GetProcessioCounters : Error Invalid access to memory location

Question

I am trying to start a process and get GetProcessIoCounters to work without success. I am always getting "Invalid access to memory location". Could anybody give advice.

Here is my code:

  if (!CreateProcessA("c:\\app.exe",NULL,NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi))
    printError(TEXT("CreateProcess Err"));

  PIO_COUNTERS      ioc = 0 ;
  if(!GetProcessIoCounters(hProcess, ioc))
      printError(TEXT("GetProcessIoCounters Err"));
  else          
  {
     wprintf(L"%lu %lu \n", hProcess, ioc->ReadOperationCount);

Answer 1

While is not clear from where you get the process handle hProcess, and supposing that it is correct, in GetProcessIoCounters you must provide a pointer to an existing IO_COUNTERS structure, not just a pointer to it.

Try:

if (!CreateProcessA("c:\\app.exe",NULL,NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi))
    printError(TEXT("CreateProcess Err"));

  IO_COUNTERS ioc = {0} ;
  if(!GetProcessIoCounters(hProcess, &ioc))
      printError(TEXT("GetProcessIoCounters Err"));
  else          
  {
     wprintf(L"%lu %lu \n", hProcess, ioc.ReadOperationCount);