利用 VC# 2005 為數位照片新增拍照日期 (2) - 程式實作與 EXIF 解析

編輯：關於C語言

程式介面配置

ListBox：待處理圖片清單
TextBox：輸出資料夾路徑
五個 Button：新增圖片、清空清單、選擇輸出資料夾、開始繪製、結束
OpenFileDialog、FolderBrowserDialog

程式執行介面

核心函數實作

1. 取得 EXIF 中繼資料

public static PropertyItem[] GetExifProperties(string fileName)
{
    FileStream stream = new FileStream(fileName, FileMode.Open, FileAccess.Read);
    System.Drawing.Image image = System.Drawing.Image.FromStream(stream, true, false);
    return image.PropertyItems;
}

2. 解析拍照日期時間 (ID=0x0132)

private string GetTakePicDateTime(PropertyItem[] parr)
{
    Encoding ascii = Encoding.ASCII;
    foreach (PropertyItem p in parr)
    {
        if (p.Id == 0x0132) // PropertyTagDateTime
            return ascii.GetString(p.Value);
    }
    return "N/A";
}

3. 批次處理繪製日期浮水印

for (int i = 0; i < listBox1.Items.Count; i++)
{
    pi = GetExifProperties(listBox1.Items[i].ToString());
    TakePicDateTime = GetTakePicDateTime(pi);
    
    // 格式化：2006:06:07 16:33:41 → 2006-06-07 16:33:41
    SpaceLocation = TakePicDateTime.IndexOf(" ");
    dt = TakePicDateTime.Substring(0, SpaceLocation).Replace(":", "-");
    tm = TakePicDateTime.Substring(SpaceLocation + 1, TakePicDateTime.Length - SpaceLocation - 2);
    TakePicDateTime = dt + " " + tm;
    
    Pic = new Bitmap(listBox1.Items[i].ToString());
    g = Graphics.FromImage(Pic);
    g.DrawString(TakePicDateTime, normalContentFont, new SolidBrush(normalContentColor),
                 Pic.Width - 700, Pic.Height - 200);
    Pic.Save(textBox1.Text + Path.GetFileName(listBox1.Items[i].ToString()));
    Pic.Dispose();
}