将System :: object转换为字符串数组 [英] Convert System::object to string array

问题描述

在后台工作程序通过串行端口接收数据的过程中，我需要返回字符串的三维数组。

I need to return four dimensional array of strings during the work of background worker which is receiving data via serial port.

在后台工作程序中：

    array<String^>^ Received = gcnew array<String^>(4);
    backgroundWorker1->ReportProgress(10,Received);

报告进度：

private: System::Void backgroundWorker1_ProgressChanged(System::Object^ sender,   System::ComponentModel::ProgressChangedEventArgs^  e)
{
    array<String^>^ Received2 = gcnew array<String^>(4);
    Received2 =(e->UserState);
}

我正在：

错误C2440：'='：无法从'System :: Object ^'转换为'cli :: array

error C2440: '=' : cannot convert from 'System::Object ^' to 'cli::array "

这并不奇怪，但是如何将 UserState 转换并分配给字符串数组？

which is not a surprise, but how to convert and assign UserState to string array?

推荐答案

您需要将对象句柄转换为数组句柄，然后检查nullptr以查看转换是否成功，例如：

You need to cast the object handle to an array handle then check for a nullptr to see if the cast was successful e.g:

array<String^>^ Received2 = dynamic_cast<array<String^>^>(e->UserState);
if (Received2 != nullptr)
{
    // Cast was successful, safe to use Received2.
}
else
{
    // Cast failed, do not use Received2.
}

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