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windows下串口通信同步与异步方式

/ Published in: C
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  1. #include <iostream>
  2. #include <windows.h>
  3. #include <assert.h>
  4.  
  5. using namespace std;
  6.  
  7. HANDLE g_hCom = INVALID_HANDLE_VALUE;
  8. const unsigned MAX_BUF_LEN = 32;
  9. const char* const g_pData = "hello";
  10.  
  11.  
  12. DWORD WINAPI ThreadRead( LPVOID lpParameter )
  13. {
  14.     char szBuf[ MAX_BUF_LEN ] = { 0 };
  15.     DWORD dwRead;
  16.     if( !ReadFile( g_hCom, szBuf, strlen( g_pData ), &dwRead, NULL ) )
  17.     {
  18.         cout << "Read com failed." << endl;
  19.         return 0;
  20.     }
  21.     if( dwRead != strlen( g_pData ) )
  22.     {
  23.         cout << "Failed to get all the data." << endl;
  24.         return 0;
  25.     }
  26.     cout << "Read: " << szBuf << endl;
  27.     return 1;
  28. }
  29.  
  30.  
  31. int main()
  32. {
  33.     g_hCom = CreateFile( "com1", GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL );
  34.     assert( g_hCom != INVALID_HANDLE_VALUE );
  35.  
  36.     HANDLE hThread = CreateThread( NULL, 0, ThreadRead, NULL, 0, NULL );
  37.     assert( hThread );
  38.  
  39.     Sleep( 100 );
  40.  
  41.     DWORD dwWritten;
  42.     if( !WriteFile( g_hCom, g_pData, strlen( g_pData ), &dwWritten, NULL ) )
  43.     {
  44.         cout << "Write com failed." << endl;
  45.         return 0;
  46.     }
  47.     if( dwWritten != strlen( g_pData ) )
  48.     {
  49.         cout << "Failed to write all the data." << endl;
  50.         return 0;
  51.     }
  52.     cout << "Write: " << g_pData << endl;
  53.     return 1;
  54. }

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