fResult = GetMailslotInfo( hSlot, // mailslot handle (LPDWORD) NULL, // no maximum message size &cbMessage, // size of next message &cMessage, // number of messages (LPDWORD) NULL); // no read time-out
if (!fResult) { printf("GetMailslotInfo failed with %d.\n", GetLastError()); return FALSE; }
if (cbMessage == MAILSLOT_NO_MESSAGE) { printf("Waiting for a message...\n"); return TRUE; }
cAllMessages = cMessage;
while (cMessage != 0) // retrieve all messages { // Create a message-number string.
StringCchPrintf((LPTSTR) achID, 80, TEXT("\nMessage #%d of %d\n"), cAllMessages - cMessage + 1, cAllMessages); // Allocate memory for the message.
_tprintf(TEXT("Contents of the mailslot: %s\n"), lpszBuffer);
GlobalFree((HGLOBAL) lpszBuffer);
fResult = GetMailslotInfo(hSlot, // mailslot handle (LPDWORD) NULL, // no maximum message size &cbMessage, // size of next message &cMessage, // number of messages (LPDWORD) NULL); // no read time-out
if (!fResult) { printf("GetMailslotInfo failed (%d)\n", GetLastError()); return FALSE; } } CloseHandle(hEvent); return TRUE; }BOOL WINAPI MakeSlot(LPTSTR lpszSlotName) { hSlot = CreateMailslot(lpszSlotName, 0, // no maximum message size MAILSLOT_WAIT_FOREVER, // no time-out for operations (LPSECURITY_ATTRIBUTES) NULL); // default security
#include <tchar.h>
#include <stdio.h>
#include <strsafe.h>HANDLE hSlot;
LPTSTR SlotName = TEXT("\\\\.\\mailslot\\sample_mailslot");BOOL ReadSlot()
{
DWORD cbMessage, cMessage, cbRead;
BOOL fResult;
LPTSTR lpszBuffer;
TCHAR achID[80];
DWORD cAllMessages;
HANDLE hEvent;
OVERLAPPED ov;
cbMessage = cMessage = cbRead = 0; hEvent = CreateEvent(NULL, FALSE, FALSE, TEXT("ExampleSlot"));
if( NULL == hEvent )
return FALSE;
ov.Offset = 0;
ov.OffsetHigh = 0;
ov.hEvent = hEvent;
fResult = GetMailslotInfo( hSlot, // mailslot handle
(LPDWORD) NULL, // no maximum message size
&cbMessage, // size of next message
&cMessage, // number of messages
(LPDWORD) NULL); // no read time-out
if (!fResult)
{
printf("GetMailslotInfo failed with %d.\n", GetLastError());
return FALSE;
}
if (cbMessage == MAILSLOT_NO_MESSAGE)
{
printf("Waiting for a message...\n");
return TRUE;
}
cAllMessages = cMessage;
while (cMessage != 0) // retrieve all messages
{
// Create a message-number string.
StringCchPrintf((LPTSTR) achID,
80,
TEXT("\nMessage #%d of %d\n"),
cAllMessages - cMessage + 1,
cAllMessages); // Allocate memory for the message.
lpszBuffer = (LPTSTR) GlobalAlloc(GPTR,
lstrlen((LPTSTR) achID)*sizeof(TCHAR) + cbMessage);
if( NULL == lpszBuffer )
return FALSE;
lpszBuffer[0] = '\0';
fResult = ReadFile(hSlot,
lpszBuffer,
cbMessage,
&cbRead,
&ov);
if (!fResult)
{
printf("ReadFile failed with %d.\n", GetLastError());
GlobalFree((HGLOBAL) lpszBuffer);
return FALSE;
}
// Concatenate the message and the message-number string.
StringCbCat(lpszBuffer,
lstrlen((LPTSTR) achID)*sizeof(TCHAR)+cbMessage,
(LPTSTR) achID);
// Display the message.
_tprintf(TEXT("Contents of the mailslot: %s\n"), lpszBuffer);
GlobalFree((HGLOBAL) lpszBuffer);
fResult = GetMailslotInfo(hSlot, // mailslot handle
(LPDWORD) NULL, // no maximum message size
&cbMessage, // size of next message
&cMessage, // number of messages
(LPDWORD) NULL); // no read time-out
if (!fResult)
{
printf("GetMailslotInfo failed (%d)\n", GetLastError());
return FALSE;
}
}
CloseHandle(hEvent);
return TRUE;
}BOOL WINAPI MakeSlot(LPTSTR lpszSlotName)
{
hSlot = CreateMailslot(lpszSlotName,
0, // no maximum message size
MAILSLOT_WAIT_FOREVER, // no time-out for operations
(LPSECURITY_ATTRIBUTES) NULL); // default security
if (hSlot == INVALID_HANDLE_VALUE)
{
printf("CreateMailslot failed with %d\n", GetLastError());
return FALSE;
}
return TRUE;
}void main()
{
MakeSlot(SlotName); while(TRUE)
{
ReadSlot();
Sleep(3000);
}
}