在用uwp生成pdf的时候，发展此类类库有限，有的也需要钱，我最后实现pdf的底层方法生成pdf，代码如下
private async void GeneratePdf()
{ var file = await ApplicationData.Current.LocalFolder.CreateFileAsync("uwpCSharp.pdf", Windows.Storage.CreationCollisionOption.ReplaceExisting);
using (var stream = await System.IO.WindowsRuntimeStorageExtensions.OpenStreamForWriteAsync(file))
{
using (var writer = new System.IO.StreamWriter(stream, System.Text.Encoding.UTF8))
{ List<long> xrefs = new List<long>();
writer.WriteLine("%PDF-1.2");
writer.Write("%");
writer.Flush();
byte[] bytes = { , , , };
stream.Write(bytes, , );
stream.Flush();
writer.WriteLine(""); writer.Flush();
stream.Flush();
xrefs.Add(stream.Position);
writer.WriteLine("1 0 obj");
writer.WriteLine("<<");
writer.WriteLine(" /Type /Catalog");
writer.WriteLine(" /Pages 2 0 R");
writer.WriteLine(">>");
writer.WriteLine("endobj"); // #2: 页面列表 - 我们只有一页文字
writer.Flush();
stream.Flush();
xrefs.Add(stream.Position);
writer.WriteLine("2 0 obj");
writer.WriteLine("<<");
writer.WriteLine(" /Type /Pages");
writer.WriteLine(" /Kids [3 0 R]");
writer.WriteLine(" /Count 1");
writer.WriteLine(">>");
writer.WriteLine("endobj"); // #3: 页面 - 这里放文字、资源等
writer.Flush();
stream.Flush();
xrefs.Add(stream.Position);
writer.WriteLine("3 0 obj");
writer.WriteLine("<<");
writer.WriteLine(" /Type /Page");
writer.WriteLine(" /Parent 2 0 R");
writer.WriteLine(" /MediaBox [0 0 612 792]");
// 默认的用户空间: 72/inch
writer.WriteLine(" /Resources");
writer.WriteLine(" <<");
writer.WriteLine(" /ProcSet [/PDF/Text]");
// 这个pdf只有文本
writer.WriteLine(" /Font");
writer.WriteLine(" <<");
writer.WriteLine(" /F0 4 0 R");
// 定义的三种字体, #4, #5 和 #6
writer.WriteLine(" /F1 5 0 R");
writer.WriteLine(" /F2 6 0 R");
writer.WriteLine(" >>");
writer.WriteLine(" >>");
writer.WriteLine(" /Contents 7 0 R");
writer.WriteLine(">>");
writer.WriteLine("endobj"); // #4, #5, #6: 三钟字体，我们使用pdf默认字体
//使用WinAnsi字符编码，定义如下
writer.Flush();
stream.Flush();
xrefs.Add(stream.Position);
writer.WriteLine("4 0 obj");
writer.WriteLine("<<");
writer.WriteLine(" /Type /Font");
writer.WriteLine(" /Subtype /Type1");
writer.WriteLine(" /Encoding /WinAnsiEncoding");
writer.WriteLine(" /BaseFont /Times-Roman");
writer.WriteLine(">>");
writer.Flush();
stream.Flush();
xrefs.Add(stream.Position);
writer.WriteLine("5 0 obj");
writer.WriteLine("<<");
writer.WriteLine(" /Type /Font");
writer.WriteLine(" /Subtype /Type1");
writer.WriteLine(" /Encoding /WinAnsiEncoding");
writer.WriteLine(" /BaseFont /Times-Bold");
writer.WriteLine(">>");
writer.Flush();
stream.Flush();
xrefs.Add(stream.Position);
writer.WriteLine("6 0 obj");
writer.WriteLine("<<");
writer.WriteLine(" /Type /Font");
writer.WriteLine(" /Subtype /Type1");
writer.WriteLine(" /Encoding /WinAnsiEncoding");
writer.WriteLine(" /BaseFont /Times-Italic");
writer.WriteLine(">>"); // #7:内容页面。这是用postscript编写的，
// 有兴趣的朋友可以查看PDF 1.2参考手册第8章
writer.Flush();
stream.Flush();
xrefs.Add(stream.Position);
System.Text.StringBuilder sb = new System.Text.StringBuilder();
sb.AppendLine("BT");
// BT =开始文本对象
sb.AppendLine("/F0 30 Tf");
// Tf = 使用文字 "F0" 定义文字大小为 "30"
sb.AppendLine("30 TL");
// TL = 设置高度为 "30"
sb.AppendLine("140.0 780.0 Td");
// Td = 文本坐标的位置 "140.0", "780.0"
sb.AppendLine("1.0 0.0 0.6 rg");
// rg = 字体前景颜色设置
sb.AppendLine("(Microsoft Corporation India) '");
sb.AppendLine("ET"); //画线
//顶部的线
sb.AppendLine("BT");
sb.AppendLine("10 TL");
sb.AppendLine("50.0 730.0 Td");
