面对一个名为“错误C2228：左边的'.substr'的问题错误必须有class / struct / union” [英] Facing a issue error called "error C2228: left of '.substr' must have class/struct/union"

问题描述

我是c ++的新手......我想将一个字符串分成两个相等的部分。我收到构建错误

I am new to c++ ... i want to split a string into two equal parts . I am getting the build error

" C2228: left of '.substr' must have class/struct/union"

我尝试过：



void Divide（String ^ messageText）

{

int length = sizeof（messageText）;

int sublength = length / 2;

String ^ FirstString;

FirstString = messageText.substr（0，sublength）;

}

What I have tried:

void Divide(String^ messageText)
{
int length = sizeof(messageText);
int sublength = length/2;
String ^FirstString;
FirstString = messageText.substr (0,sublength);
}

推荐答案

此处描述了上述错误的原因：编译器错误C2228 [ ^ ]。点击链接找出原因。

The reason of above error is described here: Compiler Error C2228[^]. Follow the link to find out what causes it.

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