周遊執行緒清單

此程式碼範例會列出指定進程的執行中線程。 首先， ListProcessThreads 函 式會擷取系統中目前執行中線程的快照集。 若要這樣做，它會使用 CreateToolhelp32Snapshot 函式，然後逐步解說使用 Thread32First 和 Thread32Next 函式在快照集中記錄的清單。 ListProcessThreads 的參數 是要列出其執行緒的進程進程識別碼。

若要遵循程式碼範例，請使用 Visual Studio 從 C++ 主控台應用程式 專案範本建立新專案，並將下列程式碼新增至其中。

#include <windows.h>
#include <tlhelp32.h>
#include <tchar.h>

//  Forward declarations:
BOOL ListProcessThreads( DWORD dwOwnerPID );
void printError( TCHAR const* msg );

int main( void )
{
  ListProcessThreads(GetCurrentProcessId() );
  return 0;
}

BOOL ListProcessThreads( DWORD dwOwnerPID ) 
{ 
  HANDLE hThreadSnap = INVALID_HANDLE_VALUE; 
  THREADENTRY32 te32; 
 
  // Take a snapshot of all running threads  
  hThreadSnap = CreateToolhelp32Snapshot( TH32CS_SNAPTHREAD, 0 ); 
  if( hThreadSnap == INVALID_HANDLE_VALUE ) 
    return( FALSE ); 
 
  // Fill in the size of the structure before using it. 
  te32.dwSize = sizeof(THREADENTRY32 ); 
 
  // Retrieve information about the first thread,
  // and exit if unsuccessful
  if( !Thread32First( hThreadSnap, &te32 ) ) 
  {
    printError( TEXT("Thread32First") );  // Show cause of failure
    CloseHandle( hThreadSnap );     // Must clean up the snapshot object!
    return( FALSE );
  }

  // Now walk the thread list of the system,
  // and display information about each thread
  // associated with the specified process
  do 
  { 
    if( te32.th32OwnerProcessID == dwOwnerPID )
    {
      _tprintf( TEXT("\n     THREAD ID      = 0x%08X"), te32.th32ThreadID ); 
      _tprintf( TEXT("\n     base priority  = %d"), te32.tpBasePri ); 
      _tprintf( TEXT("\n     delta priority = %d"), te32.tpDeltaPri ); 
    }
  } while( Thread32Next(hThreadSnap, &te32 ) );

  _tprintf( TEXT("\n"));

//  Don't forget to clean up the snapshot object.
  CloseHandle( hThreadSnap );
  return( TRUE );
}

void printError( TCHAR const* msg )
{
  DWORD eNum;
  TCHAR sysMsg[256];
  TCHAR* p;

  eNum = GetLastError( );
  FormatMessage( FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
         NULL, eNum,
         MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
         sysMsg, 256, NULL );

  // Trim the end of the line and terminate it with a null
  p = sysMsg;
  while( ( *p > 31 ) || ( *p == 9 ) )
    ++p;
  do { *p-- = 0; } while( ( p >= sysMsg ) &&
                          ( ( *p == '.' ) || ( *p < 33 ) ) );

  // Display the message
  _tprintf( TEXT("\n  WARNING: %s failed with error %d (%s)"), msg, eNum, sysMsg );
}

相關主題

• 執行緒行走