Go调用SDL2的C语言动态库
在网上找到go的GUI项目基本都需要安装额外软件库，尝试了一下使用go调用dll库的，有所收获，抛砖引玉，留个记录怕以后忘了。
1.目录结构
└─libtest│main.go│sdl.go└─libSDL2.dll
2. 库函数封装(sdl.go)
packagemainimport("syscall""unsafe")//SDL_INIT_Flag 初始化标志const(SDL_INIT_TIMER =0x00000001SDL_INIT_AUDIO =0x00000010SDL_INIT_VIDEO =0x00000020/**< SDL_INIT_VIDEO implies SDL_INIT_EVENTS */SDL_INIT_JOYSTICK =0x00000200/**< SDL_INIT_JOYSTICK implies SDL_INIT_EVENTS */SDL_INIT_HAPTIC =0x00001000SDL_INIT_GAMECONTROLLER =0x00002000/**< SDL_INIT_GAMECONTROLLER implies SDL_INIT_JOYSTICK */SDL_INIT_EVENTS =0x00004000SDL_INIT_NOPARACHUTE =0x00100000/**< compatibility; this flag is ignored. */SDL_INIT_EVERYTHING = SDL_INIT_TIMER | SDL_INIT_AUDIO | SDL_INIT_VIDEO | SDL_INIT_EVENTS |SDL_INIT_JOYSTICK | SDL_INIT_HAPTIC | SDL_INIT_GAMECONTROLLER)// SDL_WindowFlags 窗体标志const(/* !!!FIXME:change this to name = (1<
On macOS NSHighResolutionCapable must be set true in the
application's Info.plist for this to have any effect. */SDL_WINDOW_MOUSE_CAPTURE =0x00004000/**< window has mouse captured (unrelated to INPUT_GRABBED) */SDL_WINDOW_ALWAYS_ON_TOP =0x00008000/**< window should always be above others */SDL_WINDOW_SKIP_TASKBAR =0x00010000/**< window should not be added to the taskbar */SDL_WINDOW_UTILITY =0x00020000/**< window should be treated as a utility window */SDL_WINDOW_TOOLTIP =0x00040000/**< window should be treated as a tooltip */SDL_WINDOW_POPUP_MENU =0x00080000/**< window should be treated as a popup menu */SDL_WINDOW_VULKAN =0x10000000/**< window usable for Vulkan surface */)// SDL_Window SDL窗体typeSDL_Windowstruct{}// SDL_Event SDL 事件typeSDL_Eventstruct{}// SDL_Init SDL 初始化funcSDL_Init(flagsuint32)bool{ret := SysCallDll("SDL_Init",1,uintptr(flags))ifint(ret) ==0{returntrue}returnfalse}// SDL_CreateWindow 创建window窗体,失败返回nilfuncSDL_CreateWindow(titlestring, posX, posY, width, height, sdlWindowFlagint32)*SDL_Window{vartp, _ = syscall.BytePtrFromString(title)// 将string转为*bytevartptr = unsafe.Pointer(tp)// 获取*byte指针ret := SysCallDll("SDL_CreateWindow",6,uintptr(tptr),uintptr(posX),uintptr(posY),uintptr(width),uintptr(height),uintptr(sdlWindowFlag))ifint(ret) ==0{returnnil}return(*SDL_Window)(unsafe.Pointer(ret))}// SDL_Delay 延迟xxx ms后返回funcSDL_Delay(msuint32){SysCallDll("SDL_Delay",1,uintptr(ms))}// SDL_DestroyWindow 销毁窗体funcSDL_DestroyWindow(window *SDL_Window){SysCallDll("SDL_DestroyWindow",1,uintptr(unsafe.Pointer(window)))}//SDL_Quit(void) 退出SDL系统funcSDL_Quit(){SysCallDll("SDL_Quit",0)}// SDL_PollEvent 轮询当前挂起的事件funcSDL_PollEvent(event *SDL_Event)bool{ret := SysCallDll("SDL_PollEvent",1,uintptr(unsafe.Pointer(event)))ifint(ret) ==1{returntrue}returnfalse}
3. 加载动态库(main.go)
