Question

我几个月来一直在学习C ++ / CLI，但无论我尝试什么，我似乎无法解决我遇到的问题。

我需要将一个String ^，Array ^或一个ArrayList ^数据类型从main.cpp传递给Form1.h。我试图在main.cpp中创建变量global，然后使用extern调用变量。但是，这不适用于String，Array和ArrayList数据类型。

我该怎么做呢？提前致谢。以下是我的代码的解释：

//main.cpp

bool LoadFileFromArgument = false; //A boolean can be declared global
String^ argument; //this will not pass from main.cpp to Form1.h

int main(array<System::String ^> ^args)
{
String ^ argument = args[1]

// Enabling Windows XP visual effects before any controls are created
Application::EnableVisualStyles();
Application::SetCompatibleTextRenderingDefault(false); 

// Create the main window and run it
Application::Run(gcnew Form1());

return 0;
}



//Form1.h

public ref class Form1 : public System::Windows::Forms::Form
{
public:
    Form1(void)
    {
        InitializeComponent();
        //
        //TODO: Add the constructor code here
        //

        extern bool LoadFileFromArgument; //is grabbed without error
        extern String^ argument; //will not work

这是错误：

error C3145: 'argument' : global or static variable may not 
have managed type 'System::String ^'

may not declare a global or static variable,
or a member of a native type that refers to objects in the gc heap

Answer 1

您是否可以为表单创建重载的构造函数。即。

public ref class Form1 : public System::Windows::Forms::Form
{
public:
    Form1(String^ argument)
    {
        InitializeComponent();
        //
        //TODO: Add the constructor code here
        // 
        // Use "argument" parameter as req'd.
    }

    Form1(void)
    {
        //....usual constructor here...
        //..etc...

然后从主

// Create the main window and run it
Application::Run(gcnew Form1(argument));

在C ++ / CLI中将命令行参数传递给Windows窗体文件

1 个答案: