Add examples for Visual C++ MFC (#208)

mfc-examples/StreamingSpeechRecognition/StreamingSpeechRecognitionDlg.h

@@ -0,0 +1,80 @@
+
+// StreamingSpeechRecognitionDlg.h : header file
+//
+
+#pragma once
+
+#include <string>
+
+#include "portaudio.h"
+#include "sherpa-onnx/c-api/c-api.h"
+
+class Microphone {
+ public:
+  Microphone();
+  ~Microphone();
+};
+
+class RecognizerThread;
+
+// CStreamingSpeechRecognitionDlg dialog
+class CStreamingSpeechRecognitionDlg : public CDialogEx {
+  // Construction
+ public:
+  CStreamingSpeechRecognitionDlg(
+      CWnd *pParent = nullptr);  // standard constructor
+  ~CStreamingSpeechRecognitionDlg();
+
+// Dialog Data
+#ifdef AFX_DESIGN_TIME
+  enum { IDD = IDD_STREAMINGSPEECHRECOGNITION_DIALOG };
+#endif
+
+ protected:
+  virtual void DoDataExchange(CDataExchange *pDX);  // DDX/DDV support
+
+  // Implementation
+ protected:
+  HICON m_hIcon;
+
+  // Generated message map functions
+  virtual BOOL OnInitDialog();
+  afx_msg void OnPaint();
+  afx_msg HCURSOR OnQueryDragIcon();
+  DECLARE_MESSAGE_MAP()
+ private:
+  Microphone mic_;
+
+  SherpaOnnxOnlineRecognizer *recognizer_ = nullptr;
+
+  PaStream *pa_stream_ = nullptr;
+  RecognizerThread *thread_;
+  CButton my_btn_;
+  CEdit my_text_;
+
+ public:
+  bool started_ = false;
+  SherpaOnnxOnlineStream *stream_ = nullptr;
+
+ public:
+  int RunThread();
+  afx_msg void OnBnClickedOk();
+
+ private:
+  void AppendTextToEditCtrl(const std::string &s);
+  void AppendLineToMultilineEditCtrl(const std::string &s);
+  void InitMicrophone();
+
+  bool Exists(const std::string &filename);
+  void InitRecognizer();
+};
+
+class RecognizerThread : public CWinThread {
+ public:
+  RecognizerThread(CStreamingSpeechRecognitionDlg *dlg) : dlg_(dlg) {}
+  virtual BOOL InitInstance() { return TRUE; }
+  virtual int Run() { return dlg_->RunThread(); }
+
+ private:
+  CStreamingSpeechRecognitionDlg *dlg_;
+};