Thread overview |
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June 19, 2019 The problem with the conversion. | ||||
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Hello, users of this programming language! I have a question. I use in my application Derelict SDL 2 version 2.1.4. And when I try to specify the path to the image: void load (const (char *) path) { SDL_Surface ab = SDL_LoadBMP (path); a = SDL_CreateTextureFromSurface (ab); SDL_FreeSurface (ab); } An error occurs: "function derelict.sdl2.functions.SDL_LoadBMP (const (char) * file) is not callable using argument types (string)". Well, okay, I use in arguments: const (char *) path. Annoyed, the program still writes this error. Please help with this problem. P.S. If you see errors in spelling and stuff, then note: I am a Russian user. P.P.S. I am not familiar with this programming language. |
June 19, 2019 Re: The problem with the conversion. | ||||
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Posted in reply to Den_d_y | 19.06.2019 17:52, Den_d_y пишет:
> void load (const (char *) path)
> {
> SDL_Surface ab = SDL_LoadBMP (path);
> a = SDL_CreateTextureFromSurface (ab);
> SDL_FreeSurface (ab);
> }
try the following:
```
void load (string path)
{
import std.string : toStringz;
SDL_Surface ab = SDL_LoadBMP (path.toStringz); // toStringz converts string to null terminated char*
auto a = SDL_CreateTextureFromSurface (ab);
SDL_FreeSurface (ab);
}
```
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June 19, 2019 Re: The problem with the conversion. | ||||
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Posted in reply to drug | On Wednesday, 19 June 2019 at 14:58:44 UTC, drug wrote:
> 19.06.2019 17:52, Den_d_y пишет:
>> void load (const (char *) path)
>> {
>> SDL_Surface ab = SDL_LoadBMP (path);
>> a = SDL_CreateTextureFromSurface (ab);
>> SDL_FreeSurface (ab);
>> }
>
> try the following:
> ```
> void load (string path)
> {
> import std.string : toStringz;
> SDL_Surface ab = SDL_LoadBMP (path.toStringz); // toStringz converts string to null terminated char*
> auto a = SDL_CreateTextureFromSurface (ab);
> SDL_FreeSurface (ab);
> }
Also, the return type of SDL_LoadBMP is a pointer, SDL_Surface* not just SDL_Surface.
Indeed, in your code do use the D string path, not char*, and use toStringz when passing to C APIs.
Also, in D const(char)* would not be the same as const(char*). But don't worry about this and use string.
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June 19, 2019 Re: The problem with the conversion. | ||||
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Posted in reply to XavierAP | On Wednesday, 19 June 2019 at 17:28:38 UTC, XavierAP wrote:
>
> Also, the return type of SDL_LoadBMP is a pointer, SDL_Surface* not just SDL_Surface.
Or just use auto of course if you prefer:
void load (string path)
{
import std.string : toStringz;
auto ab = SDL_LoadBMP (path.toStringz);
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