我做写了段代码,为什么会出现这样的现象?

Question

#include<windows.h>
#include<stdio.h>LRESULT CALLBACK WinSunProc(
HWND hwnd,
UINT uMsg,
WPARAM wParam,
LPARAM lParam
);
int WINAPI WinMain(
HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow
)
//设计一个窗口类
{
WNDCLASS wndcls;
wndcls.cbClsExtra=0;
wndcls.cbWndExtra=0;
wndcls.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);
wndcls.hCursor=LoadCursor(NULL,IDC_CROSS);
wndcls.hIcon=LoadIcon(NULL,IDI_ERROR);
wndcls.hInstance=hInstance;
wndcls.lpfnWndProc=WinSunProc;
wndcls.lpszClassName="wzy";
wndcls.lpszMenuName=NULL;
wndcls.style=CS_HREDRAW|CS_VREDRAW;
RegisterClass(&wndcls); //创建窗口，定义一个变量用来保存成功创建窗口后返回的句柄
HWND hwnd;
hwnd=CreateWindow("wzy","王振宇",WS_OVERLAPPEDWINDOW,0,0,666,666,NULL,NULL,hInstance,NULL);
//显示及刷新窗口
ShowWindow(hwnd,SW_SHOWNORMAL);
UpdateWindow(hwnd);
//定义消息机构体，开始消息循环
MSG msg;
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
} return msg.wParam;}//编写窗口过程函数
LRESULT CALLBACK WinSunProc(
HWND hwnd,
UINT uMsg,
WPARAM wParam,
LPARAM lParam
)
{
switch(uMsg)
{
case WM_CHAR:
char szChar[20];
sprintf(szChar,"您输入的字符是 %d",wParam);
MessageBox(hwnd ,szChar,"char",0);
break;
case WM_LBUTTONDOWN:
MessageBox(hwnd,"mouse clicked","message",0);
HDC hdc;//不能在响应WM_PAINT消息时调用
TextOut(hdc,33,33,"王振宇",strlen("王振宇"));
break;
case WM_PAINT:
HDC hDC;
PAINTSTRUCT ps;
hDC=BeginPaint(hwnd,&ps);//BeginPaint只能在响应WM_PAINT消息时调用
TextOut(hDC,0,0,"ASDFJKL;ASJFKLD;AS",strlen("ASDFJKL;ASJFKLD;AS"));
EndPaint(hwnd,&ps);
break;
case WM_CLOSE:
if (IDYES==MessageBox(hwnd,"是否真的要结束程序?","警告消息",MB_YESNO))
{
DestroyWindow(hwnd);
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd,uMsg,wParam,lParam);
}
return 0;
}

Answer 1

我运行了上面的，但还是出现那个错误,那个错误说的到底是什么意思呀?我现在初学MFC,希望大家传授一些学MFC的方法和心得,我感觉MFC好难,请问你们在初学的时候也感觉难吗?那你们是怎么学会的呢?

Answer 2

你工程是怎么建的不要完全相信编译器的报错信息我这里编译是OK的我现在初学MFC-----你上面是直接用的SDK
呵呵，我也接触不久，不过我直接用MFC的，回头再看看SDK编程万事都没捷径的，多看多写

Answer 3

楼上的有QQ或MSN吗?我加你问你些问题?我有好多不懂,比如你是怎么看出来是用MFC还是SDK的,那程序是我根据别人的代码改的.

Answer 4

我觉得有什么问题还是自己先尝试解决吧不能想都不想一下就发问当然，如果真有不能解决的，可以一起讨论呵呵，baidu，google就是最好的老师

Answer 5

#include<windows.h>
#include<stdio.h>LRESULT CALLBACK WinSunProc(
HWND hwnd,
UINT uMsg,
WPARAM wParam,
LPARAM lParam
);
int WINAPI WinMain(
HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow
)
//设计一个窗口类
{
WNDCLASS wndcls;
wndcls.cbClsExtra=0;
wndcls.cbWndExtra=0;
wndcls.hbrBackground=(HBRUSH)GetStockObject(BLACK_BRUSH);
wndcls.hCursor=LoadCursor(NULL,IDC_CROSS);
wndcls.hIcon=LoadIcon(NULL,IDI_ERROR);
wndcls.hInstance=hInstance;
wndcls.lpfnWndProc=WinSunProc;
wndcls.lpszClassName="wzy";
wndcls.lpszMenuName=NULL;
wndcls.style=CS_HREDRAW|CS_VREDRAW;
RegisterClass(&wndcls);//创建窗口，定义一个变量用来保存成功创建窗口后返回的句柄
HWND hwnd;
hwnd=CreateWindow("wzy","王振宇",WS_OVERLAPPEDWINDOW,0,0,666,666,NULL,NULL,hInstance,NULL);
//显示及刷新窗口
ShowWindow(hwnd,SW_SHOWNORMAL);
UpdateWindow(hwnd);
//定义消息机构体，开始消息循环
MSG msg;
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}return msg.wParam;}//编写窗口过程函数
LRESULT CALLBACK WinSunProc(
HWND hwnd,
UINT uMsg,
WPARAM wParam,
LPARAM lParam
)
{
char szChar[20];
HDC hDC;//不能在响应WM_PAINT消息时调用
switch(uMsg)
{
case WM_CHAR:
sprintf(szChar,"您输入的字符是 %d",wParam);
MessageBox(hwnd ,szChar,"char",0);
break;
case WM_LBUTTONDOWN:
MessageBox(hwnd,"mouse clicked","message",0);
hDC=GetWindowDC(hwnd);
TextOut(hDC,33,33,"王振宇",strlen("王振宇"));
break;
case WM_PAINT:
PAINTSTRUCT ps;
hDC=BeginPaint(hwnd,&ps);//BeginPaint只能在响应WM_PAINT消息时调用
TextOut(hDC,0,0,"ASDFJKL;ASJFKLD;AS",strlen("ASDFJKL;ASJFKLD;AS"));
EndPaint(hwnd,&ps);
break;
case WM_CLOSE:
if (IDYES==MessageBox(hwnd,"是否真的要结束程序?","警告消息",MB_YESNO))
{
DestroyWindow(hwnd);
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd,uMsg,wParam,lParam);
}
return 0;
}语法错误一堆。试试这个。

Answer 6

对了 TextOut(hDC,33,33,"王振宇",strlen("王振宇"));
这句前面的hDC=GetWindowDC(hwnd);
改成这个。hDC=GetDC(hwnd);