c与cpp,在编译上有区别吗?深入浅出MFC上的实例generic.c为何改成cpp无法编译呢?

Question

c与cpp,在编译上有区别吗?深入浅出MFC上的实例generic.c为何改成cpp无法编译呢?
我刚学习 "深入浅出 MFC",刚才练习整本书中的第一个示例,就是窗口的注册与创建.
书上的源码 generic.c 的后缀是 c,但是我用 vc6 建的工程,自动把后缀保存成 generic.cpp了.
最后就是无法通过编译.最好我将 generic.cpp 改成 generic.c ,就通过编译了.
运行正常,窗口产生了.我不解.
1.c 和 cpp,在编译上有区别吗?2.vc6建工程,如何创建后缀是 C 的源文件呢?好像只要新写的代码,保存时就存成 .cpp 了.除非加入一个 C 后缀的文件.3.深入浅出的第一个示例,用vc6来练习的话,要建立什么工程呀?
 好像不管什么工程,源文件,都自动保存成 CPP 呀.

Answer 1

VC6啊，太久远了，记不清了，把代码贴出来看看吧。默认源文件名就是cpp吧，既然叫VC++6.0，当然不会默认是.c了，文件名可以自己指定的，不过编译都是C++的编译器就是了。

Answer 2

generic.c#include <windows.h>
#include "resource.h"
#include "generic.h"HINSTANCE _hInst;
HWND _hWnd;char _szAppName[]="Generic";
char _szTitle[]="Generic Sample Sample Application";int CALLBACK WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,
 LPSTR lpCmdLine,int nCmdShow)
{
MSG msg;
UNREFERENCED_PARAMETER(lpCmdLine);
if (!hPrevInstance)
if (!InitApplication(hInstance))
return (FALSE);
if (!InitInstance(hInstance,nCmdShow))
return (FALSE); while (GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
} return (msg.wParam);
}BOOL InitApplication(HINSTANCE hInstance)
{
WNDCLASS  wc;  wc.style         = CS_HREDRAW | CS_VREDRAW;
  wc.lpfnWndProc   = (WNDPROC)WndProc;     
  wc.cbClsExtra    = 0;
  wc.cbWndExtra    = 0;
  wc.hInstance     = hInstance;
  wc.hIcon         = LoadIcon(hInstance, "jjhouricon");
  wc.hCursor       = LoadCursor(NULL, IDC_ARROW);
  wc.hbrBackground = GetStockObject(WHITE_BRUSH);  
  wc.lpszMenuName  = "GenericMenu";               
  wc.lpszClassName = _szAppName;  return (RegisterClass(&wc));
}
BOOL InitInstance(HINSTANCE hInstance,int nCmdShow)
{ //_hInst=hInstabce;
_hInst = hInstance; 
_hWnd=CreateWindow(
_szAppName,
_szTitle,
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL
);
if (!_hWnd)
return (FALSE); ShowWindow(_hWnd,nCmdShow);
UpdateWindow(_hWnd);
return (TRUE);
}LRESULT CALLBACK WndProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam)
{
int wmId,wmEvent;
switch (message)
{
case WM_COMMAND:
wmId=LOWORD(wParam);
wmEvent=HIWORD(wParam); switch (wmId)
{
case IDM_ABOUT:
DialogBox(_hInst,
"AboutBox",
hWnd,
(DLGPROC)About
);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
default:
return(DefWindowProc(hWnd,message,wParam,lParam));
} break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return (DefWindowProc(hWnd,message,wParam,lParam));
}
return (0);
}LRESULT CALLBACK About(HWND hDlg,UINT message,WPARAM wParam,LPARAM lParam)
{
UNREFERENCED_PARAMETER(lParam);
switch (message)
{
case WM_INITDIALOG:
return (TRUE);
case WM_COMMAND:
if (LOWORD(wParam)==IDOK || LOWORD(wParam)==IDCANCEL)
{
EndDialog(hDlg,TRUE);
return(TRUE);
}
break;
}
return (FALSE);
}

