CLI utility for Windows that can start a process hiding it's window. #c #windows #cli

hstart.c

//
// The MIT License (MIT)
//
// Copyright (c) 2013 Max Truxa
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

#include <Windows.h>
#include <stdio.h>
#include <string.h>
#include <tchar.h>

int printUsage() {
    TCHAR executable[MAX_PATH];
    DWORD length;
    DWORD errCode;
    
    length = GetModuleFileName(NULL, executable, _countof(executable));
    if (length == 0 || (length == _countof(executable) && GetLastError() != ERROR_SUCCESS)) {
        _tcscpy_s(executable, _countof(executable), "hstart");
    }
    
    // In Visual Studio 13 and earlier "%s" is mapped to the natural width of the format string.
    // Microsoft fixed this in Visual Studio 2014 CTP1 (_MSC_VER == 1900) and introduced "%Ts".
#if defined _MSC_VER && MSC_VER >= 1900
#   define STRING_FORMAT_SPECIFIER _T("%Ts")
#else
#   define STRING_FORMAT_SPECIFIER _T("%s")
#endif
    _tprintf(
        _T("Usage:\n")
        _T("  ") STRING_FORMAT_SPECIFIER _T(" <CommandToRun>\n"),
        executable
        );
    
    return 0;
}

int runSilent(TCHAR* cmdLine) {
    STARTUPINFO si = { 0 };
    PROCESS_INFORMATION pi = { 0 };
    DWORD errCode;
    
    si.cb = sizeof(si);
    si.dwFlags = STARTF_USESHOWWINDOW;
    si.wShowWindow = SW_HIDE;
    
    if (CreateProcess(NULL, cmdLine, NULL, NULL, FALSE, CREATE_NEW_CONSOLE, NULL, NULL, &si, &pi) == FALSE) {
        errCode = GetLastError();
        _tprintf(_T("ERROR %u\n"), errCode);
        return (int)errCode;
    }
    
    CloseHandle(pi.hThread);
    CloseHandle(pi.hProcess);
    
    return 0;
}

int CALLBACK _tWinMain(HINSTANCE, HINSTANCE, TCHAR* cmdLine, int) {
    if (*cmdLine == '\0') {
        return printUsage();
    }
    return runSilent(cmdLine);
}

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