运行结果迟迟不出

Question

#include <iostream>
#include <fstream>
#include <windows.h>
#include "resource.h"
#include <string.h>
using namespace std;LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
OPENFILENAME ofn;//定义变量
TCHAR szFile[100]=TEXT("");//准备用来存放文件的缓冲区
static TCHAR szAppName[] = TEXT ("Graphic") ;int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
     HWND         hwnd ;
     MSG          msg ;
     WNDCLASS     wndclass ;
     HACCEL       hAccel ;
     
     wndclass.style         = CS_HREDRAW | CS_VREDRAW ;
     wndclass.lpfnWndProc   = WndProc ;
     wndclass.cbClsExtra    = 0 ;
     wndclass.cbWndExtra    = 0 ;
     wndclass.hInstance     = hInstance ;
     wndclass.hIcon         = LoadIcon (hInstance, MAKEINTRESOURCE(IDI_ICON1)) ;
     wndclass.hCursor       = LoadCursor (hInstance,MAKEINTRESOURCE(IDC_CURSOR1)) ;
     wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
     wndclass.lpszMenuName  = MAKEINTRESOURCE(IDR_MENU1) ;
     wndclass.lpszClassName = szAppName ;
     
     if (!RegisterClass (&wndclass))
     {
          MessageBox (NULL, TEXT ("This program requires Windows NT!"), 
                      szAppName, MB_ICONERROR) ;
          return 0 ;
     }
     
     hwnd = CreateWindow (szAppName, TEXT ("The fifth assignment"),
                          WS_OVERLAPPEDWINDOW|WS_VSCROLL,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          CW_USEDEFAULT, CW_USEDEFAULT,
                          NULL, NULL, hInstance, NULL) ;  iCmdShow=SW_SHOWMAXIMIZED;
     ShowWindow (hwnd, iCmdShow) ;
     UpdateWindow (hwnd) ;
     
 hAccel = LoadAccelerators (hInstance,MAKEINTRESOURCE(IDR_ACCELERATOR1)) ;     while (GetMessage (&msg, NULL, 0, 0))
     {
          if (!TranslateAccelerator (hwnd, hAccel, &msg))
 {
  TranslateMessage (&msg) ;
                  DispatchMessage (&msg) ;
  }
     }
     return (int)msg.wParam ;
}class Graphic
{
public:
int i;//i indicate 1.Bezier 2.Ellipse 3.Rectangle
POINT  point[4];
public:
Graphic(int ii,POINT ppoint[])
{
i=ii;
for(int j=0;j<=3;j++)
point[j]=ppoint[j];
}
Graphic()
{
i=0;
}
};class GraphicStack
{
public:
Graphic stack[100];
int i;//i指向栈顶位置
public:
GraphicStack()
{
i=0;
} void pushback(Graphic iup)
{
stack[i].i=iup.i;
for(int j=0;j<=3;j++)
stack[i].point[j]=iup.point[j];
i++;
}
void clear()
{
i=0;
}
};int Open_Item(HWND hwnd)
{
//initialize openfilename
ZeroMemory(&ofn,sizeof(OPENFILENAME));//整个数据结构的所有信息置0
ofn.lStructSize=sizeof(OPENFILENAME);
ofn.hwndOwner=hwnd;
ofn.lpstrFile=szFile;
ofn.nMaxFile=sizeof(szFile);
ofn.lpstrFilter=TEXT("All Files(*.*)\0*.*\0Text Files(*.txt)\0*.TXT\0C++ Files(*.cpp)\0*.cpp\0C++ hFiles(*.h)\0*.h\0");//自定义筛选器
ofn.nFilterIndex=1;//default the number of the filter
ofn.lpstrFileTitle=NULL;
ofn.nMaxFileTitle=0;//Specifies the size, in TCHARs, of the buffer pointed to by lpstrFileTitle. For the ANSI version, this is the number of bytes; for the Unicode version, this is the number of characters. This member is ignored if lpstrFileTitle is NULL
ofn.lpstrInitialDir=NULL;//Pointer to a NULL terminated string that can specify the initial directory. The algorithm for selecting the initial directory varies on different platforms. 
ofn.Flags=OFN_HIDEREADONLY|OFN_CREATEPROMPT;

