Question

winform 如何遍历目录下所有JPG\PNG格式的图片并逐张打印？

Answer 1

分为三步：

1. 拖一个打印控件，添加打印事件
   

2. 遍历目录，获取所有以JPG和PNG为后缀名的文件路径数组

3. 开始打印，设置打印附加页，一次性打印完

下面是代码：

   private string[] m_FileList; //存储图片的数组
        private int i = 0;//记录开始

        private void btn_begin_Click(object sender, EventArgs e)
        {
            string l_strFileDir = "";//你自己的路径 
            FolderBrowserDialog dlg = new FolderBrowserDialog();
            dlg.ShowNewFolderButton = false;
            dlg.Description = "选择图片文件夹";
            if (dlg.ShowDialog() == DialogResult.OK)
            {
                l_strFileDir = dlg.SelectedPath;
            }
            else
            {
                return;
            }

            //获取该目录下所有的jpg和png图片 没有测试大小写
            string[] FileList = Directory.GetFiles(l_strFileDir, "*.jpg", SearchOption.AllDirectories);
            string[] FileList1 = Directory.GetFiles(l_strFileDir, "*.PNG", SearchOption.AllDirectories);
            m_FileList = FileList.Concat(FileList1).ToArray();
            PrintDialog MyPrintDg = new PrintDialog();
            MyPrintDg.Document = printDocument1;
            MyPrintDg.AllowSomePages = true;
            if (MyPrintDg.ShowDialog() == DialogResult.OK)
            {
                try
                {
                    printDocument1.Print();
                }
                catch
                {   //停止打印
                    printDocument1.PrintController.OnEndPrint(printDocument1, new System.Drawing.Printing.PrintEventArgs());
                }
            }
            }
  
     private void printDocument1_PrintPage_1(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
            try
            {
                if (i < m_FileList.Length)
                {
                    e.Graphics.DrawImageUnscaled(Image.FromFile(m_FileList[i]), e.PageBounds);
                    e.HasMorePages = true; //设置是否继续打印附加页面
                    i++;
                    if (i == m_FileList.Length)
                    {
                        e.HasMorePages = false;
                    }
                }
                //e.Graphics.DrawImage(pictureBox1.Image, 20, 20);
            }
            catch (Exception exception)
            {
                Console.WriteLine(exception);
            }
        }

Answer 2

给你提供一个文件夹遍历图片的方法，打印自己找找C#有没有什么api

//图片过滤器
public string PictureFilter = ".bmp;.BMP;.jpg;.JPG;.jpeg;JPEG;.gif;.GIF;.png;.PNG;";

//递归遍历目录下所有图片文件的列表
public static void GetFileNames(string pathname, List<string> fileList)
{
string[] subFiles = Directory.GetFiles(pathname);
foreach (string subFile in subFiles)
{
if (Util.IsValidFile(subFile, App.iCommCfg.PictureFilter))
{
fileList.Add(subFile);
Console.WriteLine(subFile);
}
}

string[] subDirs = Directory.GetDirectories(pathname);
foreach (string subDir in subDirs)
{
GetFileNames(subDir, fileList);
}
}