C++/SDL，一切都顯示爲白色

因此，這裏是我的代碼：C++/SDL，一切都顯示爲白色

#include "stdafx.h" 


int main(int argc, char *argv[]) 
{ 
bool quit = false; 

SDL_Init(SDL_INIT_EVERYTHING); 

SDL_Window* window = NULL; 

window = SDL_CreateWindow("RPG GAME", 100, 100, 600, 400, SDL_WINDOW_SHOWN); 
if (window = NULL) 
{ 
    std::cout << "Window couldn't be created" << std::endl; 

    return 0; 

} 
SDL_Renderer* renderer = NULL; 

renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED); 

SDL_Event* mainEvent = new SDL_Event(); 
SDL_Texture* grass_image = NULL; 
grass_image = IMG_LoadTexture(renderer, "grass.bmp"); 
SDL_Rect grass_rect; 
grass_rect.x = 10; 
grass_rect.y = 50; 
grass_rect.w = 250; 
grass_rect.h = 250; 


while (!quit && mainEvent->type != SDL_QUIT) 
{ 
    SDL_PollEvent(mainEvent); 
    SDL_RenderClear(renderer); 
    //Cia darom 
    SDL_RenderCopy(renderer, grass_image, NULL, &grass_rect); 


    SDL_RenderPresent(renderer); 

} 
SDL_DestroyWindow(window); 
SDL_DestroyRenderer(renderer); 
delete mainEvent; 

return 0; 

}

每當我運行應用程序，窗口彈出，但它是全白，我最近成立了一個雙顯示器，現在有玩GIF時遇到一些問題，但我認爲這並不重要。謝謝！

來源

2015-01-02 solid2k13

咦？我很確定我設置了SDL_Texture * grass_image = NULL; – solid2k13

您需要區分'='和'=='。作爲

if (window = NULL) // bad news cause you just nuked window

與

if (window == NULL) // is window null?

來源

2015-01-02 04:52:16 maurice

說實話，儘管這是正確的，但如果發佈的代碼是他正在使用的實際代碼，該應用程序根本無法運行，它會在調用「SDL_CreateRenderer」時崩潰 – Zammalad

@Zammalad - 它可能返回null爲渲染器值而不是崩潰。請注意，發佈的代碼不檢查該情況，所以程序繼續執行，結果不佳。 – maurice

C++/SDL，一切都顯示爲白色

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