www.digitalmars.com         C & C++   DMDScript  

digitalmars.D.learn - raylib LoadTexture Mismatch between

reply Decabytes <mycontributiontotheworld gmail.com> writes:
Dlang and curly brace language noob here. I'm trying to work with 
the raylib-d library. I downloaded raylib-d using dub, and I 
installed raylib with my package manager on Manjaro.  I'm getting 
a mismatch in the arguments I'm passing to LoadTexture.

source/app.d(7,32): Error: function 
raylib.LoadTexture(const(char)* fileName) is not callable using 
argument types (string)

In the raylib-d docs/cheatsheet it says LoadTexture uses a string 
as an argument.The original raylib docs/cheatsheet says it's a 
const(char)* value. So it seems I'm using the C version instead 
of the D version? The relevant section of the code below is

import raylib;

void main()
{
	InitWindow(800, 600, "Hello, Raylib-D!");
	string fname = "assets/tile_022.png";
	Texture2D player = LoadTexture(fname);
	while (!WindowShouldClose()){
         ...
	
}



{
         "authors": [
                 "Me"
         ],
         "copyright": "Copyright © 2021, Me",
         "dependencies": {
                 "raylib-d": "~>3.0.3"
         },
         "description": "A minimal D application.",
         "libs": [
                 "raylib"
         ],
         "license": "proprietary",
         "name": "raylib_test"
}

Does anyone know why this is happening?
Feb 19
parent reply Steven Schveighoffer <schveiguy gmail.com> writes:
On 2/19/21 5:26 PM, Decabytes wrote:
 Dlang and curly brace language noob here. I'm trying to work with the 
 raylib-d library. I downloaded raylib-d using dub, and I installed 
 raylib with my package manager on Manjaro.  I'm getting a mismatch in 
 the arguments I'm passing to LoadTexture.
 
 source/app.d(7,32): Error: function raylib.LoadTexture(const(char)* 
 fileName) is not callable using argument types (string)
 
 In the raylib-d docs/cheatsheet it says LoadTexture uses a string as an 
 argument.The original raylib docs/cheatsheet says it's a const(char)* 
 value. So it seems I'm using the C version instead of the D version? The 
 relevant section of the code below is
 
 import raylib;
 
 void main()
 {
      InitWindow(800, 600, "Hello, Raylib-D!");
      string fname = "assets/tile_022.png";
      Texture2D player = LoadTexture(fname);
raylib-d does not have D wrappers for everything. You are supposed to use the C functions. D's string literals are null-terminated. However, the language only allows actual literals to be implicitly converted to immutable(char)* as literals, not as general strings. So this will work: Texture2D player = LoadTexture("assets/tile_022.png"); And this will work too (because string literals are null terminated): string fname = "assets/tile_022.png"; Texture2D player = LoadTexture(fname.ptr); If you have a string that you aren't sure is a string literal, you can use std.string.toStringz to convert it, but this will allocate another string (possibly). import std.string; Texture2D player = LoadTexture(fname.toStringz); -Steve
Feb 19
parent Decabytes <mycontributiontotheworld gmail.com> writes:
On Friday, 19 February 2021 at 23:29:18 UTC, Steven Schveighoffer 
wrote:
 On 2/19/21 5:26 PM, Decabytes wrote:
 raylib-d does not have D wrappers for everything. You are 
 supposed to use the C functions.

 D's string literals are null-terminated. However, the language 
 only allows actual literals to be implicitly converted to 
 immutable(char)* as literals, not as general strings.

 So this will work:

 Texture2D player = LoadTexture("assets/tile_022.png");

 And this will work too (because string literals are null 
 terminated):

 string fname = "assets/tile_022.png";
 Texture2D player = LoadTexture(fname.ptr);

 If you have a string that you aren't sure is a string literal, 
 you can use std.string.toStringz to convert it, but this will 
 allocate another string (possibly).

 import std.string;
 Texture2D player = LoadTexture(fname.toStringz);

 -Steve
I see now. Thank you Steve!
Feb 19