how to read full file WINAPI

[scrim]

hello, ive been trying to read a whole file with ReadFile() function. but how do i know how large the buffer needs to be? is there any way to calculate that?


example:

ReadFile(hFile, fileBuffer, BUFFERSIZE, &dwRead, 0);

 

[DildoFagins]

but how do i know how large the buffer needs to be? is there any way to calculate that?

GetFileSizeEx function (fileapi.h) - Win32 apps

Retrieves the size of the specified file.

docs.microsoft.com

 

[scrim]

GetFileSizeEx function (fileapi.h) - Win32 apps

Retrieves the size of the specified file.

docs.microsoft.com

and how much do i need to add to the buffer?

BYTE fileBuffer[????? file size?];

 

[DildoFagins]

and how much do i need to add to the buffer?

You can't have the static buffer, you need to allocate one with HeapAlloc. You just pick the size that was returned to you by GetFileSizeEx and allocate that size with HeapAlloc. Don't forget to free the buffer with HeapFree, when the buffer is not needed anymore.

 

[scrim]

You can't have the static buffer, you need to allocate one with HeapAlloc. You just pick the size that was returned to you by GetFileSizeEx and allocate that size with HeapAlloc. Don't forget to free the buffer with HeapFree, when the buffer is not needed anymore.

thanks