Fixed minor syntax issue in README

[haaln]

The original README example contained a small syntax/usage error that could confuse users attempting to compile the sample code directly.

This update improves the reliability of the documentation.

[Copilot]

Pull Request Overview

This PR updates the README.md documentation to improve the example code snippet for using TinyGLTF. The example code is wrapped in a complete main() function to make it more practical for users to compile and run directly.

Key changes:

• Wrapped the example code in a proper main() function with command-line argument handling
• Moved the using namespace tinygltf; declaration inside the function scope
• Added explicit return 0; for successful execution

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[Copilot]

[nitpick] The function definition should have a space before the opening brace. Change main(int /* argc */, char *argv[]){ to main(int /* argc */, char *argv[]) { to follow standard C++ formatting conventions.

Suggested change

	int main(int /* argc */, char *argv[]){
	int main(int /* argc */, char *argv[]) {

[Copilot]

The argc parameter is commented out but the code uses argv[1] on line 164 without checking if it exists. This will cause a segmentation fault if the program is run without arguments. Either uncomment argc and add a validation check like if (argc < 2), or document that the program requires at least one argument.

Suggested change

	int main(int /* argc */, char *argv[]){
	int main(int argc, char *argv[]){
	if (argc < 2) {
	printf("Usage: %s <input.gltf>\n", argv[0]);
	return -1;
	}

[haaln]

Reviewing the code example in the README, I tried to infer its intent behind it while keeping it as concise as possible, since there are plenty of examples available.

As Copilot pointed out, the example will segfault unless arguments are provided. However, I felt adding this detail would clutter the example unnecessarily.

@syoyo, what are your thought's on this?

[syoyo]

To make code minimal, I think simply use filename instead of argv[1] should suffice to show the use of TinyGLTF API.
(and remove return -1 in the last part)

so the code snippet will be like this:

// Define these only in *one* .cc file.
#define TINYGLTF_IMPLEMENTATION
#define STB_IMAGE_IMPLEMENTATION
#define STB_IMAGE_WRITE_IMPLEMENTATION
// #define TINYGLTF_NOEXCEPTION // optional. disable exception handling.
#include "tiny_gltf.h"

using namespace tinygltf;

Model model;
TinyGLTF loader;
std::string err;
std::string warn;

std::string filename = "input.gltf"; // Your glTF filename

bool ret = loader.LoadASCIIFromFile(&model, &err, &warn, filename);
//bool ret = loader.LoadBinaryFromFile(&model, &err, &warn, filename); // for binary glTF(.glb)

if (!warn.empty()) {
  printf("Warn: %s\n", warn.c_str());
}

if (!err.empty()) {
  printf("Err: %s\n", err.c_str());
}

if (!ret) {
  printf("Failed to load glTF: %s\n", filename.c_str());
}

[haaln]

Alright, I see what you mean. It seems this PR would mostly bring us back to the previous implementation, so it’s probably redundant.

Thanks for your response and work on the library.

Closing this PR.

[syoyo]

Modified the usage in this commit: 6d8bba0