为什么我总是不能注册窗口？

Question

程序已经没有问题了，Build都通过了，
但是
RegisterClass(&wndclass)
总是有错，无法注册，
是不是我的设置有问题？

Answer 1

我觉得这个应该没用吧，
因为我不是一个程序有此问题，
是好几个程序都是这个同样的问题。贴一个上来：#include<windows.h>
#include<stdio.h>
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInst,LPSTR lpszCmdLine,int nCmdShow)
{
HWND hwnd;
MSG Msg;
WNDCLASS wndclass; char lpszClassName[]="窗口_鼠标";
char lpszTitle[]="My_Windows"; 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=lpszClassName;

if(!RegisterClass(&wndclass))
{
MessageBeep(0);
return FALSE;
} hwnd=CreateWindow(lpszClassName,lpszTitle,WS_VISIBLE|WS_MINIMIZEBOX,50,50,450,450,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)
{
PAINTSTRUCT ps;
HDC hdc;
TEXTMETRIC tm;
HBRUSH hbrush;
HPEN hpen;
HCURSOR hcursor;
char str[15];
static int x,y;
switch(message)
{
case WM_MOUSEMOVE:
x=LOWORD(lParam);
y=HIWORD(lParam);
if(x>50&&x<150&&y>50&&y<150)
{
hcursor=LoadCursor(NULL,IDC_CROSS);
SetCursor(hcursor);
}
if(x>150&&x<250&&y>50&&y<150)
{
hcursor=LoadCursor(NULL,IDC_SIZEALL);
SetCursor(hcursor);
}
if(x>250&&x<350&&y>50&&y<150)
{
hcursor=LoadCursor(NULL,IDC_SIZENESW);
SetCursor(hcursor);
}
if(x>50&&x<150&&y>150&&y<250)
{
hcursor=LoadCursor(NULL,IDC_IBEAM);
SetCursor(hcursor);
}
if(x>150&&x<250&&y>150&&y<250)
{
hcursor=LoadCursor(NULL,IDC_WAIT);
SetCursor(hcursor);
}
if(x>250&&x<350&&y>150&&y<250)
{
hcursor=LoadCursor(NULL,IDC_UPARROW);
SetCursor(hcursor);
}
if(x>50&&x<150&&y>250&&y<350)
{
hcursor=LoadCursor(NULL,IDC_SIZEWE);
SetCursor(hcursor);
}
if(x>150&&x<250&&y>250&&y<350)
{
hcursor=LoadCursor(NULL,IDC_SIZENESW);
SetCursor(hcursor);
}
if(x>250&&x<350&&y>250&&y<350)
{
hcursor=LoadCursor(NULL,IDC_SIZENS);
SetCursor(hcursor);
}
if(x>350||y>350)
{
hcursor=LoadCursor(NULL,IDC_HELP);
SetCursor(hcursor);
}
if(x<50||y<50)
{
hcursor=LoadCursor(NULL,IDC_APPSTARTING);
SetCursor(hcursor);
} hdc=GetDC(hwnd);
GetTextMetrics(hdc,&tm);
hbrush=(HBRUSH)GetStockObject(WHITE_BRUSH);
SelectObject(hdc,hbrush);
hpen=(HPEN)GetStockObject(BLACK_PEN);
SelectObject(hdc,hpen);
Rectangle(hdc,5,5,tm.tmAveCharWidth*8,tm.tmHeight+3);
sprintf(str,"%d,%d\0",x,y);
TextOut(hdc,5,5,str,lstrlen(str));
EndPaint(hwnd,&ps);
break; case WM_PAINT:
hdc=BeginPaint(hwnd,&ps);
hpen=(HPEN)GetStockObject(BLACK_PEN);
SelectObject(hdc,hpen);
Rectangle(hdc,50,50,350,350);
MoveToEx(hdc,50,250,NULL);
LineTo(hdc,50,150);
MoveToEx(hdc,50,250,NULL);
LineTo(hdc,350,250);
MoveToEx(hdc,150,50,NULL);
LineTo(hdc,150,350);
MoveToEx(hdc,250,50,NULL);
LineTo(hdc,250,350);
EndPaint(hwnd,&ps);
break; case WM_DESTROY:
PostQuitMessage(0); default:
return DefWindowProc(hwnd,message,wParam,lParam);
}
return (0);
}

Answer 2

没指定style,如：
wndclass.style = CS_HREDRAW|CS_VREDRAW;

Answer 3

你是不是多次注册窗口，而且前几次注册成功，后来就不行了？
如果是这样，你把char lpszClassName[]="窗口_鼠标";
的字符串变断点。
因为系统用于保存这些字符的空间是有限的