打开或创建文件（mfc &API）

 //SP-A1用CFile来创建文件
 CFile file;
 if(file.Open(L"test1.TXT",CFile::modeReadWrite))
 {
  MessageBox(L"Open File OK");
 }
 else
 {
  file.Open(L"test1.TXT",CFile::modeCreate | CFile::modeReadWrite);
  MessageBox(L"File not exist to create");
 }

 /*
  //SP-A2创建文件2用CreateFile创建文件
  HANDLE g_hFile = 0;                  // Handle to the opened file
  g_hFile = CreateFile(L"test.txt",GENERIC_READ | GENERIC_WRITE,
                          FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,OPEN_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
*/