在c＃中上传时在图像上添加日期

Question

I am adding date and image to the database. I want to add the date as the footer to the uploaded image.

HTML for image upload

<div class="form-group">
    @Html.Label("Photo", htmlAttributes: new { @class = "control-label" })
    <div class="col-md-10">
        <img id="DocImg" src="~/Upload/DoctorImage/doc-default.png" style="cursor: pointer;"  accesskeyclass="edtImg" width="100" height="100" />
        <input type="file" id="fileUpload" name="Photo" accept="image/*" />
    </div>
</div>

HTML for datepicker

 <div class="col-6">
    @Html.ValidationSummary(true, "", new { @class = "text-danger"})
    <div class="form-group">
        @Html.Label("Joining Date", htmlAttributes: new { @class = "control-label col-md-2", @required = "required" })
        <div class="col-md-10">
            @(Html.Kendo().DatePicker()
                            .Name("JoiningDate")
                            .Value("")
                            .HtmlAttributes(new { style = "width: 100%", required = "true" })
            )
            @Html.ValidationMessageFor(model => model.JoiningDate, "", new { @class = "text-danger" })
        </div>
    </div>
</div>

Script for Upload

$(document).ready(function () {
    $("#fileUpload").hide();
});

$("#DocImg").click(function () {
    $("#fileUpload").trigger('click');
});

Answer 1

I think you need to manipulate the image in the DOM before the post completes, using ajax to accomplish it

Having this in mind, all you need is to use a canvas to render the text from the datepicker inside the image.

As shown in the code -

 var canvasEl = document.getElementById('canvas'); var ctx = canvas.getContext('2d'); canvasEl.width = $('img').width(); canvasEl.crossOrigin = "Anonymous"; canvasEl.height = $('img').height(); ctx.drawImage($('img').get(0), 0, 0); ctx.font = "36pt Verdana"; $(document).on('input','#inp',function(){ //redraw image ctx.clearRect(0,0,canvasEl.width,canvasEl.height); ctx.drawImage($('img').get(0), 0, 0); //refill text ctx.fillStyle = "red"; ctx.fillText($(this).val(),40,80); //positioning text wherever you want }); $('button').click(function(){ console.log(ctx.getImageData(50, 50, 100, 100)); }); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <form> <img style="display:none" src="https://encrypted-tbn2.gstatic.com/images?q=tbn:ANd9GcTsEbEB4kEMHt3WJ13HpZE16hJ3iKrE8ugnErvyln7oNPDma48U" crossorigin="anonymous"/> <input type="text" id="inp"/> <button type="submit">Save</button> </form> <canvas id="canvas" /> 

Please share if it works for you?

Answer 2

You gonna need a reference to System.Drawing and play a little bit with graphics. I just authored a solution for you so it isn't bulletproof. You might wanna play around to change the colors, font, etc. as well as add exception handling.

public void AddWatermark(string inputhPath, string outputPath)
{
    var wm = DateTime.Now.ToShortDateString();

    using (var bmp = Bitmap.FromFile(inputhPath))
    using (var g = Graphics.FromImage(bmp))
    using (var transparentBrush = new SolidBrush(Color.FromArgb(164, 0, 0, 0)))
    using (var font = new Font("Calibri", 20, FontStyle.Bold, GraphicsUnit.Pixel))
    {
        var format = new StringFormat(StringFormatFlags.NoWrap);
        var dim = g.MeasureString(wm, font);
        var loc = new Point(bmp.Width - (int)dim.Width - 20, bmp.Height - (int)dim.Height * 2);

        g.DrawString(wm, font, transparentBrush, loc);

        bmp.Save(outputPath);
    }
}