//DISPLAY THE OPEN DIALOG
return GetOpenFileName(&ofn);
}int Save_Item(HWND hwnd)
{
//initialize openfilename
ZeroMemory(&ofn,sizeof(OPENFILENAME));//整个数据结构的所有信息置0
ofn.lStructSize=sizeof(OPENFILENAME);
ofn.hwndOwner=hwnd;
ofn.lpstrFile=szFile;
ofn.nMaxFile=sizeof(szFile);
ofn.lpstrFilter=TEXT("Text Files(*.txt)\0*.TXT\0C++ Files(*.cpp)\0*.cpp\0C++ hFiles(*.h)\0*.h\0");//自定义筛选器
ofn.nFilterIndex=1;//default the number of the filter
ofn.lpstrFileTitle=NULL;
ofn.nMaxFileTitle=0;//Specifies the size, in TCHARs, of the buffer pointed to by lpstrFileTitle. For the ANSI version, this is the number of bytes; for the Unicode version, this is the number of characters. This member is ignored if lpstrFileTitle is NULL
ofn.lpstrInitialDir=NULL;//Pointer to a NULL terminated string that can specify the initial directory. The algorithm for selecting the initial directory varies on different platforms. 
ofn.Flags=OFN_HIDEREADONLY|OFN_CREATEPROMPT; //DISPLAY THE OPEN DIALOG
return GetSaveFileName(&ofn);
}

Answer 1

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
 static HINSTANCE hInstance;
     static GraphicStack stack;
 static POINT point[4];
 static int nState=0;
 static BOOL fErase=FALSE;
 static RECT rect;
     static int nGraph=ID_BEZIER;
     int xPos,yPos;
 HDC hdc;
 POINT dot;
 PAINTSTRUCT ps;
     TCHAR str[50];//wchar_t str[50];// char str[50];
 static int k;  static HMENU   hMenu ;
     static HANDLE hFile;  switch (message)
     {
     case WM_CREATE:
  GetClientRect(hwnd,&rect);
  CheckMenuRadioItem(GetMenu(hwnd),ID_BEZIER,ID_ELLIPSE,ID_RECTANGLE,MF_BYCOMMAND);
  return 0;
                                                      
     case WM_SIZE:
          InvalidateRect (hwnd, NULL, TRUE) ;
  nState=0;
          return 0 ;     case WM_PAINT:
hdc=BeginPaint(hwnd,&ps); FillRect(hdc,&rect,WHITE_BRUSH); for(k=0;k<stack.i;k++)
if(stack.stack[k].i==1)
PolyBezier(hdc,stack.stack[k].point,4); else if(stack.stack[k].i==2)
{
//SelectObject(hdc,GetStockObject(NULL_BRUSH));
Ellipse(hdc,stack.stack[k].point[0].x,stack.stack[k].point[0].y,stack.stack[k].point[1].x,stack.stack[k].point[1].y);
//SelectObject(hdc,GetStockObject(WHITE_BRUSH));
}
else if(stack.stack[k].i==3)
{
//SelectObject(hdc,GetStockObject(NULL_BRUSH));
Polygon(hdc,stack.stack[k].point,4);
//SelectObject(hdc,GetStockObject(WHITE_BRUSH));
}
EndPaint(hwnd,&ps);
nState=0;
return 0;     case WM_LBUTTONDOWN://客户区鼠标消息
          GetCursorPos(&dot);
  ScreenToClient(hwnd,&dot);
    xPos=dot.x;   
  yPos=dot.y;
          SetCapture(hwnd);
          hdc=GetDC(hwnd);
          SetROP2(hdc,R2_NOTXORPEN);
 
