I have successfully compiled a JS program from C++ files using emscripten, and it generates a PNG file.
The program is now being loaded and run in an HTML file.
However, I am facing a challenge in displaying the generated PNG file within this HTML file. Emscripten utilizes an emulated sandboxed filesystem, and my PNG file ends up being stored in this filesystem.
What is the best way to retrieve this file and display it in the HTML file?
To access the file, you can utilize the emscripten's File System API.
Assuming you have a C++ function that provides the path to your PNG file, it may look something like this:
std::string processImage()
{
std::string filename = "my.png";
// Do something with the file
return filename;
}
In your HTML file, you can use JavaScript to read the file, convert it to a blob, and then create a URL for it:
const filename = Module.processImage(); // Call your C++ function
const blob = new Blob([FS.readFile(filename)], {'type': 'image/png'});
const url = URL.createObjectURL(blob);
// You can set this URL as the src attribute of an img tag
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