//("A0 841*1189(mm)999949");
//("A1 594*841(mm)499554");
//("A2 420*594(mm)249485");
//("A3 297*420(mm)124740");
//("A4 210*297(mm)62370");
//("B3 353*500(mm)176500");
//("B4 250*353(mm)88250");
//("B6 125*176(mm)22000");
1.圖片
int[] array = { 999949, 499554, 249485, 124740, 62370};
string path = @"E:\測試格式圖片\A0.jpg";
using (System.Drawing.Image img = System.Drawing.Image.FromFile(path))
{
float dpiX = img.HorizontalResolution;
float dpiY = img.VerticalResolution;
double w = 1.0 * img.Width / dpiX * 25.4;
double h = 1.0 * img.Height / dpiY * 25.4;
string checkSize = "";
var nearest = array.OrderBy(x => Math.Abs((long)x - w * h)).First();
switch (nearest)
{
case 999949: checkSize = "A0";
break;
case 499554: checkSize = "A1";
break;
case 249485: checkSize = "A2";
break;
case 124740: checkSize = "A3";
break;
case 62370: checkSize = "A4";
break;
default: checkSize = "未判斷出";
break;
}
}
2. pdf
需引用iTextSharp.dll
https://download.csdn.net/download/weixin_42020830/87610255
string path1 = @"E:\測試格式圖片\D.3.1.2019-0782-0017.pdf";
PdfReader reader = new PdfReader(path1);
int iPageNum = reader.NumberOfPages; //獲取pdf總頁數
for (int i = 1; i < iPageNum + 1; i++)
{
string checkSize = "";
iTextSharp.text.Rectangle rc = reader.GetPageSize(i); //pdf拿到第一頁資料
float height = rc.Height; //pdf的長
float width = rc.Width;//pdf的寬
// A0 長X寬 118.9X84.1cm 10011.38
// A1 長X寬 84.1X59.4cm 4995.54
// A2 長X寬 59.4X42cm 2494.80
// A3 長X寬 42X29.7cm 1234.80
// A4 長X寬 29.7X21cm 623.70
double v1 = height * 25.4 / 72; //換算後真實高
double v2 = width * 25.4 / 72; //換算後真實寬
double v3 = v1 * v2;
var nearest = array.OrderBy(x => Math.Abs((long)x - v3)).First();
switch (nearest)
{
case 999949: checkSize = "A0";
break;
case 499554: checkSize = "A1";
break;
case 249485: checkSize = "A2";
break;
case 124740: checkSize = "A3";
break;
case 62370: checkSize = "A4";
break;
default: checkSize = "未判斷出";
break;
}
}
reader.Close(); //不關閉會一直佔用pdf資源，對接下來的操作會有影響