相关代码:
zip_stat_t filestat;
uint64_t filetotal = 0;
SDL_RWops* rwop = SDL_AllocRW();
//bunch of code that's not relevant to the matter goes here
std::vector<char> rwbuffer(filestat.size);
rwop = SDL_RWFromMem(rwbuffer.data(), filestat.size);
while(filetotal < filestat.size)
{
char buffer[256];
int64_t length;
//read the file into the buffer
length = zip_fread(file, buffer, 256);
if (length == -1)
{
u_error(std::cerr, CC_ERROR_ZIP, "zip_fread");
zip_fclose(file);
SDL_FreeRW(rwop);
return false;
}
//write the buffer into the rwop stream
if ( (uint16_t)length != SDL_RWwrite(rwop, buffer, 1, (size_t)length) )
{
u_error(std::cerr, CC_ERROR_SDL, "SDL_RWwrite");
zip_fclose(file);
SDL_FreeRW(rwop);
return false;
}
//Increment the count so that the loop ends
filetotal += length;
}
zip_fclose(file);
//Put it onto a surface
SDL_Surface* surf_load = IMG_Load_RW(rwop, 0);
if(surf_load == NULL)
{
u_error(std::cerr, CC_ERROR_IMAGE, "IMG_Load_RW");
SDL_FreeRW(rwop);
u_cleanup(surf_load);
return false;
}
//...
我已经用调试器转储了矢量 rwbuffer 的内容,它是一个有效的 png,但 IMG_Load_RW 仍然给我一个错误“不支持的图像格式”。我已经安装了 libpng 并且 IMG_Init 似乎工作正常,所以 SDL_image 库必须工作。显然 libzip 给了我正确的数据。我很困惑为什么会出错。