C语言 写文件样例

HANDLE hf = CreateFile("d:/a.txt",GENERIC_WRITE | GENERIC_READ,FILE_SHARE_WRITE,NULL,CREATE_ALWAYS,FILE_ATTRIBUTE_NORMAL,NULL);
     DWORD dwCount;
     char* str ="test\r\n";
     int len =strlen(str);
     WriteFile(hf, str, len, &dwCount, NULL);
     CloseHandle(hf);