调用Glib::spawn_async_with_pipes报无匹配函数编译错误求助

问题描述 #

我在C++代码里调用Glib::spawn_async_with_pipes函数时遇到编译错误，虽然通过nm -D /lib/x86_64-linux-gnu/libglibmm-2.4.so | grep "spawn_async_with_pipes"命令确认该函数存在于库中，但编译依然失败。

编译报错信息 #

main.cpp:44:37: error: no matching function for call to ‘spawn_async_with_pipes(const char [2], <brace-enclosed initializer list>, Glib::SpawnFlags, sigc::slot<void, int, int>, GPid*, Glib::RefPtr<Glib::IOChannel>*, Glib::RefPtr<Glib::IOChannel>*, std::nullptr_t, std::nullptr_t)’
   44 |         Glib::spawn_async_with_pipes(".",   // Working directory
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
   45 |                                      {"bash", "-c", command}, // Command to execute
      |                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   46 |                                      Glib::SPAWN_DEFAULT,    // Spawn flags
      |                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   47 |                                      sigc::slot<void, Glib::Pid, int>(
      |                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   48 |                                          sigc::mem_fun(*this, &TerminalWindow::on_subprocess_exit)), // Callback
      |                                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   49 |                                      &pid,    // Process ID
      |                                      ~~~~~~~~~~~~~~~~~~~~~~
   50 |                                      &stdin_channel, // Standard input channel
      |                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   51 |                                      &stdout_channel,  // Standard output channel
      |                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   52 |                                      nullptr, // Standard error channel
      |                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   53 |                                      nullptr  // Main context
      |                                      ~~~~~~~~~~~~~~~~~~~~~~~~
   54 |         );

使用的编译命令 #

g++ main.cpp pkg-config --cflags --libs gtkmm-3.0 glib-2.0 gio-2.0

引发问题的代码片段 #

void handle_command() {
    Gtk::TextIter start, end;
    terminal_buffer->get_bounds(start, end);
    std::string command = terminal_buffer->get_text(start, end);

    // ... Create pipes for input and output
    Glib::RefPtr<Glib::IOChannel> stdin_channel, stdout_channel;
    int exit_status = 0;

    // Spawn the subprocess with pipes for input and output
    Glib::spawn_async_with_pipes(".",   // Working directory
                                 {"bash", "-c", command}, // Command to execute
                                 Glib::SPAWN_DEFAULT,    // Spawn flags
                                 sigc::slot<void, Glib::Pid, int>(
                                     sigc::mem_fun(*this, &TerminalWindow::on_subprocess_exit)), // Callback
                                 &pid,    // Process ID
                                 &stdin_channel, // Standard input channel
                                 &stdout_channel,  // Standard output channel
                                 nullptr, // Standard error channel
                                 nullptr  // Main context
    );
}

解决方法 #

1. 修正命令行参数类型 #

spawn_async_with_pipes的第二个参数要求是std::vector<std::string>类型，直接使用初始化列表会因为包含std::string对象导致类型不匹配。改成显式声明vector：

std::vector<std::string> argv = {"bash", "-c", command};
Glib::spawn_async_with_pipes(".",
                             argv,
                             Glib::SPAWN_DEFAULT,
                             sigc::slot<void, Glib::Pid, int>(
                                 sigc::mem_fun(*this, &TerminalWindow::on_subprocess_exit)),
                             &pid,
                             &stdin_channel,
                             &stdout_channel,
                             nullptr,
                             nullptr
);

2. 确保回调函数签名一致 #

报错显示推导的回调签名是sigc::slot<void, int, int>，和你声明的sigc::slot<void, Glib::Pid, int>不符。检查on_subprocess_exit函数，必须严格匹配以下签名：

void on_subprocess_exit(Glib::Pid pid, int exit_status) {
    // 你的处理逻辑
}

3. 修复编译命令格式 #

编译命令里pkg-config部分必须用反引号包裹，否则g会把它当成源文件处理；同时要链接glibmm-2.0（C封装库）而非glib-2.0（C库）：

g++ main.cpp `pkg-config --cflags --libs gtkmm-3.0 glibmm-2.0 gio-2.0`

4. 确认变量pid的类型 #

确保pid的类型是Glib::Pid（对应C库的GPid），避免因类型不匹配导致参数错误。

内容的提问来源于stack exchange，提问作者RAT