在vc ++中将列表转换为char ** [英] convert list to char** in vc++

问题描述

char **details;
    list->Add(gcnew String("Test String 1"));
    list->Add(gcnew String("Test String 2"));
    list->Add(gcnew String("Test String 3"));

    String^ filterTxt = "two";

    for(int i=0;i<3; i++)
    {
        details[i]=(char*)(void*)Marshal::StringToHGlobalAnsi(list[i]);
        Console::WriteLine(details[i]);
    }
    Console::ReadLine();

上面的代码得到空引用异常，请帮我解决这个问题。

The above code getting the null reference exception, please help me on this.

推荐答案

好吧，也许，如果你为细节分配了一些实际内存，那么错误就会消失？



你将它声明为指向char的指针：

Well, perhaps, if you assigned some actual memory to details the error would go away?

You declared it as a pointer-to-pointer-to char:

char **details;

接下来你要做的就是尝试填充它：

And the next thing you do with it is try to fill it up:

details[i]=(char*)(void*)Marshal::StringToHGlobalAnsi(list[i]);

你真的没有指出任何事情......

At no point do you actually point it at anything...

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