Function saveImageFileWithNativeDialog

emain/emain-ipc.ts:133–193

(
    sender: electron.WebContents,
    defaultFileName: string,
    mimeType: string,
    readStream: Readable
)

}

function saveImageFileWithNativeDialog(
    sender: electron.WebContents,
    defaultFileName: string,
    mimeType: string,
    readStream: Readable
) {
    if (defaultFileName == null || defaultFileName == "") {
        defaultFileName = "image";
    }
    const ww = electron.BrowserWindow.fromWebContents(sender);
    if (ww == null) {
        readStream.destroy();
        return;
    }
    const mimeToExtension: { [key: string]: string } = {
        "image/png": "png",
        "image/jpeg": "jpg",
        "image/gif": "gif",
        "image/webp": "webp",
        "image/bmp": "bmp",
        "image/tiff": "tiff",
        "image/heic": "heic",
        "image/svg+xml": "svg",
    };
    function addExtensionIfNeeded(fileName: string, mimeType: string): string {
        const extension = mimeToExtension[mimeType];
        if (!path.extname(fileName) && extension) {
            return `${fileName}.${extension}`;
        }
        return fileName;
    }
    defaultFileName = addExtensionIfNeeded(defaultFileName, mimeType);
    electron.dialog
        .showSaveDialog(ww, {
            title: "Save Image",
            defaultPath: defaultFileName,
            filters: [{ name: "Images", extensions: ["png", "jpg", "jpeg", "gif", "webp", "bmp", "tiff", "heic"] }],
        })
        .then((file) => {
            if (file.canceled) {
                readStream.destroy();
                return;
            }
            const writeStream = fs.createWriteStream(file.filePath);
            readStream.pipe(writeStream);
            writeStream.on("finish", () => {
                console.log("saved file", file.filePath);
            });
            writeStream.on("error", (err) => {
                console.log("error saving file (writeStream)", err);
                readStream.destroy();
            });
            readStream.on("error", (err) => {
                console.error("error saving file (readStream)", err);
                writeStream.destroy();
            });
        })
        .catch((err) => {