Answer 3

generic.hBOOL InitApplication(HANDLE);
BOOL InitInstance(HANDLE,int);
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
LRESULT CALLBACK About(HWND,UINT,WPARAM,LPARAM);
resource.h//---------------------------------------------------------------------
//        resource.h
//---------------------------------------------------------------------
#define IDM_NEW                         40001
#define IDM_OPEN                        40002
#define IDM_SAVE                        40003
#define IDM_SAVEAS                      40004
#define IDM_PRINT                       40005
#define IDM_PRINTSETUP                  40006
#define IDM_EXIT                        40007
#define IDM_UNDO                        40008
#define IDM_CUT                         40009
#define IDM_COPY                        40010
#define IDM_PASTE                       40011
#define IDM_LINK                        40012
#define IDM_LINKS                       40013
#define IDM_HELPCONTENTS                40014
#define IDM_HELPSEARCH                  40015
#define IDM_HELPHELP                    40016
#define IDM_ABOUT                       40017

Answer 4

注:其中第一个 generic.c 如果文件是 generic.cpp ,就不能通过编译.对个,还有 RC 文件://---------------------------------------------------------------------
//   generic.rc
//---------------------------------------------------------------------
#include "windows.h"
#include "resource.h"jjhouricon ICON    DISCARDABLE     "jjhour.ico"GenericMenu MENU DISCARDABLE
BEGIN
    POPUP "&File"
    BEGIN
        MENUITEM "&New",              IDM_NEW, GRAYED
        MENUITEM "&Open...",          IDM_OPEN, GRAYED
        MENUITEM "&Save",             IDM_SAVE, GRAYED
        MENUITEM "Save &As...",       IDM_SAVEAS, GRAYED
        MENUITEM SEPARATOR
        MENUITEM "&Print...",         IDM_PRINT, GRAYED
        MENUITEM "P&rint Setup...",   IDM_PRINTSETUP, GRAYED
        MENUITEM SEPARATOR
        MENUITEM "E&xit",             IDM_EXIT
    END
    POPUP "&Edit"
    BEGIN
        MENUITEM "&Undo\tCtrl+Z",     IDM_UNDO, GRAYED
        MENUITEM SEPARATOR
        MENUITEM "Cu&t\tCtrl+X",      IDM_CUT, GRAYED
        MENUITEM "&Copy\tCtrl+C",     IDM_COPY, GRAYED
        MENUITEM "&Paste\tCtrl+V",    IDM_PASTE, GRAYED
        MENUITEM "Paste &Link",       IDM_LINK, GRAYED
        MENUITEM SEPARATOR
        MENUITEM "Lin&ks...",         IDM_LINKS, GRAYED
    END
    POPUP "&Help"
    BEGIN
        MENUITEM "&Contents",               IDM_HELPCONTENTS, GRAYED
        MENUITEM "&Search for Help On...",  IDM_HELPSEARCH, GRAYED
        MENUITEM "&How to Use Help",        IDM_HELPHELP, GRAYED
        MENUITEM SEPARATOR
        MENUITEM "&About Generic...",       IDM_ABOUT
    END
ENDAboutBox DIALOG DISCARDABLE  22, 17, 144, 75
STYLE DS_MODALFRAME | WS_CAPTION | WS_SYSMENU
CAPTION "About Generic"
BEGIN
    CTEXT           "Windows 95",         -1,0, 5,144,8
    CTEXT           "Generic Application",-1,0,14,144,8
    CTEXT           "Version 1.0",        -1,0,34,144,8
    DEFPUSHBUTTON   "OK",              IDOK,53,59,32,14,WS_GROUP
END

Answer 5

CALLBACK 是 __stdcall，标准C不支持。所以VC已经把这段代码按照C++编译了。

Answer 6

你说反了吧,是 cpp 无法通过编译, c 扩展名可以通过编译呀.