fork download

class CMyWindow : public CFrameWnd
{
public:
	CMyWindow();
 
	DECLARE_MESSAGE_MAP()
	afx_msg void OnEnd();
	afx_msg void OnAbout();
	afx_msg void OnPaint();
	afx_msg void OnDropFiles(HDROP hDropInfo);
	afx_msg void OnFileOpen();
private:
	CImage m_image;
	// 画像を読み込む
	bool LoadImage(CString filename);
};
 
void CMyWindow::OnPaint()
{
	CPaintDC dc(this); // device context for painting
					   // TODO: ここにメッセージ ハンドラー コードを追加します。
					   // 描画メッセージで CFrameWnd::OnPaint() を呼び出さないでください。
	CDC bmpDC;
	CBitmap* cbmp;
 
	cbmp = CBitmap::FromHandle(m_image);
	if (cbmp == NULL)
		return;
	bmpDC.CreateCompatibleDC(&dc);
	CBitmap* oldbmp = bmpDC.SelectObject(cbmp);
	dc.SetStretchBltMode(STRETCH_HALFTONE);
	dc.SetBrushOrg(0, 0);
	dc.StretchBlt(0, 0, 1024, 768, &bmpDC, 0, 0, m_image.GetWidth(), m_image.GetHeight(), SRCCOPY);
	bmpDC.SelectObject(oldbmp);
	cbmp->DeleteObject();
	bmpDC.DeleteDC();
}
 
void CMyWindow::OnDropFiles(HDROP hDropInfo)
{
	UINT length = DragQueryFile(hDropInfo, 0, NULL, 0);
	CString csfile;
	DragQueryFile(hDropInfo, 0, csfile.GetBuffer(length + 1), length + 1);
	csfile.ReleaseBuffer();
 
	LoadImage(csfile);
	InvalidateRect(NULL, false);
}
 
// 画像を読み込む
bool CMyWindow::LoadImage(CString filename)
{
	m_image.Destroy();
	m_image.Load(filename);
	return m_image.IsNull() ? true : false;
}

prog.cpp:2:1: error: expected class-name before ‘{’ token
 {
 ^
prog.cpp:6:22: error: ISO C++ forbids declaration of ‘DECLARE_MESSAGE_MAP’ with no type [-fpermissive]
  DECLARE_MESSAGE_MAP()
                      ^
prog.cpp:6:22: error: expected ‘;’ at end of member declaration
  DECLARE_MESSAGE_MAP()
                      ^
                       ;
prog.cpp:7:2: error: ‘afx_msg’ does not name a type
  afx_msg void OnEnd();
  ^~~~~~~
prog.cpp:8:2: error: ‘afx_msg’ does not name a type
  afx_msg void OnAbout();
  ^~~~~~~
prog.cpp:9:2: error: ‘afx_msg’ does not name a type
  afx_msg void OnPaint();
  ^~~~~~~
prog.cpp:10:2: error: ‘afx_msg’ does not name a type
  afx_msg void OnDropFiles(HDROP hDropInfo);
  ^~~~~~~
prog.cpp:11:2: error: ‘afx_msg’ does not name a type
  afx_msg void OnFileOpen();
  ^~~~~~~
prog.cpp:13:2: error: ‘CImage’ does not name a type
  CImage m_image;
  ^~~~~~
prog.cpp:15:17: error: ‘CString’ has not been declared
  bool LoadImage(CString filename);
                 ^~~~~~~
prog.cpp:18:6: error: no declaration matches ‘void CMyWindow::OnPaint()’
 void CMyWindow::OnPaint()
      ^~~~~~~~~
prog.cpp:18:6: note: no functions named ‘void CMyWindow::OnPaint()’
prog.cpp:1:7: note: ‘class CMyWindow’ defined here
 class CMyWindow : public CFrameWnd
       ^~~~~~~~~
prog.cpp:39:29: error: variable or field ‘OnDropFiles’ declared void
 void CMyWindow::OnDropFiles(HDROP hDropInfo)
                             ^~~~~
prog.cpp:39:29: error: ‘HDROP’ was not declared in this scope
prog.cpp:51:27: error: ‘bool CMyWindow::LoadImage’ is not a static data member of ‘class CMyWindow’
 bool CMyWindow::LoadImage(CString filename)
                           ^~~~~~~
prog.cpp:51:27: error: ‘CString’ was not declared in this scope

Standard output is empty