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#include <windows.h>
#include <iostream>
// Opens a file and holds it open until the caller sends input.
// Then it closes the file and exits.
void usage(int argc, wchar_t** argv) {
std::wcout << L"Usage:\n"
<< L" " << argv[0] << L" filename [sharing]\n\n"
<< L" filename\n"
<< L" The path of the file to hold open.\n"
<< L" sharing\n"
<< L" File sharing flags. 'r', 'w', and/or 'd' can be\n"
<< L" specified. Defaults to no sharing.\n\n";
}
int wmain(int argc, wchar_t** argv) {
DWORD dwShareMode = 0;
if (argc < 2 || argc > 3) {
usage(argc, argv);
exit(1);
}
if (argc >= 3) {
for (wchar_t* curr = argv[2]; *curr; ++curr) {
switch (*curr) {
case L'w':
dwShareMode |= FILE_SHARE_WRITE;
break;
case L'r':
dwShareMode |= FILE_SHARE_READ;
break;
case L'd':
dwShareMode |= FILE_SHARE_DELETE;
break;
default:
usage(argc, argv);
return 1;
}
}
}
HANDLE handle = CreateFileW(argv[1], GENERIC_READ, dwShareMode, nullptr,
OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, nullptr);
if (handle == INVALID_HANDLE_VALUE) {
std::wcout << L"failed to open file " << argv[1] << std::endl;
return 1;
}
std::wcout << "Locked" << std::endl;
(void)std::wcin.get();
CloseHandle(handle);
return 0;
}