CreateFile(), GetFileType(), GetBinaryType(), CloseHandle()


Compiler: Visual C++ Express Edition 2005

Compiled on Platform: Windows XP Pro SP2

Header file: Standard and Windows

Additional library: Windows Platform SDK

Additional project setting: Set project to be compiled as C

Project -> your_project_name Properties -> Configuration Properties -> C/C++ -> Advanced -> Compiled As: Compiled as C Code (/TC)

Other info: non-CLR or unmanaged

To do: Checking a file type

To show: Using CreateFile(), GetFileType(), GetBinaryType(), CloseHandle() C functions





#include <windows.h>

#include <stdio.h>


int main(void)


// handle for file


DWORD lpBinaryType[100];

// file and path, make sure the file is there...

LPCWSTR fname = L"c:\\test.doc";

// Windows XP PRo, change accordingly, the file is there

LPCWSTR fname2 = L"c:\\windows\\NOTEPAD.EXE";


hFile = CreateFile(fname, //file to be opened

GENERIC_READ, //open for reading

FILE_SHARE_READ, //share for reading

NULL, //default security

OPEN_EXISTING, //open existing file

FILE_ATTRIBUTE_READONLY, //the file is read only

NULL); //no attribute template



printf("Could not open %s file, error %d\n", fname, GetLastError());


printf("%S file opened successfully.\n", fname);


printf("File's HANDLE is OK!\n");

if(GetFileType(hFile) == 0)

printf("The %S file is character type.\n", fname);

else if (GetFileType(hFile) == 1)

printf("The %S file is disk file.\n", fname);

else if (GetFileType(hFile) == 2)

printf("The %S file is socket or named pipe.\n", fname);

else if (GetFileType(hFile) == 4)

printf("The %S file is UNKNOWN type or GetFileType() failed!\n", fname);



if(GetBinaryType(fname2, lpBinaryType) != 0)

printf("The %S file is executable.\n", fname2);


printf("The %S is file non-executable.\n", fname2);

return 0;



Output example:


c:\test.doc file opened successfully.

File's HANDLE is OK!

The c:\test.doc file is disk file.

The c:\windows\NOTEPAD.EXE file is executable.

Press any key to continue . . .



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