feat: 영수증 인쇄를 TCP→DLL 방식으로 전환

TCP 소켓(PRINTSTART/PRINTEND) 대신 AllThatPayCatReqMC(iCmd=2)로
DLL→MMF 경유 인쇄. GW 포트 변경에 영향받지 않음.

- ProcessPrint: TCP 소켓 제거, DLL CatReqMC(2) 호출로 대체
- FindGWPort: 8080/7779 포트 제외 로직 추가
- 실패 시 FindGWPort+ConnectDLL 재연결 후 1회 재시도
- build.bat, test_print_dll.ps1 추가 (DLL 인쇄 단독 테스트용)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

PaymentBridge.cs

@@ -110,7 +110,9 @@ namespace PaymentBridge
                                 var addr = parts[1];
                                 if (addr.Contains(":"))
                                 {
-                                    GW_PORT = addr.Split(':')[1];
+                                    string port = addr.Split(':')[1];
+                                    if (port == "8080" || port == "7779") continue; // 웹UI/Bridge 포트 제외
+                                    GW_PORT = port;
                                     Log("GW Port found: " + GW_PORT);
                                     break;
                                 }
@@ -220,6 +222,12 @@ namespace PaymentBridge
                     var data = json.Deserialize<dynamic>(body);
                     responseString = ProcessCashReceipt("B2", data);
                 }
+                else if (path == "/api/print" && request.HttpMethod == "POST")
+                {
+                    var body = ReadBody(request);
+                    var data = json.Deserialize<dynamic>(body);
+                    responseString = ProcessPrint(data);
+                }
                 else
                 {
                     responseString = json.Serialize(new { ok = false, error = "Unknown endpoint" });
@@ -419,6 +427,89 @@ namespace PaymentBridge
             Console.WriteLine(message);
         }
         
+        static string ProcessPrint(dynamic data)
+        {
+            // POS에서 받은 영수증 데이터를 DLL 경유로 인쇄 (MMF → AllthatpayClient → 프린터)
+            // data: { text: "영수증텍스트", qr_url: "https://...", qr_points: 100 }
+
+            try
+            {
+                string text = "";
+                string qrUrl = "";
+                int qrPoints = 0;
+
+                try { text = data["text"] ?? ""; } catch { }
+                try { qrUrl = data["qr_url"] ?? ""; } catch { }
+                try { qrPoints = Convert.ToInt32(data["qr_points"]); } catch { }
+
+                if (string.IsNullOrEmpty(text))
+                    return json.Serialize(new { ok = false, error = "text is empty" });
+
+                // QR 적립 안내 텍스트 추가
+                if (!string.IsNullOrEmpty(qrUrl) && qrPoints > 0)
+                {
+                    text += "\n------------------------------------------------\n";
+                    text += "          ★ 마일리지 적립 ★\n";
+                    text += "   QR 스캔하고 " + qrPoints.ToString("N0") + "P 받으세요!\n";
+                    text += "         (유효기간: 30일)\n";
+                    text += "------------------------------------------------\n";
+                }
+
+                // EUC-KR 인코딩
+                Encoding eucKr = Encoding.GetEncoding("euc-kr");
+                byte[] textBytes = eucKr.GetBytes(text);
+
+                // 패킷 조립: text + FS×4 + ATQR_URL (DLL 방식 — PRINTSTART/END 불필요)
+                var packet = new System.Collections.Generic.List<byte>();
+                packet.AddRange(textBytes);
+
+                // QR 코드 추가 (ATQR_ 프로토콜)
+                if (!string.IsNullOrEmpty(qrUrl))
+                {
+                    byte fs = 0x1C;
+                    packet.Add(fs); packet.Add(fs); packet.Add(fs); packet.Add(fs);
+                    packet.AddRange(Encoding.ASCII.GetBytes("ATQR_" + qrUrl));
+                }
+
+                byte[] buf = packet.ToArray();
+
+                // DLL 미연결 시 재연결
+                if (!isConnected)
+                {
+                    FindGWPort();
+                    ConnectDLL();
+                }
+
+                // DLL 경유 인쇄 (iCmd=2)
+                int result = AllThatPayCatReqMC(2, buf, buf.Length);
+
+                if (result != 0)
+                {
+                    Log("Print OK (DLL): " + text.Length + " chars, QR=" + (!string.IsNullOrEmpty(qrUrl)));
+                    return json.Serialize(new { ok = true, method = "dll", has_qr = !string.IsNullOrEmpty(qrUrl), bytes_sent = buf.Length });
+                }
+
+                // DLL 실패 → 재연결 후 1회 재시도
+                Log("Print DLL failed, reconnecting...");
+                FindGWPort();
+                ConnectDLL();
+
+                result = AllThatPayCatReqMC(2, buf, buf.Length);
+                if (result != 0)
+                {
+                    Log("Print OK (DLL retry): " + text.Length + " chars, QR=" + (!string.IsNullOrEmpty(qrUrl)));
+                    return json.Serialize(new { ok = true, method = "dll_retry", has_qr = !string.IsNullOrEmpty(qrUrl), bytes_sent = buf.Length });
+                }
+
+                return json.Serialize(new { ok = false, error = "DLL CatReqMC(2) returned 0" });
+            }
+            catch (Exception ex)
+            {
+                Log("ProcessPrint error: " + ex.Message);
+                return json.Serialize(new { ok = false, error = ex.Message });
+            }
+        }
+
         static void Cleanup()
         {
             try

