尝试编写Unity iOS插件时出现Malloc错误

Question

尝试编写一个快速的Unity插件以从剪贴板中获取数据时，有问题的函数如下：

extern "C"
    {
        const char * _importString()
        {
            UIPasteboard *result = [UIPasteboard generalPasteboard];
            NSString * resultString = [result string];
            return [resultString UTF8String];
        }
    }

但是，当我激活该功能时，它给了我以下错误：

GfxDevice: creating device client; threaded=1
Initializing Metal device caps: Apple A9 GPU
Initialize engine version: 2017.1.0f3 (472613c02cf7)
2017-08-26 13:46:21.395230+0100 ProductName[8608:2930827] [Common] _BSMachError: port 5e03; (os/kern) invalid capability (0x14) "Unable to insert COPY_SEND"
2017-08-26 13:46:21.400889+0100 ProductName[8608:2930827] [Common] _BSMachError: port 5e03; (os/kern) invalid capability (0x14) "Unable to insert COPY_SEND"
UnloadTime: 4.034333 ms
ProductName(8608,0x1b8100b40) malloc: *** error for object 0x1740a6191: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug

主要使用Unity C Sharp进行编写，因此对iOS插件了解甚少，也不知道从哪里开始，任何帮助都值得赞赏。

编辑：

对于那些在家玩的人，这里是相关的Unity片段：

[DllImport("__Internal")]
private static extern string _importString();

//retrieves the clipboard contents from xcode
public string iPhoneImportClipboard()
{
    return _importString();
}

Answer 1

的结果-string不得视为malloc指针。

您需要先返回malloc一个缓冲区并strcpy说一个字符串。

extern "C"
    {
        const char * _importString()
        {
            UIPasteboard *result = [UIPasteboard generalPasteboard];
            NSString * resultString = [result string];
            return strdup([resultString UTF8String]);
        }
    }