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#pragma once
#ifdef _MSC_VER
#include <Windows.h>
#include <vector>
#include <string>
#include <iostream>
#pragma warning (push)
#pragma warning (disable : 4996) // For getenv.
namespace pipe {
using std::string;
using std::istream;
using std::ostream;
using std::cout;
using std::endl;
/**
* Run a piped process on Windows.
*/
static const size_t bufferSize = 1024;
struct WriteData {
istream &stream;
HANDLE handle;
};
DWORD WINAPI writeThread(void *data) {
WriteData *d = (WriteData *)data;
char buffer[bufferSize];
DWORD filled;
DWORD written;
d->stream.read(buffer, bufferSize);
filled = (DWORD)d->stream.gcount();
while (filled > 0) {
if (!WriteFile(d->handle, buffer, filled, &written, NULL)) {
cout << "Error: " << GetLastError() << endl;
CloseHandle(d->handle);
return 0;
}
if (written < filled) {
memmove(buffer, buffer + written, filled - written);
filled -= written;
} else {
d->stream.read(buffer, bufferSize);
filled = (DWORD)d->stream.gcount();
}
}
CloseHandle(d->handle);
return 0;
}
struct ReadData {
ostream &stream;
HANDLE handle;
};
DWORD WINAPI readThread(void *data) {
ReadData *d = (ReadData *)data;
char buffer[bufferSize];
DWORD written;
while (ReadFile(d->handle, buffer, bufferSize, &written, NULL)) {
d->stream.write(buffer, written);
if (written == 0)
break;
}
CloseHandle(d->handle);
return 0;
}
void runProcess(const string &exe, const string &cmd, istream &inStream, ostream &outStream) {
STARTUPINFO startup;
memset(&startup, 0, sizeof(startup));
startup.cb = sizeof(startup);
startup.dwFlags = STARTF_USESTDHANDLES;
SECURITY_ATTRIBUTES writeSa;
writeSa.nLength = sizeof(SECURITY_ATTRIBUTES);
writeSa.bInheritHandle = TRUE;
writeSa.lpSecurityDescriptor = NULL;
HANDLE input, output;
CreatePipe(&startup.hStdInput, &input, &writeSa, 0);
CreatePipe(&output, &startup.hStdOutput, &writeSa, 0);
startup.hStdError = startup.hStdOutput;
SetHandleInformation(input, HANDLE_FLAG_INHERIT, 0);
SetHandleInformation(output, HANDLE_FLAG_INHERIT, 0);
PROCESS_INFORMATION info;
char *cmdline = new char[cmd.size() + 1];
memcpy(cmdline, cmd.c_str(), cmd.size() + 1);
if (CreateProcess(exe.c_str(), cmdline, NULL, NULL, TRUE, 0, NULL, NULL, &startup, &info) == 0) {
cout << "Failed to start " << exe << endl;
exit(1);
}
delete []cmdline;
CloseHandle(startup.hStdInput);
CloseHandle(startup.hStdOutput);
CloseHandle(info.hThread);
WriteData wd = { inStream, input };
ReadData rd = { outStream, output };
HANDLE wThread = CreateThread(NULL, 0, &writeThread, &wd, 0, NULL);
HANDLE rThread = CreateThread(NULL, 0, &readThread, &rd, 0, NULL);
WaitForSingleObject(info.hProcess, INFINITE);
WaitForSingleObject(wThread, INFINITE);
WaitForSingleObject(rThread, INFINITE);
CloseHandle(info.hProcess);
}
// Run using cmd.exe. If "remain" is true, then /K is used instead of /C
void runCmd(bool remain, const string &cmd, istream &inStream, ostream &outStream) {
string exe = getenv("comspec");
string c = (remain ? "/K " : "/C ") + cmd;
runProcess(exe, c, inStream, outStream);
}
}
#pragma warning (pop)
#endif
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