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Страница 21 из 24
47)---------------------------------------------------------------------------
Q> Как поменять default принтер? A>
int CALLBACK WinMain( HINSTANCE hInst, HINSTANCE hPrevInst,
LPSTR lpCmdLine, int nShowCmd )
{
/* Get the port & device settings for the specified printer */
char szDeviceString[260];
/* First (and only) parameter is the printer name */
lstrcpy( szDeviceString, __argv[1] );
const int Pos = lstrlen( szDeviceString );
/* Append a ',' */
szDeviceString[ Pos ] = ',';
GetProfileString( "Devices", __argv[1], "",
&szDeviceString[Pos+1],
sizeof( szDeviceString ) - (Pos+1) );
/* Have we got the printer? */
if ( szDeviceString[Pos+1] != '\0' )
{
/* Set the default printer */
WriteProfileString( "windows", "device", szDeviceString );
SendMessageTimeout( HWND_BROADCAST, WM_SETTINGCHANGE, 0L,
(LPARAM)(LPCTSTR)"windows", SMTO_NORMAL,
1000, NULL );
}
else
{
MessageBox( NULL, "Printer not found",
"Set Default Printer Utility",
MB_OK | MB_ICONERROR );
}
return 0;
}
References and samples:
Knowledge Base Article Q135387: "How to Get and Set the Default Printer in
Windows"
Knowledge Base Article Q140560 "How to Set the Default Printer Programmatically
in Windows 95"
48)----------------------------------------------------------------------------
Q> Как проверить, есть ли дискета в дисководе? A>
BOOL IsDiskInDrive ( LPTSTR lpszDrive )
{
UINT errmode;
TCHAR szVolName[256];
DWORD dwMaxComSize;
DWORD dwFlags;
TCHAR szFS[256];
BOOL bRes;
errmode = SetErrorMode ( SEM_FAILCRITICALERRORS );
//если не сделать SetErrorMode - выскочит стандартное окошко "Drive Not Ready"
bRes = GetVolumeInformation ( lpszDrive,
szVolName,
sizeof(szVolName),
NULL, &dwMaxComSize,
&dwFlags,
szFS, sizeof(szFS) );
SetErrorMode ( errmode );
return bRes;
}
Эта технология также работает с CDROM и другими сменными устройствами.
49)----------------------------------------------------------------------------
Q> Как послать пинг? A> Есть в кишках Windows icmp.dll. Юзать надо именно её.
//
// PingI.c -- Simple ping program using the proprietary
// Microsoft ICMP API
// Автор неизвестен
#include
#include
#include
#include
typedef struct tagIPINFO
{
u_char Ttl; // Time To Live
u_char Tos; // Type Of Service
u_char IPFlags; // IP flags
u_char OptSize; // Size of options data
u_char FAR *Options; // Options data buffer
}IPINFO, *PIPINFO;
typedef struct tagICMPECHO
{
u_long Source; // Source address
u_long Status; // IP status
u_long RTTime; // Round trip time in milliseconds
u_short DataSize; // Reply data size
u_short Reserved; // Unknown
void FAR *pData; // Reply data buffer
IPINFO ipInfo; // Reply options
}ICMPECHO, *PICMPECHO;
// ICMP.DLL Export Function Pointers
HANDLE (WINAPI *pIcmpCreateFile)(VOID);
BOOL (WINAPI *pIcmpCloseHandle)(HANDLE);
DWORD (WINAPI *pIcmpSendEcho)
(HANDLE,DWORD,LPVOID,WORD,PIPINFO,LPVOID,DWORD,DWORD);
//
//
void main(int argc, char **argv)
{
WSADATA wsaData; // WSADATA
ICMPECHO icmpEcho; // ICMP Echo reply buffer
