Question

经过2天的研究，我终于将SDL库添加到我的＆＃34; CLion / Cmake / Windows＆＃34; -Project。

我做的是：

在CLion中创建了一个名为＆＃34; sdl_test_vc＆＃34;
我从https://www.libsdl.org/download-2.0.php下载了SDL2-devel-2.0.7-VC.zip并将其解压缩到我的项目文件夹中。
我在项目文件夹中添加了一个子目录＆＃34; cmake＆＃34;使用https://github.com/tcbrindle/sdl2-cmake-scripts

这是我的Cmake文件：

cmake_minimum_required(VERSION 3.8)
project(sdl_test_vc)

set(CMAKE_CXX_STANDARD 11)

set(SOURCE_FILES main.cpp)
add_executable(sdl_test_vc ${SOURCE_FILES})

# SDL2
set(SDL2_PATH "${sdl_test_vc_SOURCE_DIR}/SDL2-2.0.7")

# .cmake for finding SDL2: https://github.com/tcbrindle/sdl2-cmake-scripts
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${sdl_test_vc_SOURCE_DIR}/cmake")

find_package(SDL2 REQUIRED)
# find_package(SDL2_Image REQUIRED)
# find_package(SDL2_ttf REQUIRED)

include_directories(${SDL2_INCLUDE_DIR})
# ${SDL2_IMAGE_INCLUDE_DIR}
# ${SDL2_TTF_INCLUDE_DIR})

target_link_libraries(sdl_test_vc ${SDL2_LIBRARY})
# ${SDL2_IMAGE_LIBRARIES}

之后我创建了以下main.cpp

#include <iostream>
#include <SDL.h>

int main(int argc, char* argv[]) {
// Start SDL2
SDL_Init(SDL_INIT_EVERYTHING);

// Create a Window in the middle of the screen
SDL_Window *window = 0;

window = SDL_CreateWindow("Hello World!",
                          SDL_WINDOWPOS_CENTERED,
                          SDL_WINDOWPOS_CENTERED,
                          640, 480,
                          SDL_WINDOW_SHOWN);

// Delay so that we can see the window appear
SDL_Delay(2000);

// Cleanup and Quit
SDL_DestroyWindow(window);
SDL_Quit();

return 0;
}

构建项目时，出现以下错误。

../SDL2-2.0.7/lib/x64/SDL2main.lib(x64/Release/SDL_windows_main.obj):(.text[main]+0x0): multiple definition of `main'
C:/PROGRA~1/MINGW-~1/X86_64~1.0-P/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/7.2.0/../../../../x86_64-w64-mingw32/lib/../lib/libmingw32.a(lib64_libmingw32_a-crt0_c.o):crt0_c.c:(.text.startup+0x0): first defined here
collect2.exe: error: ld returned 1 exit status
mingw32-make.exe[3]: *** [CMakeFiles\sdl_test_vc.dir\build.make:99: sdl_test_vc.exe] Error 1
mingw32-make.exe[2]: *** [CMakeFiles\Makefile2:67: CMakeFiles/sdl_test_vc.dir/all] Error 2
mingw32-make.exe[1]: *** [CMakeFiles\Makefile2:79: CMakeFiles/sdl_test_vc.dir/rule] Error 2
mingw32-make.exe: *** [Makefile:117: sdl_test_vc] Error 2

任何人都可以帮我解决这个问题吗？

Answer 1

您正在使用SDLmain库，它定义了一个与平台相关的入口点，解析命令行参数（将它们转换为utf-8），然后调用SDL应用程序入口点。因此，在您的代码而不是main()中，您应该定义函数

int SDL_main(int argc, char *argv[])

请注意，如果定义了SDL_MAIN_NEEDED或SDL_MAIN_AVAILABLE，则SDL会自动将main重新定义为SDL_main，因此您无需更改main名称代码。

'main＆＃39;的多重定义什么时候包括SDL.h

1 个答案: