reactos/rosapps/tests/nptest/npclient.c

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#include <windows.h>
VOID MyErrExit(LPTSTR Message)
{
// MessageBox(NULL, Message, NULL, MB_OK);
puts(Message);
ExitProcess(0);
}
int main(int argc, char *argv[])
{
HANDLE hPipe;
LPVOID lpvMessage;
CHAR chBuf[512];
BOOL fSuccess;
DWORD cbRead, cbWritten, dwMode;
LPTSTR lpszPipename = "\\\\.\\pipe\\mynamedpipe";
// Try to open a named pipe; wait for it, if necessary.
while (1)
{
hPipe = CreateFile(
lpszPipename, // pipe name
GENERIC_READ | // read and write access
GENERIC_WRITE,
0, // no sharing
NULL, // no security attributes
OPEN_EXISTING, // opens existing pipe
0, // default attributes
NULL); // no template file
// Break if the pipe handle is valid.
if (hPipe != INVALID_HANDLE_VALUE)
break;
// Exit if an error other than ERROR_PIPE_BUSY occurs.
if (GetLastError() != ERROR_PIPE_BUSY)
MyErrExit("Could not open pipe");
// All pipe instances are busy, so wait for 20 seconds.
if (! WaitNamedPipe(lpszPipename, 20000) )
MyErrExit("Could not open pipe");
}
// The pipe connected; change to message-read mode.
dwMode = PIPE_READMODE_MESSAGE;
fSuccess = SetNamedPipeHandleState(
hPipe, // pipe handle
&dwMode, // new pipe mode
NULL, // don't set maximum bytes
NULL); // don't set maximum time
if (!fSuccess)
MyErrExit("SetNamedPipeHandleState");
// Send a message to the pipe server.
lpvMessage = (argc > 1) ? argv[1] : "default message";
fSuccess = WriteFile(
hPipe, // pipe handle
lpvMessage, // message
strlen(lpvMessage) + 1, // message length
&cbWritten, // bytes written
NULL); // not overlapped
if (! fSuccess)
MyErrExit("WriteFile");
do
{
// Read from the pipe.
fSuccess = ReadFile(
hPipe, // pipe handle
chBuf, // buffer to receive reply
512, // size of buffer
&cbRead, // number of bytes read
NULL); // not overlapped
if (! fSuccess && GetLastError() != ERROR_MORE_DATA)
break;
// Reply from the pipe is written to STDOUT.
if (! WriteFile(GetStdHandle(STD_OUTPUT_HANDLE),
chBuf, cbRead, &cbWritten, NULL))
{
break;
}
} while (! fSuccess); // repeat loop if ERROR_MORE_DATA
CloseHandle(hPipe);
return 0;
}