt file.
    // Update TextBox in Form1.h with result value.
}

Answer 1

First you need to create a static instance of the form. Then in any .cpp file you want to access the TextBox1 or TextArea you just

public ref class Form1 : public System::Windows::Forms::Form
{
public:
    static Form1^ myForm1;

    Form1(void)
    {
        InitializeComponent();
        myForm1 = this;
        //
        //TODO: Add the constructor code here
        //
    }
}

Then in .cpp #include "form1.h" and

Form1^ myform1 = gcnew Form1();
Form1::myForm1->textBox1->Text = L" FROM the main.cpp ";

或者,如果你需要

System::Windows::Forms::myform1->textBox1->Text = L" FROM the main.cpp ";

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