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What is the relationship between the Windows API and the C runtime library?

What is the relationship between the Windows API and the C runtime library?

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In short: The Windows API contains all the functions specifically defined for Windows. The C runtime library contains all the functions that are required by standard C.

Physical libraries implementing these functions can be a single file (library), divided into two separate libraries or divided into many libraries, depending on the operating system and the actual API / service that you use.

For example, when creating files, the C standard includes a function:

fopen

for opening and creating files, etc., while the Win32 API (for example) defines functions such as:

CreateFile

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EDIT: DLL , , , :

kernel32.dll depends on:
  ntdll.dll

user32.dll depends on:
  gdi32.dll
  kernel32
  ntdll.dll
  advapi.dll
  msimg32.dll
  powerprof.dll (this dll references msvcrt.dll for some string functions)
  winsta.dll

msvcrt.dll depends on:
  kernel32.dll (yes it does have imports for CreateFileA)
  ntdll.dll

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C Windows API

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Unix Windows API.

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