build.bat

@@ -0,0 +1,8 @@
+@echo off
+cd /d "%~dp0"
+C:\Windows\Microsoft.NET\Framework\v4.0.30319\csc.exe /nologo /platform:x86 /target:winexe /win32icon:shc.ico /reference:System.dll /reference:System.Drawing.dll /reference:System.Windows.Forms.dll /reference:System.Web.Extensions.dll /out:PaymentBridge.exe PaymentBridge.cs
+if %errorlevel%==0 (
+    echo BUILD SUCCESS
+) else (
+    echo BUILD FAILED
+)

test_print_dll.ps1

@@ -0,0 +1,105 @@
+# 32비트 PowerShell에서 AllthatModule.dll iCmd=2 영수증출력 테스트
+# 실행: C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe -ExecutionPolicy Bypass -File test_print_dll.ps1
+
+Add-Type -TypeDefinition @"
+using System;
+using System.Runtime.InteropServices;
+
+public class AllThatPay {
+    private const string DLL = @"C:\Program Files (x86)\AllthatpayClient\AllthatModule.dll";
+
+    [DllImport(DLL, CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
+    public static extern int AllThatPayOpenModule(string gwIp, string gwPort, string atpIp, string atpPort, string bizNo, string ediType, int optFlag);
+
+    [DllImport(DLL, CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)]
+    public static extern int AllThatPayCloseModule();
+
+    [DllImport(DLL, CallingConvention = CallingConvention.StdCall)]
+    public static extern int AllThatPayCatReqMC(int iCmd, byte[] pInBuf, int iInLength);
+
+    [DllImport(DLL, CallingConvention = CallingConvention.StdCall)]
+    public static extern int AllThatPayRetCon();
+
+    [DllImport(DLL, CallingConvention = CallingConvention.StdCall)]
+    public static extern IntPtr AllThatPayRetData(int iPosition);
+}
+"@
+
+# --- GW 포트 자동 탐지 ---
+$gwPort = $null
+$proc = Get-Process -Name "AllthatpayClient" -ErrorAction SilentlyContinue | Select-Object -First 1
+if ($proc) {
+    $netstat = netstat -ano 2>$null
+    foreach ($line in $netstat) {
+        if ($line -match "LISTENING" -and $line -match "\s$($proc.Id)\s*$") {
+            if ($line -match ":(\d+)\s") {
+                $port = [int]$Matches[1]
+                if ($port -ne 8080 -and $port -ne 7779) {
+                    $gwPort = $port.ToString()
+                    break
+                }
+            }
+        }
+    }
+}
+
+if (-not $gwPort) {
+    Write-Host "[ERROR] GW port not found" -ForegroundColor Red
+    exit 1
+}
+Write-Host "[INFO] GW Port: $gwPort" -ForegroundColor Cyan
+
+# --- DLL 연결 ---
+$r = [AllThatPay]::AllThatPayOpenModule("127.0.0.1", $gwPort, "", "", "8134500294", "P01", 0)
+Write-Host "[INFO] OpenModule: $r (1=OK)" -ForegroundColor $(if ($r -eq 1) {"Green"} else {"Red"})
+
+if ($r -ne 1) {
+    Write-Host "[ERROR] OpenModule failed" -ForegroundColor Red
+    exit 1
+}
+
+# --- 영수증 텍스트 (EUC-KR) ---
+$eucKr = [System.Text.Encoding]::GetEncoding("euc-kr")
+
+$text = "================================================`n"
+$text += "            [ 청 춘 약 국 ]`n"
+$text += "     경기 양주시 양주역로 7-3 1층`n"
+$text += "          TEL: 033-481-7390`n"
+$text += "================================================`n"
+$text += "`n"
+$text += "  ** DLL iCmd=2 인쇄 테스트 **`n"
+$text += "  시간: $(Get-Date -Format 'yyyy-MM-dd HH:mm:ss')`n"
+$text += "`n"
+$text += "------------------------------------------------`n"
+$text += "          ★ 마일리지 적립 ★`n"
+$text += "   QR 스캔하고 100P 받으세요!`n"
+$text += "         (유효기간: 30일)`n"
+$text += "------------------------------------------------`n"
+$text += "`n`n"
+
+$textBytes = $eucKr.GetBytes($text)
+
+# --- QR 코드 추가: FS×4 + ATQR_URL (명세서 CMD 2 규격) ---
+$qrUrl = "https://shc.pharmq.kr/claim?t=test_dll_print"
+[byte]$fs = 0x1C
+$qrTag = $eucKr.GetBytes("ATQR_" + $qrUrl)
+
+$buf = New-Object System.Collections.Generic.List[byte]
+$buf.AddRange($textBytes)
+$buf.Add($fs); $buf.Add($fs); $buf.Add($fs); $buf.Add($fs)
+$buf.AddRange($qrTag)
+$packet = $buf.ToArray()
+
+Write-Host "[INFO] iCmd=2 send ($($packet.Length) bytes, text=$($textBytes.Length) + QR=$($qrTag.Length))..." -ForegroundColor Yellow
+
+# --- iCmd=2 영수증출력 ---
+try {
+    $pr = [AllThatPay]::AllThatPayCatReqMC(2, $packet, $packet.Length)
+    Write-Host "[INFO] CatReqMC(2): $pr" -ForegroundColor $(if ($pr -ne 0) {"Green"} else {"Red"})
+} catch {
+    Write-Host "[ERROR] CatReqMC exception: $_" -ForegroundColor Red
+}
+
+# --- 정리 ---
+try { [AllThatPay]::AllThatPayCloseModule() | Out-Null } catch {}
+Write-Host "[DONE]" -ForegroundColor Cyan