sb.AppendLine("0.0 0.0 0.0 rg");
sb.AppendLine("(__________________________________)'");
sb.AppendLine("ET"); //左边
sb.AppendLine("BT");
sb.AppendLine("10 TL");
sb.AppendLine("47.0 703.0 Td");
sb.AppendLine("0.0 0.0 0.0 rg");
for (int i = ; i <= ; i++)
{
sb.AppendLine("(|)'");
}
sb.AppendLine("ET"); //中间的线
sb.AppendLine("BT");
sb.AppendLine("10 TL");
sb.AppendLine("240.0 703.0 Td");
sb.AppendLine("0.0 0.0 0.0 rg");
for (int i = ; i <= ; i++)
{
sb.AppendLine("(|)'");
}
sb.AppendLine("ET"); //画右边的线
sb.AppendLine("BT");
sb.AppendLine("10 TL");
sb.AppendLine("557.0 703.0 Td");
sb.AppendLine("0.0 0.0 0.0 rg");
for (int i = ; i <= ; i++)
{
sb.AppendLine("(|)'");
}
sb.AppendLine("ET"); //底部的线
sb.AppendLine("BT");
sb.AppendLine("10 TL");
sb.AppendLine("50.0 102.0 Td");
sb.AppendLine("0.0 0.0 0.0 rg");
sb.AppendLine("(__________________________________)'");
sb.AppendLine("ET"); //文字
sb.AppendLine("BT");
sb.AppendLine("/F0 15 Tf");
sb.AppendLine("20 TL");
sb.AppendLine("70.0 670.0 Td");
sb.AppendLine("0.0 0.2 1.0 rg");
sb.AppendLine("(Parameter1)'");
sb.AppendLine("ET");
//
sb.AppendLine("BT");
sb.AppendLine("/F0 15 Tf");
sb.AppendLine("20 TL");
sb.AppendLine("0.0 0.0 0.0 rg");
sb.AppendLine("260.0 670.0 Td");
sb.AppendLine("(test1) '");
sb.AppendLine("ET");
//
sb.AppendLine("BT");
sb.AppendLine("/F0 15 Tf");
sb.AppendLine("20 TL");
sb.AppendLine("0.0 0.2 1.0 rg");
sb.AppendLine("70.0 645.0 Td");
sb.AppendLine("(Parameter2)'");
sb.AppendLine("ET");
//
sb.AppendLine("BT");
sb.AppendLine("/F0 15 Tf");
sb.AppendLine("20 TL");
sb.AppendLine("0.0 0.0 0.0 rg");
sb.AppendLine("260.0 645.0 Td");
sb.AppendLine("(test2) '");
sb.AppendLine("ET");
//
sb.AppendLine("BT");
sb.AppendLine("/F0 15 Tf");
sb.AppendLine("20 TL");
sb.AppendLine("0.0 0.2 1.0 rg");
sb.AppendLine("70.0 615.0 Td");
sb.AppendLine("(Parameter3)'");
sb.AppendLine("ET");
//
sb.AppendLine("BT");
sb.AppendLine("/F0 15 Tf");
sb.AppendLine("20 TL");
sb.AppendLine("260.0 615.0 Td");
sb.AppendLine("0.0 0.0 0.0 rg");
sb.AppendLine("(test3) '");
//
//
sb.AppendLine("BT");
sb.AppendLine("/F0 15 Tf");
sb.AppendLine("20 TL");
sb.AppendLine("0.0 0.2 1.0 rg");
sb.AppendLine("70.0 575.0 Td");
sb.AppendLine("(Parameter4)'");
sb.AppendLine("ET");
//
sb.AppendLine("BT");
sb.AppendLine("/F0 15 Tf");
sb.AppendLine("20 TL");
sb.AppendLine("260.0 575.0 Td");
sb.AppendLine("0.0 0.0 0.0 rg");
sb.AppendLine("(test4) '");
sb.AppendLine("ET");
//
writer.WriteLine("7 0 obj");
writer.WriteLine("<<");
writer.WriteLine(" /Length " + sb.Length);
writer.WriteLine(">>");
writer.WriteLine("stream");
writer.Write(sb.ToString());
writer.WriteLine(" q");
writer.WriteLine(" 156 0 0 272 100 200 cm"); //[1 2 3 4 5 6 cm] translate to (5,6) and scale for 1
writer.WriteLine(" /Img1 Do");
writer.WriteLine(" Q");
writer.WriteLine("endstream");
writer.WriteLine("endobj"); writer.Flush();
stream.Flush();
dynamic xref_pos = stream.Position;
writer.WriteLine("xref");
writer.WriteLine("1 " + xrefs.Count);
long xref = ;
foreach (long xref_loopVariable in xrefs)
{
xref = xref_loopVariable;
writer.WriteLine("{0:0000000000} {1:00000} n", xref, );
} // PDF-TRAILER. PDF以这个节点结尾.
writer.WriteLine("trailer");
writer.WriteLine("<<");
writer.WriteLine(" /Size " + xrefs.Count);
writer.WriteLine(" /Root 1 0 R");
writer.WriteLine(">>");
writer.WriteLine("startxref");
writer.WriteLine(xref_pos);
writer.WriteLine("%%EOF");
}
} await Windows.System.Launcher.LaunchFileAsync(file);
}
