如何从android ndk中的sdcard加载纹理？

Question

unsigned char* GLTexture::loadTextureFromSDcard(const char* path, int* width, int* height) {
unsigned char* buf;
FILE* fp;
size_t size;

fp = fopen(path, "rb");

if (fp == NULL) return NULL;

fseek(fp, 01, SEEK_END);
size = ftell(fp);

buf = new unsigned char[size + 1];

fread(buf, size, size, fp);
fclose(fp);

*width = *(int*)&(buf[0x12]);
*height = *(int*)&(buf[0x16]);

for (int i = 0; i < size; i += 3) {
    unsigned char temp = buf[0 + i];
    buf[0 + i] = buf[2 + i];
    buf[2 + i] = temp;
}


return buf;
}

这是我的代码

错了吗？

我正在尝试将纹理加载到矩形中。

从此代码加载的纹理绘制为黑色正方形。

请给我帮助。