  switch(nGraph)
         {
  case ID_BEZIER:
          switch (nState)
  {
            case 0: 
              point[0].x=xPos; 
  point[0].y=yPos;
              nState=1;
              break;
            case 2:
              MoveToEx(hdc,point[0].x,point[0].y,NULL);
              LineTo(hdc,point[3].x,point[3].y);
              point[1].x=xPos;   point[1].y=yPos;
              point[2].x=xPos;   point[2].y=yPos;
              PolyBezier(hdc,point,4);
              nState=3;
              fErase=TRUE;
              break;
            case 4: 
              PolyBezier(hdc,point,4);
              point[2].x=xPos;   point[2].y=yPos;
              PolyBezier(hdc,point,4);
              nState=5;
              fErase=TRUE;
              break;
           }
          break;   case ID_ELLIPSE:
            point[0].x=xPos;
point[0].y=yPos;
point[1].x=xPos;
point[1].y=yPos;
fErase=TRUE;
break;
  
  case ID_RECTANGLE:
             switch(nState)
 {
 case 0:
 point[0].x=point[1].x=xPos;
 point[0].y=point[1].y=yPos;
 nState=1;
 fErase=TRUE;
  break;
 }
  }
          ReleaseDC(hwnd,hdc);
          break;
  InvalidateRect(hwnd,NULL,TRUE);
          return 0 ;

Answer 2

case WM_LBUTTONUP:
  GetCursorPos(&dot);
          ScreenToClient(hwnd,&dot);
  xPos=dot.x; 
  yPos=dot.y;  switch(nGraph)
 {
 case ID_BEZIER:
 fErase=FALSE;
 switch(nState)
 {
 case 1:
 point[3].x=xPos;    point[3].y=yPos;
             nState=2;
break; case 3:
point[1].x=xPos;   point[1].y=yPos;
nState=4;
break; case 5: 
point[2].x=xPos;   point[2].y=yPos;
nState=0;
stack.pushback(Graphic(1,point));//
        break;
}
break;  case ID_ELLIPSE:
 stack.pushback(Graphic(2,point));//
             
 case ID_RECTANGLE:
  switch(nState)
  {
  case 1:
  point[1].x=point[2].x=xPos;
  point[1].y=point[2].y=yPos;
  nState=2;
  break;
  case 2:
  point[2].x=point[3].x=xPos;
  point[2].y=point[3].y=yPos;
  nState=3;
  break;
  case 3:
  point[3].x=xPos;
  point[3].y=yPos;
  nState=4;
  fErase=FALSE;
  break;
  }
  break;
  }
          ReleaseCapture();
          break;
  return 0;
 
     case WM_MOUSEMOVE:
          GetCursorPos(&dot);
  ScreenToClient(hwnd,&dot);
  xPos=dot.x; 
  yPos=dot.y;
          
  hdc=GetDC(hwnd);
          SetROP2(hdc,R2_NOTXORPEN);
          
