Jump to content
  • Advertisement
Sign in to follow this  
deathwearer

Error with LoadBMP

This topic is 4666 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

I have a structure dans hold the info i need about a tile, it has a SDL_Surface where i can store my tile. I'v made a simple function that read a files and Initialise the map with the files information. But I have a problem, in the file i read the line, the row, then the path+files. 0 0 Bleu.bmp But when i do
void CTiles::SetTile(string sNomtile)
{
	strTile.tile = SDL_LoadBMP(sNomtile);
}

I get the folowing error : c:\Documents and Settings\AUBINM\Bureau\RPG1.1\Tiles.cpp(13): error C2664: 'SDL_RWFromFile' : impossible de convertir le paramètre 1 de 'std::string' en 'const char *' which mean in english something like, Cannot convert parameter 1 from std::string to const char * . What's wrong with my code?

Share this post


Link to post
Share on other sites
Advertisement
If you want to convert a string to a const char *, you should use .c_str() function. While string is a class, a char* is just an array of chars (terminated by a '\0').


void CTiles::SetTile(string sNomtile)
{
strTile.tile = SDL_LoadBMP(sNomtile.c_str());
}


Share this post


Link to post
Share on other sites
Do what Lutyo said, but remember that often if you are not going to modify a string it will be far better to pass the string like this:
const std::string& sNomtile;
instead of:
std::string sNomtile;

The difference:
The first is passed by reference, which means the parameter probably only will be 32 bits, while the string in most cases will be much bigger, so you gain a lot of speed.

There is two cases you dont want to pass by reference:
1: When you need to use the string as a temporary, maybe like this:
string Add(string X,const string& Y)
{
X += Y;
return X;
}

Share this post


Link to post
Share on other sites
Edit: Too slow. Maybe I should just quit posting...

Also, when passing strings (or any objects) as function parameters, you should use const-references if possible.

Like this:

void CTiles::SetTile(string const & sNomtile)
{
strTile.tile = SDL_LoadBMP(sNomtile.c_str());
}


Share this post


Link to post
Share on other sites
Sign in to follow this  

  • Advertisement
×

Important Information

By using GameDev.net, you agree to our community Guidelines, Terms of Use, and Privacy Policy.

We are the game development community.

Whether you are an indie, hobbyist, AAA developer, or just trying to learn, GameDev.net is the place for you to learn, share, and connect with the games industry. Learn more About Us or sign up!

Sign me up!