HANDLE hndlIcmp; // LoadLibrary() handle to ICMP.DLL
HANDLE hndlFile; // Handle for IcmpCreateFile()
LPHOSTENT pHost; // Pointer to host entry structure
struct in_addr iaDest; // Internet address structure
DWORD *dwAddress; // IP Address
IPINFO ipInfo; // IP Options structure
int nRet; // General use return code
DWORD dwRet; // DWORD return code
int x;
// Check arguments
if (argc != 2)
{
fprintf(stderr,"\nSyntax: pingi HostNameOrIPAddress\n");
return;
}
// Dynamically load the ICMP.DLL
hndlIcmp = LoadLibrary("ICMP.DLL");
if (hndlIcmp == NULL)
{
fprintf(stderr,"\nCould not load ICMP.DLL\n");
return;
}
// Retrieve ICMP function pointers
pIcmpCreateFile = (HANDLE (WINAPI *)(void))
GetProcAddress(hndlIcmp,"IcmpCreateFile");
pIcmpCloseHandle = (BOOL (WINAPI *)(HANDLE))
GetProcAddress(hndlIcmp,"IcmpCloseHandle");
pIcmpSendEcho = (DWORD (WINAPI *)
(HANDLE,DWORD,LPVOID,WORD,PIPINFO,LPVOID,DWORD,DWORD))
GetProcAddress(hndlIcmp,"IcmpSendEcho");
// Check all the function pointers
if (pIcmpCreateFile == NULL ||
pIcmpCloseHandle == NULL ||
pIcmpSendEcho == NULL)
{
fprintf(stderr,"\nError getting ICMP proc address\n");
FreeLibrary(hndlIcmp);
return;
}
// Init WinSock
nRet = WSAStartup(0x0101, &wsaData );
if (nRet)
{
fprintf(stderr,"\nWSAStartup() error: %d\n", nRet);
WSACleanup();
FreeLibrary(hndlIcmp);
return;
}
// Check WinSock version
if (0x0101 != wsaData.wVersion)
{
fprintf(stderr,"\nWinSock version 1.1 not supported\n");
WSACleanup();
FreeLibrary(hndlIcmp);
return;
}
// Lookup destination
// Use inet_addr() to determine if we're dealing with a name
// or an address
iaDest.s_addr = inet_addr(argv[1]);
if (iaDest.s_addr == INADDR_NONE)
pHost = gethostbyname(argv[1]);
else
pHost = gethostbyaddr((const char *)&iaDest,
sizeof(struct in_addr), AF_INET);
if (pHost == NULL)
{
fprintf(stderr, "\n%s not found\n", argv[1]);
WSACleanup();
FreeLibrary(hndlIcmp);
return;
}
// Tell the user what we're doing
printf("\nPinging %s [%s]", pHost->h_name,
inet_ntoa((*(LPIN_ADDR)pHost->h_addr_list[0])));
// Copy the IP address
dwAddress = (DWORD *)(*pHost->h_addr_list);
// Get an ICMP echo request handle
hndlFile = pIcmpCreateFile();
for (x = 0; x < 4; x++)
{
// Set some reasonable default values
ipInfo.Ttl = 255;
ipInfo.Tos = 0;
ipInfo.IPFlags = 0;
ipInfo.OptSize = 0;
ipInfo.Options = NULL;
//icmpEcho.ipInfo.Ttl = 256;
// Reqest an ICMP echo
dwRet = pIcmpSendEcho(
hndlFile, // Handle from IcmpCreateFile()
*dwAddress, // Destination IP address
NULL, // Pointer to buffer to send
0, // Size of buffer in bytes
&ipInfo, // Request options
&icmpEcho, // Reply buffer
sizeof(struct tagICMPECHO),
5000); // Time to wait in milliseconds
// Print the results
iaDest.s_addr = icmpEcho.Source;
printf("\nReply from %s Time=%ldms TTL=%d",
inet_ntoa(iaDest),
icmpEcho.RTTime,
icmpEcho.ipInfo.Ttl);
if (icmpEcho.Status)
{
printf("\nError: icmpEcho.Status=%ld",
icmpEcho.Status);
break;
}
}
printf("\n");
// Close the echo request file handle
pIcmpCloseHandle(hndlFile);
FreeLibrary(hndlIcmp);
WSACleanup();
} |