R3中微软的Silverlight的例子XAMLPERF中的FRM_START,FRM_STOP,FRM_GET_FRAMES_PER_SECOND什么意思?该

R3中微软的Silverlight的例子XAMLPERF中的FRM_START,FRM_STOP,FRM_GET_FRAMES_PER_SECOND什么意思?
这三个东西在main.cpp中定义的:
class FrameRateManager
{
  enum FrameRateMonitorMessage  
  {
  FRM_START = 0,
  FRM_STOP,
  FRM_GET_FRAMES_PER_SECOND
  };

使用如下:
  //Register the message with the host
  HRESULT RegisterMessage()
  {
  HRESULT hr = S_OK;

  m_TestMessage = RegisterWindowMessage(c_FrameRateMessageName);
  CBR(0 != m_TestMessage);

  CHR(static_cast<HRESULT>(SendMessage(m_Hwnd, m_TestMessage, FRM_START, 0)));
  Error:
  return hr;
  }

还有就是:
  // get the current frame rate
  HRESULT
  GetFrameRate(UINT * pFPS)
  {
  HRESULT hr = S_OK;
  DWORD ProcessId = NULL;
   
  HANDLE hRemoteProcess = NULL;
  VOID* pResultBuffer = NULL;
  float Result = 0.0;
   
  // Get a handle to the EXR process containing the target HWND
  GetWindowThreadProcessId(m_Hwnd, &ProcessId);
  hRemoteProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, ProcessId);
   
  // Allocate memory in the EXR process to marshal the fps counter over to this process
  pResultBuffer = VirtualAllocEx(hRemoteProcess, NULL, sizeof(FLOAT), MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
  CPR(pResultBuffer);
   
  hr = static_cast<HRESULT>(SendMessage(m_Hwnd, m_TestMessage, FRM_GET_FRAMES_PER_SECOND, (LPARAM)pResultBuffer));
  CHR(hr);
   
  // Read back EXR's response
  CBREx(ReadProcessMemory(hRemoteProcess, pResultBuffer, (LPVOID)(&Result), sizeof(FLOAT), NULL), GetLastErrorHR());
   
  if (pFPS)
  {
  *pFPS = (UINT)Result;
  }
   
  Error:
  if (pResultBuffer)
  {
  VirtualFreeEx(hRemoteProcess, pResultBuffer, 0, MEM_RELEASE);
  }

  return hr;
  }


=======================================================
CHR(static_cast<HRESULT>(SendMessage(m_Hwnd, m_TestMessage, FRM_START, 0)));

hr = static_cast<HRESULT>(SendMessage(m_Hwnd, m_TestMessage, FRM_GET_FRAMES_PER_SECOND, (LPARAM)pResultBuffer));

把这两个消息发出去,我看的比较迷茫一个.
我猜测这应该是Silverlight的内部实现的.但是MSDN中没有,不知道如何整.
资料太少了...水平不行啊...


[解决办法]
http://www.cnblogs.com/wangkewei/archive/2009/12/24/1631644.html

楼主问问博主吧，他好像对Silverlight非常熟悉。