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Unity webgl 获取图片或视频数据

news 来源：原创 2025/4/20 5:36:18

WebFilePicker.jslib (放在Plugins目录)

var WebFilePickerLibrary = {/*** 从浏览器中获取文件并发送给 Unity WebGL 应用程序。* @param {number} objectNamePtr - Unity 对象名称的指针。* @param {number} funcNamePtr - Unity 回调函数名称的指针。* @param {number} fileTypePtr - 允许的文件类型字符串的指针。* @param {number} allowMultiple - 是否允许多选（1 表示允许多选，0 表示单选）。* @param {number} maxSizeMB - 文件大小限制（单位：MB）。如果 <=0，则无限制。*/getFileFromBrowser: function(objectNamePtr, funcNamePtr, fileTypePtr, allowMultiple, maxSizeMB) {var objectName = UTF8ToString(objectNamePtr);var funcName = UTF8ToString(funcNamePtr);var fileType = UTF8ToString(fileTypePtr);var maxSizeBytes = maxSizeMB > 0 ? maxSizeMB * 1048576 : 0;var input = document.createElement("input");input.type = "file";input.multiple = !!allowMultiple; // 转换为布尔值input.accept = fileType;input.style.display = "none";/*** 处理通用文件* @param {File[]} files - 用户选择的文件列表。*/var handleFiles = function(files) {var results = [];var filesProcessed = 0;for (let i = 0; i < files.length; i++) {const file = files[i];// 检查文件大小限制if (maxSizeBytes > 0 && file.size > maxSizeBytes) {SendMessage(objectName, funcName,`error:File '${file.name}' exceeds limit (${(file.size / 1048576).toFixed(1)}MB/${maxSizeMB}MB)`);return;}const reader = new FileReader();reader.onload = (e => {results.push({name: file.name,type: file.type,data: new Uint8Array(e.target.result)});filesProcessed++;// 所有文件处理完毕时发送结果if (filesProcessed === files.length) {var resultData = results.map(result => {return {name: result.name,type: result.type,data: Array.from(result.data)};});SendMessage(objectName, funcName, JSON.stringify(resultData));}});reader.readAsArrayBuffer(file);}};// 监听文件选择事件input.addEventListener('change', function(evt) {const files = evt.target.files;if (!files || files.length === 0) {SendMessage(objectName, funcName, "error:No file selected");return;}handleFiles(files);});// 触发文件选择对话框document.body.appendChild(input);input.click();document.body.removeChild(input);}
};mergeInto(LibraryManager.library, WebFilePickerLibrary);

WebFilePicker.cs

using System;namespace MYTOOL
{[Serializable]public class FileResult{public string name;     // 文件名称public string type;    // MIME 类型public byte[] data;    // 二进制数据}/// <summary>/// 提供与Unity WebGL平台交互的方法，用于从浏览器中获取文件(图片、视频或其他类型)/// </summary>public static class WebFilePicker{public const string IMAGE_FILE_TYPE = "image/*";public const string VIDEO_FILE_TYPE = "video/*";#if UNITY_WEBGL[System.Runtime.InteropServices.DllImport("__Internal")]private static extern void getFileFromBrowser(string objName, string methodName, string fileType, bool allowMultiple, int maxSizeMB);
#endif/// <summary>/// 从浏览器中获取图片文件/// </summary>/// <param name="objName">Unity对象名称</param>/// <param name="methodName">Unity回调方法名称</param>/// <param name="maxSizeMB">文件大小限制。如果为0则无限制</param>public static void GetImageFromBrowser(string objName, string methodName, int maxSizeMB = 0){GetFileFromBrowser(objName, methodName, IMAGE_FILE_TYPE, maxSizeMB);}/// <summary>/// 从浏览器中获取多个图片文件/// </summary>/// <param name="objName">Unity对象名称</param>/// <param name="methodName">Unity回调方法名称</param>/// <param name="maxSizeMB">文件大小限制。如果为0则无限制</param>public static void GetImagesFromBrowser(string objName, string methodName, int maxSizeMB = 0){GetFilesFromBrowser(objName, methodName, IMAGE_FILE_TYPE, maxSizeMB);}/// <summary>/// 从浏览器中获取视频文件/// </summary>/// <param name="objName">Unity对象名称</param>/// <param name="methodName">Unity回调方法名称</param>/// <param name="maxSizeMB">文件大小限制。如果为0则无限制</param>public static void GetVideoFromBrowser(string objName, string methodName, int maxSizeMB = 0){GetFileFromBrowser(objName, methodName, VIDEO_FILE_TYPE, maxSizeMB);}/// <summary>/// 从浏览器中获取任意类型的文件/// </summary>/// <param name="objName">Unity对象名称</param>/// <param name="methodName">Unity回调方法名称</param>/// <param name="fileType">文件类型</param>/// <param name="maxSizeMB">文件大小限制。如果为0则无限制</param>public static void GetFileFromBrowser(string objName, string methodName, string fileType, int maxSizeMB = 0){
#if UNITY_WEBGL && !UNITY_EDITORgetFileFromBrowser(objName, methodName, fileType, false, maxSizeMB);
#elseUnityEngine.Debug.LogError("only implemented for WebGL platform.");
#endif}/// <summary>/// 从浏览器中获取多个任意类型的文件/// </summary>/// <param name="objName">Unity对象名称</param>/// <param name="methodName">Unity回调方法名称</param>/// <param name="fileType">文件类型</param>/// <param name="maxSizeMB">文件大小限制。如果为0则无限制</param>public static void GetFilesFromBrowser(string objName, string methodName, string fileType, int maxSizeMB = 0){
#if UNITY_WEBGL && !UNITY_EDITORgetFileFromBrowser(objName, methodName, fileType, true, maxSizeMB);
#elseUnityEngine.Debug.LogError("only implemented for WebGL platform.");
#endif}}
}