refactor: open 方法增加返回值

Author: ArgoZhang

src/BootstrapBlazor/Services/MediaDevices/DefaultMediaDevices.cs

@@ -21,10 +21,10 @@ private async Task<JSModule> LoadModule()
         return await module.InvokeAsync<List<MediaDeviceInfo>?>("enumerateDevices");
     }
 
-    public async Task Open(MediaTrackConstraints constraints)
+    public async Task<bool> Open(MediaTrackConstraints constraints)
     {
         var module = await LoadModule();
-        await module.InvokeVoidAsync("open", constraints);
+        return await module.InvokeAsync<bool>("open", constraints);
     }
 
     public async Task Close(string? videoSelector)

src/BootstrapBlazor/Services/MediaDevices/DefaultVideoDevice.cs

@@ -22,7 +22,7 @@ class DefaultVideoDevice(IMediaDevices deviceService) : IVideoDevice
         return ret;
     }
 
-    public Task Open(MediaTrackConstraints constraints)
+    public Task<bool> Open(MediaTrackConstraints constraints)
     {
         return deviceService.Open(constraints);
     }

src/BootstrapBlazor/Services/MediaDevices/IMediaDevices.cs

@@ -21,7 +21,7 @@ public interface IMediaDevices
     /// </summary>
     /// <param name="constraints"></param>
     /// <returns></returns>
-    Task Open(MediaTrackConstraints constraints);
+    Task<bool> Open(MediaTrackConstraints constraints);
 
     /// <summary>
     /// The close() method of the MediaDevices interface stops capturing media from the specified device and closes the MediaStream object.

src/BootstrapBlazor/Services/MediaDevices/IVideoDevice.cs

@@ -21,7 +21,7 @@ public interface IVideoDevice
     /// </summary>
     /// <param name="constraints"></param>
     /// <returns></returns>
-    Task Open(MediaTrackConstraints constraints);
+    Task<bool> Open(MediaTrackConstraints constraints);
 
     /// <summary>
     /// Close the video device with the specified selector.

src/BootstrapBlazor/wwwroot/modules/media.js

@@ -29,16 +29,25 @@ export async function open(options) {
     if (height) {
         constrains.video.height = { ideal: height };
     }
-    const stream = await navigator.mediaDevices.getUserMedia(constrains);
-    const media = registerBootstrapBlazorModule("MediaDevices");
-    media.stream = stream;
 
-    if (videoSelector) {
-        const video = document.querySelector(videoSelector);
-        if (video) {
-            video.srcObject = stream;
+    let ret = false;
+    try {
+        const stream = await navigator.mediaDevices.getUserMedia(constrains);
+        const media = registerBootstrapBlazorModule("MediaDevices");
+        media.stream = stream;
+
+        if (videoSelector) {
+            const video = document.querySelector(videoSelector);
+            if (video) {
+                video.srcObject = stream;
+            }
         }
+        ret = true;
+    }
+    catch (err) {
+        console.error("Error accessing media devices.", err);
     }
+    return ret;
 }
 
 export async function close(videoSelector) {