Question

LRESULT CALLBACK WndProc(HWND, UINT,WPARAM,LPARAM);

#include <windows.h>
#include "stdafx.h"
LRESULT CALLBACK WndProc(HWND, UINT,WPARAM,LPARAM);
int APIENTRY WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
WNDCLASS wndclass;
HWND hwnd;
MSG msg;
wndclass.style = CS_HREDRAW|CS_VREDRAW;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(NULL,IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL,IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = "windows 创建窗口！";
if(!RegisterClass(&wndclass)) return FALSE;
hwnd=CreateWindow("windows 创建窗口！","windows 创建窗口",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 45 lParam)
{
switch(message)
{
case WM_PAINT:
HDC hdc;
PAINTSTRUCT ps;
hdc = BeginPaint(hwnd,&ps);
TextOut(hdc,10,20,"哈哈，windows 编程创建的窗口！", 28);
EndPaint(hdc,&ps);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd,message,wParam,lParam);
}

编译出错：
1.windemo\windemo.cpp(45) : error C2143: syntax error : missing ')' before 'constant'
2.error C2143: syntax error : missing ';' before 'constant'
3.fatal error C1004: unexpected end of file found

请帮我找下错误，
调试了几次都不对，尤其第三个错误，头文件我也包含进来了

Answer 1

#include <windows.h>
#include "stdafx.h"
LRESULT CALLBACK WndProc(HWND, UINT,WPARAM,LPARAM);
int APIENTRY WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
WNDCLASS wndclass;
HWND hwnd;
MSG msg;
wndclass.style = CS_HREDRAW|CS_VREDRAW;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(NULL,IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL,IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = "windows 创建窗口！";
if(!RegisterClass(&wndclass)) return FALSE;
hwnd=CreateWindow("windows 创建窗口！","windows 创建窗口",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_PAINT:
HDC hdc;
PAINTSTRUCT ps;
hdc = BeginPaint(hwnd,&ps);
TextOut(hdc,10,20,"哈哈，windows 编程创建的窗口！",28);
EndPaint(hwnd,&ps);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hwnd,message,wParam,lParam);
}

Answer 2

两个错误。
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
//哪里跑出来个45？
EndPaint(hwnd,&ps);//要用窗口句柄

追问

编译仍是这三个问题，还有我是初学MFC ，45我也不明白什么意思，照教材上敲的，不过去掉45 编译又出新错。能说说第三个错误“fatal error C1004: unexpected end of file found ” 问题出在哪里吗

追答

我这不出问题了，编译通过。
那三个错误就是45造成的，整个代码逻辑上，这里多出东西，就匹配不上了。

追问

谢谢，把45去掉好了，没错了，就是没明白45干嘛用的

追答

我估计。。。书上的页码？哈哈
这个肯定是没有的。

Answer 3

你双击
windemo\windemo.cpp(45) : error C2143: syntax error : missing ')' before 'constant'
这一行，再把问题所在的代码贴出来

追问

LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM 45 lParam)
去掉45可以通过了，谢谢