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