As we all know, in the Microsoft operating system to write applications, the most important thing is through the windows provided by the API functions to achieve a variety of operations, these functions are usually directly available, as long as the windows.h this header file is included. Today we mainly introduce a few common API functions, through which we can get information about the user's disk. Sample program: Please click on the attachment download. The main function prototypes are described below: 1. Get the number of logical drives in the system The getlogicaldrives function retrieves a bitmask representing the currently available disk drives. DWORD getlogicaldrives (void);
2. Get all drive string information The GetLogicalDriveStrings function fills a buffer with strings this specify valid drives in the system. DWORD GetLogicalDriveStrings (
DWORD Nbufferlength,
LPTSTR lpbuffer
); 3. Get the Drive type The GetDriveType function determines whether a disk drive is a removable, fixed, CD-ROM, RAM disk, or network drive. UINT GetDriveType (
LPCTSTR lpRootPathName
); 4. Gets the space state of the drive disk, and the function returns a bool type of data The GetDiskFreeSpaceEx function retrieves information about the amount of space available on a disk volume:the total Amou NT of space, the total amount of free space, and the total amount of free space available to the user associated with the Calling thread. BOOL GetDiskFreeSpaceEx (
LPCTSTR Lpdirectoryname,
Pularge_integer lpfreebytesavailable,
Pularge_integer Lptotalnumberofbytes,
Pularge_integer lptotalnumberoffreebytes
); The following is the complete sample program code: 2 back top #include<Iostream>
#include<Windows.h>
Usingnamespace Std;
IntMain ()
{
IntDiskcount = 0;
DWORDDiskInfo =GetLogicalDrives ();
UseGetLogicalDrives() function can get the number of logical drives in the system, and the function returns a32-bit unsigned integer data.
WhileDiskInfo)//To see if each bit of data is1, if the1 The disk is True, if the0 The disk does not exist.
{
if (diskinfo&1)//Through the logic and operation of the bitwise operation, determine whether the1
{
++Diskcount;
}
DiskInfo =DiskInfo >> 1;//The right shift of the bitwise operation ensures that each loop is checked to the right one bit at a time.
//DiskInfo = DISKINFO/2;
}
cout<< "Number of logical disks: "<<diskcount<<Endl
//-------------------------------------------------------------------
IntDslength =GetLogicalDriveStrings (0,null);
PassGetLogicalDriveStrings() function to obtain the length of all drive string information.
char*Dstr = new char[dslength];//creates a heap area with the obtained lengthC-style string array
GetLogicalDriveStrings (Dslength, (LPTSTR)DSTR);
PassGetLogicalDriveStrings copying string information into a heap array, which holds information for all drives.
IntDType;
Intsi=0;
BOOLFresult;
unsigned _int64 i64freebytestocaller;
unsigned _int64 i64totalbytes;
unsigned _int64 i64freebytes;
ForIntI=0;i<dslength/4;++i)
In order to show the status of each drive, it is implemented through the loop output becauseThe data stored inside the DSTR isA:\nullb:\nullc:\null, such a message, soDSLENGTH/4 can obtain specific cycle range
{
Char dir[3]={dstr[Si], ': ', ' \ \ '};
cout<<dir;
DType =GetDriveType (DSTR+I*4);
//GetDriveType function, you can get the drive type, the parameter is the root directory of the drive
IfDType = = drive_fixed)
{
cout<< "hdd";
}
else if (DType = = Drive_cdrom)
{
cout<< "Optical Drive";
}
else if (DType = = drive_removable)
{
cout<< "Removable disk";
}
else if (DType = = drive_remote)
{
cout<< "Network disk";
}
else if (DType = = Drive_ramdisk)
{
cout<< "virtualRAM Disk";
}
else if (DType = = Drive_unknown)
{
cout<< "Unknown Device";
}
Fresult =GetDiskFreeSpaceEx (
Dir
(Pularge_integer) &i64freebytestocaller,
(Pularge_integer) &i64totalbytes,
(Pularge_integer) &i64freebytes);
//GetDiskFreeSpaceEx function to get the space state of the drive disk, the function returns aBOOL Type data
IfFresult)//by returning theBOOL data determines if the drive is in a working state
{
cout<< "Totalspace: "<< (float) i64totalbytes/1024/1024<<" MB ";//Disk Total capacity
cout<< "FreeSpace: "<< (float) i64freebytestocaller/1024/1024<<" MB ";//Disk space remaining
}
else
{
cout<< " Device not ready }
cout<<ENDL;
si+=4;
}
system ("pause");
/span> The WIN API functions as a programming interface in the Windows operating system environment, in other languages, such as VB vb.net C # Delphi in the use of the method of operation is similar, specific reference to the relevant language books. |