  switch(nGraph)
  {
          case ID_BEZIER:
    if(wParam&MK_LBUTTON){
              switch (nState){
                case 1: 
                    if(fErase){
                        MoveToEx(hdc,point[0].x,point[0].y,NULL);
                        LineTo(hdc,point[3].x,point[3].y);
                    }
                    point[3].x=xPos;    point[3].y=yPos;
                    MoveToEx(hdc,point[0].x,point[0].y,NULL);
                    LineTo(hdc,point[3].x,point[3].y);
                  break;
                case 3:
                    if(fErase)  PolyBezier(hdc,point,4);
                    point[1].x=xPos;     point[1].y=yPos;
                    point[2].x=xPos;     point[2].y=yPos;
                    PolyBezier(hdc,point,4);
                    break;
                case 5: 
                    if(fErase)  PolyBezier(hdc,point,4);
                    point[2].x=xPos;     point[2].y=yPos;
                    PolyBezier(hdc,point,4);
                    break;
              }
  fErase=TRUE;
}      case ID_ELLIPSE:
           if(wParam&MK_LBUTTON)
 {
 SetROP2(hdc,R2_NOTXORPEN);
  if(fErase)
Ellipse(hdc,point[0].x,point[0].y,point[1].x,point[1].y);
  point[1].x=xPos;
  point[1].y=yPos;
  Ellipse(hdc,point[0].x,point[0].y,point[1].x,point[1].y);
 }      case ID_RECTANGLE:
            if(wParam&MK_LBUTTON){
SetROP2(hdc,R2_NOTXORPEN);
  switch(nState)
  {
  case 1:
MoveToEx(hdc,point[0].x,point[0].y,NULL);
LineTo(hdc,point[1].x,point[1].y);
    point[1].x=xPos;
point[1].y=yPos;
MoveToEx(hdc,point[0].x,point[0].y,NULL);
LineTo(hdc,point[1].x,point[1].y);
break;
  case 2:
MoveToEx(hdc,point[1].x,point[1].y,NULL);
LineTo(hdc,point[2].x,point[2].y);
point[2].x=xPos;
point[2].y=yPos;
MoveToEx(hdc,point[1].x,point[1].y,NULL);
LineTo(hdc,point[2].x,point[2].y);
break;
  case 3:
MoveToEx(hdc,point[2].x,point[2].y,NULL);
LineTo(hdc,point[3].x,point[3].y);
point[3].x=xPos;
point[3].y=yPos;
MoveToEx(hdc,point[2].x,point[2].y,NULL);
LineTo(hdc,point[3].x,point[3].y);
break;
  }
  break;
 }
  }
             ReleaseDC(hwnd,hdc);
             return 0;  case WM_COMMAND:
 hMenu = GetMenu (hwnd) ;
          switch (LOWORD (wParam))
          {  
 case ID_NEW:
 stack.clear();
InvalidateRect(hwnd,NULL,TRUE);

return 0;
     case ID_LOAD:
if(Open_Item(hwnd))
{
ifstream fin(szFile,ios::binary);
fin.read((char *)(&stack), sizeof(stack));
fin.close();
InvalidateRect(hwnd,NULL,TRUE);
}
return 0;  case ID_SAVE:
if(Save_Item(hwnd)>0)
{
ofstream fout(szFile, ios::binary);
fout.write((char *)(&stack), sizeof(stack));
fout.close();
}
return 0;  case ID_EXIT:
  SendMessage (hwnd, WM_CLOSE, 0, 0) ;
               return 0 ;     case ID_ABOUT_INFORMATION:
 LoadString(hInstance,IDS_STRINGINFO,str,lstrlen(str));
 MessageBox(hwnd,str,szAppName,MB_OK | MB_ICONINFORMATION) ;
               return 0 ;

     case ID_BEZIER:
     case ID_ELLIPSE:
     case ID_RECTANGLE:
           if(nGraph==ID_RECTANGLE&&nState==4&&LOWORD(wParam)==ID_RECTANGLE)
{
stack.pushback(Graphic(3,point));
InvalidateRect(hwnd,NULL,TRUE);
}
CheckMenuRadioItem(GetMenu(hwnd),ID_BEZIER,ID_RECTANGLE,LOWORD(wParam),MF_BYCOMMAND);
nGraph=LOWORD(wParam);
nState=0;
InvalidateRect(hwnd,NULL,TRUE);
return 0;     case WM_DESTROY:
  PostQuitMessage (0) ;
          return 0 ;
     }
     return DefWindowProc (hwnd, message, wParam, lParam) ;
}
}

Answer 3

还在整理代码，真是强大的代码^^，有空的话，不妨整理一下，把WndProc函数里面的switch们放到一个个函数里面去，看起来会轻松很多。
然后把WndProc里面的那些static变量放到程序的最开始作为全局变量而存在之类的。

Answer 4

恩好~谢谢  哈哈还从没想到过要把WndProc函数里面的switch们放到一个个函数里面去，急着交作业但一直搞不好~

Answer 5

帮lz转到技术区，另外，lz别忘及时揭帖