languages

A collection of programs made with different programming languages.
git clone git://evanalba.com/languages
Log | Files | Refs

utils.cpp (1788B)

      1 #include "utils.h"
      2 
      3 #include <flutter_windows.h>
      4 #include <io.h>
      5 #include <stdio.h>
      6 #include <windows.h>
      7 
      8 #include <iostream>
      9 
     10 void CreateAndAttachConsole() {
     11   if (::AllocConsole()) {
     12     FILE *unused;
     13     if (freopen_s(&unused, "CONOUT$", "w", stdout)) {
     14       _dup2(_fileno(stdout), 1);
     15     }
     16     if (freopen_s(&unused, "CONOUT$", "w", stderr)) {
     17       _dup2(_fileno(stdout), 2);
     18     }
     19     std::ios::sync_with_stdio();
     20     FlutterDesktopResyncOutputStreams();
     21   }
     22 }
     23 
     24 std::vector<std::string> GetCommandLineArguments() {
     25   // Convert the UTF-16 command line arguments to UTF-8 for the Engine to use.
     26   int argc;
     27   wchar_t** argv = ::CommandLineToArgvW(::GetCommandLineW(), &argc);
     28   if (argv == nullptr) {
     29     return std::vector<std::string>();
     30   }
     31 
     32   std::vector<std::string> command_line_arguments;
     33 
     34   // Skip the first argument as it's the binary name.
     35   for (int i = 1; i < argc; i++) {
     36     command_line_arguments.push_back(Utf8FromUtf16(argv[i]));
     37   }
     38 
     39   ::LocalFree(argv);
     40 
     41   return command_line_arguments;
     42 }
     43 
     44 std::string Utf8FromUtf16(const wchar_t* utf16_string) {
     45   if (utf16_string == nullptr) {
     46     return std::string();
     47   }
     48   int target_length = ::WideCharToMultiByte(
     49       CP_UTF8, WC_ERR_INVALID_CHARS, utf16_string,
     50       -1, nullptr, 0, nullptr, nullptr)
     51     -1; // remove the trailing null character
     52   int input_length = (int)wcslen(utf16_string);
     53   std::string utf8_string;
     54   if (target_length <= 0 || target_length > utf8_string.max_size()) {
     55     return utf8_string;
     56   }
     57   utf8_string.resize(target_length);
     58   int converted_length = ::WideCharToMultiByte(
     59       CP_UTF8, WC_ERR_INVALID_CHARS, utf16_string,
     60       input_length, utf8_string.data(), target_length, nullptr, nullptr);
     61   if (converted_length == 0) {
     62     return std::string();
     63   }
     64   return utf8_string;
     65 }