本人刚学vc++,按书上讲的创建一个最简单的窗口实例,但却遇到一个错误,请深山老鸟帮我上机试试.
window.cpp如下:
#include<windows.h>
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
//--------------初始化窗口类------------------
int WINAPI WinMain( HINSTANCE hInstance,
HINSTANCE hPrevInst,
LPSTR lpszCmdLine,
int nCmdShow)
{
HWND hwnd;
MSG Msg;
WNDCLASS wndclass;
char lpszClassName[]="窗口";
char lpszTitle[]="My_windows";
wndclass.style=0;
wndclass.lpfnWndProc=WndProc;
wndclass.cbClsExtra=0;
wndclass.cbWndExtra=0;
wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
wndclass.hbrBackground=GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName=NULL;
wndclass.lpszClassName=lpszClassName;
//-----------------以下进行窗口类的注册--------------
if(!RegisterClass(&wndclass))
{
MessageBeep(0);
return FALSE;
}
hwnd=CreateWindow(lpszClassName,
lpszTitle,
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL);
ShowWindow(hwnd,nCmdShow);
UpdateWindow(hwnd);
while(GetMessage(&Msg,NULL,0,0))
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return Msg.wParam;
}
LRESULT CALLBACK WndProc( HWND hwnd,
UINT message,
WPARAM wParam,
LPARAM lParam)
{
switch(message)
{
case WM_DESTROY:
PostQuitMessage(0);
default:
return DefWindowProc(hwnd,message,wParam,lParam);
}
return(0);
}
在vc6.0上编译的错误为:
ompiling...
窗口.cpp
D:\bake\c++语言程序设计习题与实验指导\《C++语言程序设计(第2版)》例题程序\ch09code\窗口.cpp(20) : error C2440: '=' : cannot convert from 'void *' to 'struct HBRUSH__ *'
Conversion from 'void*' to pointer to non-'void' requires an explicit cast
Error executing cl.exe.
window.cpp如下:
#include<windows.h>
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
//--------------初始化窗口类------------------
int WINAPI WinMain( HINSTANCE hInstance,
HINSTANCE hPrevInst,
LPSTR lpszCmdLine,
int nCmdShow)
{
HWND hwnd;
MSG Msg;
WNDCLASS wndclass;
char lpszClassName[]="窗口";
char lpszTitle[]="My_windows";
wndclass.style=0;
wndclass.lpfnWndProc=WndProc;
wndclass.cbClsExtra=0;
wndclass.cbWndExtra=0;
wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
wndclass.hbrBackground=GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName=NULL;
wndclass.lpszClassName=lpszClassName;
//-----------------以下进行窗口类的注册--------------
if(!RegisterClass(&wndclass))
{
MessageBeep(0);
return FALSE;
}
hwnd=CreateWindow(lpszClassName,
lpszTitle,
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL);
ShowWindow(hwnd,nCmdShow);
UpdateWindow(hwnd);
while(GetMessage(&Msg,NULL,0,0))
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return Msg.wParam;
}
LRESULT CALLBACK WndProc( HWND hwnd,
UINT message,
WPARAM wParam,
LPARAM lParam)
{
switch(message)
{
case WM_DESTROY:
PostQuitMessage(0);
default:
return DefWindowProc(hwnd,message,wParam,lParam);
}
return(0);
}
在vc6.0上编译的错误为:
ompiling...
窗口.cpp
D:\bake\c++语言程序设计习题与实验指导\《C++语言程序设计(第2版)》例题程序\ch09code\窗口.cpp(20) : error C2440: '=' : cannot convert from 'void *' to 'struct HBRUSH__ *'
Conversion from 'void*' to pointer to non-'void' requires an explicit cast
Error executing cl.exe.
这句改成:
wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
现在的问题是:
ation: 窗口 - Win32 Debug--------------------
Compiling...
窗口.cpp
Linking...
LIBCD.lib(crt0.obj) : error LNK2001: unresolved external symbol _main
Debug/窗口.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
顺便说一下,我的编译方法和变通的c++习题的编译方法一样的。是这样编译的吗?还是要生成什么项目的?
------------->
wndclass.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
Project->Settings->到Link那个Tab上->下方的Project Options:中找到/subsystem:console,改成/subsystem:windows
Linking...
LINK : fatal error LNK1168: cannot open Debug/窗口.exe for writing
Error executing link.exe.窗口.exe - 1 error(s), 0 warning(s)
好心的朋友,再帮我看看吧:)
估计你选了win32 console application的模式,这样:
Project->Settings->到Link那个Tab上->下方的Project Options:中找到/subsystem:console,改成/subsystem:windows
-
-
如果不选win32 console application模式,应该选什么模式呢?我再试着按你说的步骤重新来一遍,程序应该没问题吧,因为我compiled successful.