SDL_Image libpng的錯誤：沒有一個PNG文件

Question

我試着用SDL_Image加載png圖片：

代碼

int fname_len = 1024; 
char fname[fname_len]; 
string pwd = getcwd(fname,fname_len); 

strcat(fname,"/i/avatar.png"); 
struct stat buf; 
if(stat(fname, &buf)) error("File does not exists",fname); 

SDL_RWops *rwop = SDL_RWFromFile(fname, "rb"); 

SDL_Surface *img = 0; 
img = IMG_LoadPNG_RW(rwop); // 6 
if(!img) error("Failed to load",fname); 

SDL_Texture *tx = tex[z] = SDL_CreateTextureFromSurface(ren, img); // 5 
SDL_FreeSurface(img); // ~6 
if(!tx) error("Failed to create texture from",fname); 

項目文件

LIBS += -L/usr/lib -lSDL2 -lSDL_image 

當我運行它，它顯示錯誤：

Failed to load '/tmp/mygame/i/avatar.png': Error reading the PNG file. 
libpng error: Not a PNG file 

wh恩它嘗試運行file命令，它確實存在：

# file /tmp/mygame/i/avatar.png 
/tmp/mygame/i/avatar.png: PNG image data, 34 x 24, 8-bit/color RGBA, non-interlaced 

ldd命令的結果是：

# ldd /tmp/mygame/mygame 
    linux-vdso.so.1 (0x00007fffe9400000) 
    libSDL2-2.0.so.0 => /usr/lib/libSDL2-2.0.so.0 (0x00007f0dd39b0000) 
    libSDL_image-1.2.so.0 => /usr/lib/libSDL_image-1.2.so.0 (0x00007f0dd3790000) 
    libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x00007f0dd3488000) 
    libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0x00007f0dd3270000) 
    libc.so.6 => /usr/lib/libc.so.6 (0x00007f0dd2ec8000) 
    libm.so.6 => /usr/lib/libm.so.6 (0x00007f0dd2bc0000) 
    libdl.so.2 => /usr/lib/libdl.so.2 (0x00007f0dd29b8000) 
    libpthread.so.0 => /usr/lib/libpthread.so.0 (0x00007f0dd2798000) 
    librt.so.1 => /usr/lib/librt.so.1 (0x00007f0dd2590000) 
    libSDL-1.2.so.0 => /usr/lib/libSDL-1.2.so.0 (0x00007f0dd22f8000) 
    /lib64/ld-linux-x86-64.so.2 (0x00007f0dd3c98000) 

安裝和安裝的libpng *圖書館在我的電腦上：

1 extra/libpng 1.6.9-1 [installed] 
2 community/libpng12 1.2.50-4 [installed] 
3 multilib/lib32-libpng 1.6.8-1 [installed] 
4 multilib/lib32-libpng12 1.2.50-2 [installed] 
5 catalyst/libpng12 1.2.50-1 
6 aur/devkitppc-portlibs-libpng 1.5.4-2 (6) 
7 aur/k3d-libpng.patch 0.8.0.1-1 (2) 
8 aur/lib32-libpng14 1.4.12-1 (93) 
9 aur/lib32-libpng15 1.5.18-1 (34) 
10 aur/libpng-old 1.0.2-2 (8) 
11 aur/libpng14 1.4.13-2 [installed] (251) 
12 aur/libpng15 1.5.18-1 (121) 

我做錯了哪一部分？

Answer 1

從註釋轉換：

的問題是，你對SDL2和SDL_image聯繫。後者是1.2 version of the library，意思是與SDL 1.2兼容。

當使用SDL2，總是使用它的庫，例如的SDL2版本SDL2_image，SDL2_mixer等。