int wts_send_message(int mode, const char * title, const char * text,
int * perrcnt /* = 0 */)
{
if (perrcnt)
*perrcnt = 0;
// Get session list
WTS_SESSION_INFOA * sessions; DWORD count;
if (!WTSEnumerateSessionsA(WTS_CURRENT_SERVER_HANDLE, 0, 1, &sessions, &count))
return -1;
int msgcnt = 0;
for (unsigned i = 0; i < count; i++) {
if ( !strcmpi(sessions[i].pWinStationName, "Console")
|| (mode >= 1 && sessions[i].State == WTSActive)
|| (mode >= 2 && sessions[i].State == WTSConnected)) {
// Send Message, don't wait for OK button
DWORD result;
if (WTSSendMessageA(WTS_CURRENT_SERVER_HANDLE, sessions[i].SessionId,
const_cast<char *>(title), strlen(title),
const_cast<char *>(text), strlen(text),
MB_OK|MB_ICONEXCLAMATION, 0 /*Timeout*/,
&result, FALSE /*Wait*/))
msgcnt++;
else if (perrcnt)
(*perrcnt)++;
}
}
WTSFreeMemory(sessions);
return msgcnt;
}
int main(int argc, const char **argv)
{
int mode = 0, verbose = 0, status = 0, i;
const char * message = 0, * caption = "";
char msgbuf[1024];
WTS_SESSION_INFOA * sessions; DWORD count;
for (i = 1; i < argc && argv[i][0] == '-' && argv[i][1]; i++) {
int j;
for (j = 1; argv[i][j]; j++)
switch (argv[i][j]) {
case 'c': mode = 0; break;
case 'a': mode = 1; break;
case 's': mode = 2; break;
case 'v': verbose = 1; break;
default: return usage();
}
}
if (i < argc) {
if (i+1 < argc)
caption = argv[i++];
message = argv[i++];
if (i < argc)
return usage();
if (!strcmp(message, "-")) {
// Read message from stdin
i = fread(msgbuf, 1, sizeof(msgbuf)-1, stdin);
if (i < 0) {
perror("stdin");
return 1;
}
msgbuf[i] = 0;
message = msgbuf;
}
}
else {
if (!verbose)
return usage();
}
// Get session list
if (!WTSEnumerateSessionsA(WTS_CURRENT_SERVER_HANDLE, 0, 1, &sessions, &count)) {
fprintf(stderr, "WTSEnumerateSessions() failed\n");
return 1;
}
for (i = 0; i < (int)count; i++) {
if (verbose) {
printf("Session %d (\"%s\", State=%d)%s",
i, sessions[i].pWinStationName, sessions[i].State,
(!message ? "\n" : ": "));
if (!message)
continue; // List sessions only
fflush(stdout);
}
if ( !strcmpi(sessions[i].pWinStationName, "Console")
|| (mode >= 1 && sessions[i].State == WTSActive)
|| (mode >= 2 && sessions[i].State == WTSConnected)) {
// Send Message, don't wait for OK button
DWORD result;
if (WTSSendMessageA(WTS_CURRENT_SERVER_HANDLE, sessions[i].SessionId,
(char *)caption, strlen(caption),
(char *)message, strlen(message),
MB_OK|MB_ICONEXCLAMATION, 0 /*Timeout*/,
&result, FALSE /*!Wait*/)) {
if (verbose)
printf("message sent\n");
}
else {
status = 1;
if (verbose)
printf("WTSSendMessage() failed with error=%d\n", (int)GetLastError());
else
fprintf(stderr, "Session %d (\"%s\", State=%d): WTSSendMessage() failed with error=%d\n",
i, sessions[i].pWinStationName, sessions[i].State, (int)GetLastError());
}
}
else {
if (verbose)
printf("ignored\n");
}
}
WTSFreeMemory(sessions);
return status;
}
