ぬの部屋(仮)
nu-no-he-ya
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  • C++からwin32apiでWinMainを使うmeson.buildを書いてみる

    WinMainを使う場合、/SUBSYSTEM:WINDOWSを指定する。

    問題は、mesonが勝手に/SUBSYSTEM:CONSOLEをつけてしまうので、エントリポイントがmainなのかWinMainなのかわからなくなりエラーが出る。

    [1/1] Linking target myapp.exe
    FAILED: myapp.exe myapp.pdb
    "link" /MACHINE:x64 /OUT:myapp.exe myapp.exe.p/main.cpp.obj "/nologo" "/release" "/nologo" "/DEBUG" "/PDB:myapp.pdb" "/SUBSYSTEM:WINDOWS" "/SUBSYSTEM:CONSOLE" "kernel32.lib" "user32.lib" "gdi32.lib" "winspool.lib" "shell32.lib" "ole32.lib" "oleaut32.lib" "uuid.lib" "comdlg32.lib" "advapi32.lib"
    MSVCRTD.lib(exe_main.obj) : error LNK2019: 未解決の外部シンボル main が関数 "int __cdecl invoke_main(void)" (?invoke_main@@YAHXZ) で参照されました
    myapp.exe : fatal error LNK1120: 1 件の未解決の外部参照
    ninja: build stopped: subcommand failed.

    これを回避するために、 gui_app: true を指定する。

    project('myapp', 'cpp') cpp = meson.get_compiler('cpp') executable('myapp', 'main.cpp', gui_app: true, # WinMainを使うときはこれが必要 cpp_args: [ '/D_WINDOWS' ], link_args: [ '/SUBSYSTEM:WINDOWS' # WinMainを使うときはこれが必要 ] )

    ビルド

    meson setup build

    meson compile -C build

    の順で実行する。

    	

    (mesonenv) C:\Users\myuser\source\repos\win32>meson setup build Directory already configured. Just run your build command (e.g. ninja) and Meson will regenerate as necessary. If ninja fails, run "ninja reconfigure" or "meson setup --reconfigure" to force Meson to regenerate. If build failures persist, run "meson setup --wipe" to rebuild from scratch using the same options as passed when configuring the build. To change option values, run "meson configure" instead. (mesonenv) C:\Users\myuser\source\repos\win32>meson compile -C build Activating VS 17.5.4 INFO: automatically activated MSVC compiler environment INFO: autodetecting backend as ninja INFO: calculating backend command to run: C:\Users\myuser\anaconda3\envs\mesonenv\Library\bin\ninja.EXE -C C:/Users/szl/source/repos/win32/build ninja: Entering directory `C:/Users/myuser/source/repos/win32/build' [0/1] Regenerating build files. The Meson build system Version: 1.0.1 Source dir: C:\Users\myuser\source\repos\win32 Build dir: C:\Users\myuser\source\repos\win32\build Build type: native build Project name: myapp Project version: undefined C++ compiler for the host machine: cl (msvc 19.35.32217.1 "Microsoft(R) C/C++ Optimizing Compiler Version 19.35.32217.1 for x64") C++ linker for the host machine: link link 14.35.32217.1 Host machine cpu family: x86_64 Host machine cpu: x86_64 Build targets in project: 1 Found ninja-1.10.2 at C:\Users\myuser\anaconda3\envs\mesonenv\Library\bin\ninja.EXE Cleaning... 0 files. [1/1] Linking target myapp.exe

    サンプルコード main.cpp

    #include<windows.h>
    
    LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wp, LPARAM lp) {
      HDC hdc;
      switch (msg) {
      case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
      }
      return DefWindowProc(hwnd, msg, wp, lp);
    }
    
    int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
      PSTR lpCmdLine, int nCmdShow) {
      HWND hwnd;
      WNDCLASS winc;
      MSG msg;
    
      winc.style = CS_HREDRAW | CS_VREDRAW;
      winc.lpfnWndProc = WndProc;
      winc.cbClsExtra = winc.cbWndExtra = 0;
      winc.hInstance = hInstance;
      winc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
      winc.hCursor = LoadCursor(NULL, IDC_ARROW);
      winc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
      winc.lpszMenuName = NULL;
      winc.lpszClassName = TEXT("SZL-WIN");
    
      if (!RegisterClass(&winc)) return 0;
    
      hwnd = CreateWindow(
        TEXT("SZL-WIN"), TEXT("test"),
        WS_OVERLAPPEDWINDOW | WS_VISIBLE,
        CW_USEDEFAULT, CW_USEDEFAULT,
        CW_USEDEFAULT, CW_USEDEFAULT,
        NULL, NULL,
        hInstance, NULL
      );
    
      if (hwnd == NULL) return 0;
    
      while (GetMessage(&msg, NULL, 0, 0)) DispatchMessage(&msg);
      return msg.wParam;
    }