Source: Load Image From Resource

Load Image From Resource

An example of how to load data from a Visual Studio resource script (file extension .rc) into sf::Image.

Usage

sf::Image spriteBmpImage = LoadImageFromResource("spritebmp");
sf::Image spritePngImage = LoadImageFromResource("spritepng");

resource.rc

spritebmp	RCDATA	"sprite.bmp"
spritepng	RCDATA	"sprite.png"

C++ Source

/**
 *	Creates a new sf::Image and
 *	loads it with image data from a resource (.rc) file
 */
sf::Image LoadImageFromResource(const std::string& name)
{
	HRSRC rsrcData = FindResource(NULL, name.c_str(), RT_RCDATA);
	if (!rsrcData)
		throw std::runtime_error("Failed to find resource.");
		
	DWORD rsrcDataSize = SizeofResource(NULL, rsrcData);
	if (rsrcDataSize <= 0)
		throw std::runtime_error("Size of resource is 0.");

	HGLOBAL grsrcData = LoadResource(NULL, rsrcData);
	if (!grsrcData)
		throw std::runtime_error("Failed to load resource.");

	LPVOID firstByte = LockResource(grsrcData);
	if (!firstByte)
		throw std::runtime_error("Failed to lock resource.");

	sf::Image image;
	if (!image.loadFromMemory(firstByte, rsrcDataSize))
		throw std::runtime_error("Failed to load image from memory.");

	return image;
}

Note: The shown code may lead to an unnecessary copy if the compiler doesn't support NRVO. In such a case, it would be possible to use the image as an output parameter, or return std::unique_ptr<sf::Image>.