今天试写了个sdl的简单程序，其中用了个CreateTextureFromSurface(),可是Texture死活创建不了，其实就是一个非常小、非常简单的程序，实在看不出有啥错。
我先简单描述下这个小程序的套路，首先声明窗口、渲染器、表面、贴图的几个空指针，然后创建窗口、渲染器，再用IMG_Load建了个表面，经程序反馈信息，这个表面是创建成功的，然后就用这个表面来生成贴图，然而就在这一步跪了……，根据反馈，这个贴图的值是NULL的(老是NULL)，也就是创建失败～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～～有没有大神知道，像这种情况，有哪些可能会导致贴图创建失败，求科普，求解答(翻了很多资料，还是没搞清楚，只好求助)

#include "SDL.h"
#include "SDL_image.h"
#include "stdio.h"
SDL_Window *win = NULL;
SDL_Renderer *ren = NULL;
SDL_Texture *tex = NULL;
SDL_Surface *sur = NULL;
SDL_Event event;
SDL_Rect src={34,0,34,48};
SDL_Rect dst={50,50,34,48};
char quit = 0;
char stop = 1;
int flag = 0;

void Destroy(void)
{
SDL_FreeSurface(sur);
SDL_DestroyTexture(tex);
SDL_DestroyWindow(win);
SDL_DestroyRenderer(ren);
IMG_Quit();
SDL_Quit();
}
int Init(SDL_Window *window,SDL_Renderer *renderer)
{
if(SDL_Init(SDL_INIT_VIDEO|SDL_INIT_TIMER) != 0)
return -1;
IMG_Init(IMG_INIT_PNG);
window = SDL_CreateWindow("GAME",300,300,200,200,SDL_WINDOW_SHOWN);
renderer = SDL_CreateRenderer(window,-1,SDL_RENDERER_ACCELERATED);
if((window == NULL) || (renderer == NULL))
return -1;
return 0;
}

int CheckKey(void)
{
while(quit == 0)
{
while(SDL_PollEvent(&event) != 0)
{
if(event.type == SDL_KEYDOWN)
{
switch(event.key.keysym.sym)
{
case SDLK_UP:{dst.y-=5;flag = 1;stop = 0;break;}
case SDLK_DOWN:{dst.y+=5;flag = 2;stop = 0;break;}
case SDLK_LEFT:{dst.x-=5;flag = 3;stop = 0;break;}
case SDLK_RIGHT:{dst.x+=5;flag = 4;stop = 0;break;}
case SDLK_ESCAPE:{quit = 1;break;}
default:break;
}
}
if(event.type == SDL_KEYUP)
{
stop = 0;
}
}
}
return 0;
}

int main(int args,char *argv[])
{
if(Init(win,ren) != 0)
return -1;
//WINsur = SDL_GetWindowSurface(win);
sur = IMG_Load("001.png");
//NEWsur = SDL_ConvertSurface(sur,WINsur->format,0);
tex = SDL_CreateTextureFromSurface(ren,sur);
if(sur == NULL)
{
printf("Surface Create failed!");
SDL_Delay(3000);
return -1;
}
if(tex == 0)//主要问题在这里
{
printf("Texture Create failed!");
SDL_Delay(3000);
return -1;
}

win = SDL_GetKeyboardFocus();
CheckKey();
int j;
if(flag == 1 && stop == 0)
{
src.y = 144;
for(j = 0;j<3;j++)
{
SDL_RenderClear(ren);
SDL_RenderCopy(ren,tex,&src,&dst);
SDL_RenderPresent(ren);
SDL_Delay(200);
src.x += 34;
}
src.x = 34;
}
if(flag == 2 && stop == 0)
{
src.y = 0;
for(j = 0;j<3;j++)
{
SDL_RenderClear(ren);
SDL_RenderCopy(ren,tex,&src,&dst);
SDL_RenderPresent(ren);
SDL_Delay(1000);
src.x += 34;
}
src.x = 34;
}
if(flag == 3 && stop == 0)
{
src.y = 48;
for(j = 0;j<3;j++)
{
SDL_RenderClear(ren);
SDL_RenderCopy(ren,tex,&src,&dst);
SDL_RenderPresent(ren);
SDL_Delay(200);
src.x += 34;
}
src.x = 34;
}
if(flag == 4 && stop == 0)
{
src.y = 96;
for(j = 0;j<3;j++)
{
SDL_RenderClear(ren);
SDL_RenderCopy(ren,tex,&src,&dst);
SDL_RenderPresent(ren);
SDL_Delay(200);
src.x += 34;
}
src.x = 34;
}
Destroy();
return 0;
}

就这么个程序，出问题的地方已注出

surface不是空，SDL_CreateTexture却创建失败，
你在tex == 0
{
//这里添加
printf("%s", SDL_GetError());
}
看具体是什么错误

还真是renderer有问题，好吧，搞了半天是自己自以为是了，这个Init函数不能这样写，c语言基础不扎实，真是麻烦各位了

int Init(void)
{
if(SDL_Init(SDL_INIT_VIDEO|SDL_INIT_TIMER) != 0)
return -1;
IMG_Init(IMG_INIT_PNG);
win = SDL_CreateWindow("GAME",300,300,200,200,SDL_WINDOW_SHOWN);
ren = SDL_CreateRenderer(win,-1,SDL_RENDERER_ACCELERATED);
if((win == NULL) || (ren == NULL))
return -1;
return 0;
}

win 和ren是指针，默认指向空或者无效区间，应该是init(&win,&ren)去获取指针的地址，如果这个不好理解的话就用全局变量吧