Windows file: using both ReadFile and mapping

Question

Suppose I have a file on disk and then create its handle using CreateFile , its mapping object using CreateFileMapping , its mapping view using MapViewOfFile . The start of the file address in virtual memory is held in pointer StartPtr which was returned by MapViewOfFile function. If, before calling CreateFileMapping function, I use ReadFile to read some bytes N , would be the pointer returned by MapViewOfFile point to ( StartPtr + N ) ?

Answer 1

No. MapViewOfFile() requires you telling it where the view is mapped relative from the start of the file. Specified in the dwFileOffset arguments. If you need it to work this way then simply use SetFilePointerEx() with a zero move to obtain the current position.

Answer 2

不， ReadFile仅移动磁盘文件指针。