packagemainimport("fmt""syscall""unsafe")// ThrowErr 抛出异常funcThrowErr(strstring, err error){iferr !=nil{fmt.Printf("[Err]:%s,%v\n", str, err)}}// 动态库的指针varhsdl syscall.Handle// LoadDLL 加载动态库funcLoadDll(){varerr errorhsdl, err = syscall.LoadLibrary("lib/SDL2.dll")ThrowErr("LoadLibrary-SDL", err)}// FreeDll 释放动态库funcFreeDll(){ifhsdl !=0{syscall.FreeLibrary(hsdl)}}// SysCallDll 包装syscall.Syscall/6/9/12 调用动态库内函数// funcName 函数名; argsNum 参数个数; args 可变参数funcSysCallDll(funcNamestring, argsNumint32, args ...uintptr)(ruintptr){proc, err := syscall.GetProcAddress(hsdl, funcName)ThrowErr(funcName, err)varerrs errorvardebugbool=falsevarfargs = [12]uintptr{}//获取参数fori, arg :=rangeargs {fargs[i] = arg}if(argsNum >-1) && (argsNum <4) {//小于等于3个参数r, _, errs = syscall.Syscall(uintptr(proc),uintptr(argsNum),fargs[0], fargs[1], fargs[2])//ThrowErr(funcName, errs)}elseif(argsNum >3) && (argsNum <7) {//小于等于6个参数r, _, errs = syscall.Syscall6(uintptr(proc),uintptr(argsNum),fargs[0], fargs[1], fargs[2], fargs[3], fargs[4], fargs[5])//ThrowErr(funcName, errs)}elseif(argsNum >6) && (argsNum <10) {//小于等于9个参数r, _, errs = syscall.Syscall9(uintptr(proc),uintptr(argsNum), fargs[0], fargs[1],fargs[2], fargs[3], fargs[4], fargs[5], fargs[6], fargs[7], fargs[8])//ThrowErr(funcName, errs)}elseif(argsNum >9) && (argsNum <13) {//小于等于12个参数r, _, errs = syscall.Syscall12(uintptr(proc),uintptr(argsNum), fargs[0], fargs[1],fargs[2], fargs[3], fargs[4], fargs[5], fargs[6], fargs[7], fargs[8],fargs[9], fargs[10], fargs[11])//ThrowErr(funcName, errs)}else{fmt.Println("The args number was bigger than 12.")}ifdebug {fmt.Println(errs)}returnr}// CharPtr2String 从char指针读取stringfuncCharPtr2String(vcodeuintptr)string{varvbyte []bytefori :=0; i <20; i++ {sbyte := *((*byte)(unsafe.Pointer(vcode)))ifsbyte ==0{break}vbyte =append(vbyte, sbyte)vcode +=1}returnstring(vbyte)}// testSdlWindow 创建窗体，然后暂停程序所以窗体没响应functestSdlWindow(){LoadDll()// 加载动态库ifSDL_Init(SDL_INIT_VIDEO) {// 初始化视频子系统// 创建窗体win := SDL_CreateWindow("SDL窗体标题",50,50,600,480, SDL_WINDOW_SHOWN)ifwin ==nil{fmt.Println("SDL_CreateWindow 失败")}SDL_Delay(6000)// 暂停程序6000msSDL_DestroyWindow(win)// 销毁释放窗体}SDL_Quit()// 退出清理SDLdeferFreeDll()// 释放动态库SDL2.dll}// testSdlWindow2 创建窗体，使用事件循环显示可响应窗体functestSdlWindow2(){LoadDll()// 加载动态库ifSDL_Init(SDL_INIT_VIDEO) {// 初始化视频子系统// 创建窗体win := SDL_CreateWindow("SDL窗体标题",50,50,600,480, SDL_WINDOW_SHOWN)ifwin ==nil{fmt.Println("SDL_CreateWindow 失败")}for{// 事件循环ifSDL_PollEvent(evt) {// 轮询事件队列// 此处SDL_Event在C语言中为联合，需要其他处理// if GetEventType(evt) == SDL_QUIT { // 退出事件// break// }}}SDL_DestroyWindow(win)// 销毁释放窗体SDL_Quit()// 退出清理SDLdeferFreeDll()// 释放动态库SDL2.dll}}varevt =new(SDL_Event)// SDL事件funcmain(){testSdlWindow2()}
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