DLL的入口点函数

1 DLL入口点函数

dll可以包含一些入口点函数，这些函数是具有通知性质的，通常是DLL执行一些进程或线程相关的初始化or清理工作时触发的。一般可以这么写

//入口点函数
BOOL WINAPI DllMain(HINSTANCE hInstDll, DWORD fdwReason, PVOID FImpLoad) {
  {
      case DLL_PROCESS_ATTACH:
      //The DLL is mapped into the process' address space
      break;

      case DLL_THREAD_ATTACH:
      //A thread is being created
      break;

      case DLL_THREAD_DETACH:
      // A thread is exiting cleanly.
      break;

      case DLL_PROCESS_DETACH:
      // The DLL is beign unmapped from the process' address space
      break;
  }
  return (TRUE); // Used only for DLL_PROCESS_ATTACH
}
"""参数说明
1. hInstDll:DLL实例的句柄，一个虚拟内存地址
2. fdwReason:调入的原因，也就是触发通知的原因
3. FImpload:显式载入为0，隐式载入为非零
"""

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