2.1.ReactOS源码分析ReadFile函数分解

2.1.ReactOS源码分析ReadFile函数分解

2.1.ReactOS源码分析ReadFile函数分解

---

ReadFile函数的分析

BOOL WINAPI ReadFile(HANDLE,PVOID,DWORD,PDWORD,LPOVERLAPPED);

ReadFile函数的声明

BOOL STDCALL
ReadFile(IN HANDLE hFile,
         IN LPVOID lpBuffer,
         IN DWORD nNumberOfBytesToRead,
         OUT LPDWORD lpNumberOfBytesRead  OPTIONAL,
         IN LPOVERLAPPED lpOverlapped  OPTIONAL)
{
   
   NTSTATUS Status;

   DPRINT("ReadFile(hFile %x)\n", hFile);

   if (lpNumberOfBytesRead != NULL)
     {
   
        *lpNumberOfBytesRead = 0;
     }

   if (IsConsoleHandle(hFile))
     {
   
	return ReadConsoleA(hFile,
                            lpBuffer,
                            nNumberOfBytesToRead,
                            lpNumberOfBytesRead,
                            NULL);
     }

   if (lpOverlapped