搭建PVB架构，实现前端的基础布局、菜单、表格、图示等功能

2026-05-27 18:59:26 +08:00 · 2025-08-20 19:00:22 +08:00
parent 5de7687bcc
commit 7e965b6fb4
142 changed files with 28270 additions and 411 deletions
--- a/libs/pvb/include/rllib/rlspawn.h
+++ b/libs/pvb/include/rllib/rlspawn.h
@@ -0,0 +1,169 @@
+/***************************************************************************
+                          rlspawn.h  -  description
+                             -------------------
+    begin                : Tue Jan 02 2001
+    copyright            : (C) 2001 by R. Lehrig
+    email                : lehrig@t-online.de
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   This library is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU LESSER GENERAL PUBLIC LICENSE as        *
+ *   published by the Free Software Foundation                             *
+ *                                                                         *
+ ***************************************************************************/
+#ifndef _RL_SPAWN_H_
+#define _RL_SPAWN_H_
+
+#include "rldefine.h"
+
+#ifndef RLUNIX
+//#warning This Functionality is only available under Linux/Unix
+/*
+http://msdn.microsoft.com/en-us/library/windows/desktop/aa365574%28v=vs.85%29.aspx
+http://www.tenouk.com/cpluscodesnippet/pipeandchildprocess.html
+http://msdn.microsoft.com/en-us/library/windows/desktop/aa365780%28v=vs.85%29.aspx
+
+GetFileNameFromHandle
+http://msdn.microsoft.com/en-us/library/windows/desktop/aa366789%28v=vs.85%29.aspx
+*/
+#endif
+
+/*! <pre>
+Spawn an external program.
+Redirect \<stdin> \<stdout> \<stderr> of external program to this class
+
+Now you can communicate with this external program over a pipe.
+Attention: This class is only available on unix like systems.
+</pre> */
+class rlSpawn
+{
+public:
+  rlSpawn();
+  virtual ~rlSpawn();
+
+  /*! <pre>
+  Start an operating system command.
+  The output from the command can be read with readLine()
+  You can write to the program with writeString() or write()
+  Return: 0=success -1=error
+  </pre> */
+  int spawn(const char *command);
+
+  /*! <pre>
+  Read a line from the spawned command.
+  When the command terminates NULL is returned.
+  </pre> */
+  const char *readLine();
+
+  /*! <pre>
+  Read a char from the spawned command.
+  When the command terminates EOF is returned.
+  </pre> */
+  int getchar();
+
+  /*! <pre>
+  Wait for characters.
+  return = 0 // timeout
+  return = 1 // characters available
+  </pre> */
+  int select(int timeout=50);
+
+  /*! <pre>
+  Write buf to \<stdin> of spawned command
+  buf must be 0 terminated
+  Return: number of bytes written
+          -1 error
+  </pre> */
+  int writeString(const char *buf);
+
+  /*! <pre>
+  Write buf to \<stdin> of spawned command
+  Return: number of bytes written
+          -1 error
+  </pre> */
+  int write(const char *buf, int len);
+
+  /*! <pre>
+  similar to printf
+  Return: number of bytes written
+          -1 error
+  </pre> */
+  int printf(const char *format, ...);
+
+  /*! <pre>
+  Print all outputs from spawned command to \<stdout>
+  </pre> */
+  void printAll();
+
+  /*! <pre>
+  Get FILE pointer fromChild
+  </pre> */
+  FILE *getFilepointer();
+
+  /*! <pre>
+  Kill process on other side of pipe
+  </pre> */
+  int sigkill();
+
+  /*! <pre>
+  Read JPEG buffer fromChild
+  return: length of buffer | -1 as error
+
+  Example: A thread continiously reads the mjpeg output of ffmpeg and stores it in jpegBuffer
+
+  rlThread mythread;
+  unsigned char jpegBuffer[256*256*16];
+
+  void *myThread(void *arg) // define your thread function
+  {
+    rlSpawn spawn;
+
+    restart:  
+    if(arg == NULL) return NULL;
+        
+    THREAD_PARAM  *p = (THREAD_PARAM *) arg;
+    //myThreadsData *d = (myThreadsData *) p->user;
+    spawn.spawn("ffmpeg -f video4linux2 -i /dev/v4l/by-id/usb-046d_0825_A867B3D0-video-index0 -vf \"transpose, hflip\" -r 10 -f mjpeg pipe:1");  
+    while(p->running)
+    {
+      int ret = spawn.readJpegBuffer(jpegBuffer,sizeof(jpegBuffer));
+      printf("ret=%d\n",ret);
+      if(ret < 0) goto restart;
+    }
+    return arg;
+  }
+
+  Example: The jpegBuffer can now be Send to a Image Widget on the pvbrowser client
+ 
+  extern rlThread mythread;
+  extern unsigned char jpegBuffer[];
+
+  static int slotNullEvent(PARAM *p, DATA *d)
+  {
+    if(p == NULL || d == NULL) return -1;
+    pvSendJpegFrame(p,imgWebcam,jpegBuffer);
+    return 0;
+  }
+
+  </pre> */
+  int readJpegBuffer(unsigned char *buffer, int maxbuffer);
+
+  int pid;
+
+private:
+#ifdef RLWIN32
+  HANDLE toChildRD;
+  HANDLE toChildWR;
+  HANDLE fromChildRD;
+  HANDLE fromChildWR;
+  HANDLE hThread;
+  HANDLE hProcess;
+#else
+  void *toChild,*fromChild;
+#endif  
+  char line[4096]; // adjust this if the buffer is not big enough
+};
+
+#endif