WinAPI source codes

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I present you a small collection of miscellaneous WinAPI source codes . Feel free to PM me If you have any suggestions or spotted a bug in the code.

Dll injection
Get disk size
Drive letter changer
Associate file extension with a program
NtQuerySystemInformation

DLL injection example

Shows how to inject a DLL into process. Project includes a simple DLL and a HelloWorld application for testing.

Download (CodeBlocks project)

Get disk size

This simple application shows how to use DeviceIOControl() and IOCTL_DISK_GET_LENGTH_INFO to get disk or partition size.
If you don't need a fully working app, you can use this function:

//
// GetDisk or or partition size
// dsk can be \\\\.\\PhysicalDrive0 or \\\\.\\C:
//
uint64_t GetDiskLengthIoctl(const char *dsk)
{
  HANDLE hDisk=CreateFile(dsk,GENERIC_READ,FILE_SHARE_VALID_FLAGS,0,OPEN_EXISTING,0,0);
  if(hDisk==INVALID_HANDLE_VALUE)
    {
      cerr<<"Could not open the disk. GetLastError() returned "<<GetLastError()<<endl;
      return 0;
    }
  GET_LENGTH_INFORMATION gli;
  DWORD ret;

  DeviceIoControl(hDisk,IOCTL_DISK_GET_LENGTH_INFO,0,0,&gli,sizeof(gli),&ret,0);

  CloseHandle(hDisk);
  return gli.Length.QuadPart;
}

Download (CodeBlocks project)

Drive letter changer

A simple program that shows how to use SetVolumeMountPoint to change drive letters

Download (CodeBlocks project)

Associate file extension with a program

Download (CodeBlocks project)

NtQuerySystemInformation examples

.zip file includes three separate projects that show how to use NtQuerySystemInformation() function to..

get list of all running processes
display some information about physical memory (page size, number of physical pages) and number of processors
display number of disks, serial ports, CdRoms

Download (CodeBlocks projects)

Attachments: [CodeInject.zip] [drive_letter_changer.zip] [ext_assoc.zip] [get_disk_size.zip] [nt_query_system_information.zip]