从Unity调用浏览器上的javascript字符串函数返回null [英] Calling javascript string function on browser from Unity returns null
问题描述
我有一个WebGL统一项目,试图在浏览器上执行javascript代码并返回一个值。
I have a WebGL unity project which attempts to execute javascript code on the browser and return a value.
我有以下 .jslib
我的Assets / Plugins / WebGL文件夹中的文件:
I have the following .jslib
file in my Assets/Plugins/WebGL folder:
var BrowserPlugin = {
GetEndpointURL: function()
{
var endpoint = window.itd.getEndpointUrl();
console.log("endpoint: " + endpoint);
return endpoint;
}
};
mergeInto(LibraryManager.library, BrowserPlugin);
在我的c#代码中,我导入dll并调用我的javascript方法,如下所示:
In my c# code in unity, I import the dll and call my javascript method like so:
[DllImport("__Internal")]
private static extern string GetEndpointURL();
string endpointURL = GetEndpointURL();
问题是,在我的c#代码中 endpointUrl
变量始终为null。但是,在我的浏览器控制台中,我可以清楚地看到在返回之前在浏览器javascript中记录了正确的值。是什么导致这个值回到统一为null?
The problem is, in my c# code the endpointUrl
variable is always null. However, in my browser console, I can clearly see the correct value is logged in the browser javascript before I return it. What is causing this value to come back to unity as null?
推荐答案
这是你的代码:
GetEndpointURL: function()
{
var endpoint = window.itd.getEndpointUrl();
console.log("endpoint: " + endpoint);
return endpoint;
}
你不能返回字符串(端点
)直接。您必须创建一个缓冲区来保存该字符串,此过程包括使用 _malloc
分配内存并使用 writeStringToMemory将旧字符串复制到该新内存位置
。
You cannot return string (endpoint
) directly. You have to create a buffer to hold that string and this process includes allocating memory with _malloc
and copying old string to that new memory location with writeStringToMemory
.
GetEndpointURL: function()
{
var endpoint = window.itd.getEndpointUrl();
console.log("endpoint: " + endpoint);
var buffer = _malloc(lengthBytesUTF8(endpoint) + 1);
writeStringToMemory(endpoint, buffer);
return buffer;
}
这篇关于从Unity调用浏览器上的javascript字符串函数返回null的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!