SDL 2.0：如何從SDL_SysWMinfo

我試圖用win32和SDL 2.0做一個透明的窗口，因爲它的官方API還沒有被釋放。我一直無法引用窗口字段到達HWND。它給了我這個錯誤當前

F:\C programs and compiliers\C\SDL_test\main.c||In function 'get_system_data':| 
F:\C programs and compiliers\C\SDL_test\main.c|220|error: 'union <anonymous>' has no member named 'window'| 
||=== Build finished: 1 errors, 0 warnings (0 minutes, 0 seconds) ===|

據我所知，它聲明的結構與連接相關的工會這樣的：

struct SDL_SysWMinfo 
{ 
    SDL_version version; 
    SDL_SYSWM_TYPE subsystem; 
    union 
    { 
#if defined(SDL_VIDEO_DRIVER_WINDOWS) 
     struct 
     { 
      HWND window;    /**< The window handle */ 
     } win; 
#endif 
#if defined(SDL_VIDEO_DRIVER_X11) 
     struct 
     { 
      Display *display;   /**< The X11 display */ 
      Window window;    /**< The X11 window */ 
     } x11; 
#endif 
#if defined(SDL_VIDEO_DRIVER_DIRECTFB) 
     struct 
     { 
      IDirectFB *dfb;    /**< The directfb main interface */ 
      IDirectFBWindow *window; /**< The directfb window handle */ 
      IDirectFBSurface *surface; /**< The directfb client surface */ 
     } dfb; 
#endif 
#if defined(SDL_VIDEO_DRIVER_COCOA) 
     struct 
     { 
      NSWindow *window;   /* The Cocoa window */ 
     } cocoa; 
#endif 
#if defined(SDL_VIDEO_DRIVER_UIKIT) 
     struct 
     { 
      UIWindow *window;   /* The UIKit window */ 
     } uikit; 
#endif 
     /* Can't have an empty union */ 
     int dummy; 
    } info; 
}; 

#endif /* SDL_PROTOTYPES_ONLY */

我只是不知道如何正確地訪問領域的一個「匿名「聯盟。

研究我做：

維基：

http://wiki.libsdl.org/SDL_VERSION

http://wiki.libsdl.org/SDL_SysWMinfo

http://wiki.libsdl.org/SDL_GetWindowWMInfo

SO：

How to center a SDL window in Linux?

還有一些其他的stackoverflow有非常類似的代碼，它們是無關的，因爲他們也沒有工作。

驗證碼：

#include "test.h" 
#include <stdio.h> 
#include <stdlib.h> 
#include <time.h> 
#include <math.h> 

#define WIN_32_LEAN_AND_MEAN /* Trims all the fat from windows */ 
#include <windows.h> 

#define SDL_MAIN_HANDLED 

#ifndef __WIN32__ 
#define __WIN32__ 
#endif // __WIN32__ 

#include "SDL2/SDL.h" 
#include "SDL2/SDL_mixer.h" 
#include "SDL2/SDL_syswm.h" 

void get_system_data(application_data* application) 
{ 
    SDL_VERSION(&application->system_info.version); 

    if (!SDL_GetWindowWMInfo(application->window, &application->system_info)) 
     SDL_errorexit("SDL_GetWindowWMInfo", SDL_LOG_CATEGORY_ERROR); 

    switch (application->system_info.subsystem) 
    { 
     case SDL_SYSWM_WINDOWS : break; 
     default : 
      printf("Unhandled OS!\n"); 
      free_application_data(application); 
      exit(1); 
     break; 
    } 

    application->h_window = application->system_info.info.window; 

    return; 
}

我只貼出相關的代碼在這裏，如果需要，我可以發佈更多。

來源

2013-12-23 TheDelightfulEnd

完全基於struct的聲明，我會imaginge您引用HWND這樣的：

application->h_window = application->system_info.info.win.window;

來源

2013-12-23 19:41:17

SDL 2.0：如何從SDL_SysWMinfo

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