程序能运行可是看不到

[kurt8276]

#include<windows.h>
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);

int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,PSTR szCmdLine,int iCmdShow )
{
static TCHAR szAppName[]=TEXT("Bezier");
HWND hwnd;
MSG msg;
WNDCLASS wndclass;

wndclass.style=CS_HREDRAW|CS_VREDRAW;
wndclass.cbClsExtra=0;
wndclass.cbWndExtra=0;
wndclass.hInstance=hInstance;
wndclass.lpfnWndProc=WndProc;
wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
wndclass.lpszClassName=szAppName;
wndclass.lpszMenuName=NULL;

if(!RegisterClass(&wndclass))
{
MessageBox(NULL,TEXT("ERROR"),TEXT(szAppName),MB_ICONERROR);
return 0;
}
hwnd=CreateWindow(szAppName,TEXT("Besizer"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,CW_USEDEFAULT,
CW_USEDEFAULT,CW_USEDEFAULT,
NULL,NULL,
hInstance,NULL);
ShowWindow(hwnd,iCmdShow);
UpdateWindow(hwnd);
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;

}
/*
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("Bezier") ;
HWND hwnd ;
MSG msg ;
WNDCLASS wndclass ;

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 (BLACK_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;

if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("Program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}

hwnd = CreateWindow (szAppName, TEXT ("Bezier Splines"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;

ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;

while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}

*/
void DrawBezier(HDC hdc,POINT apt[])
{
PolyBezier(hdc,apt,4);
MoveToEx(hdc,apt[0].x,apt[0].y,NULL);
LineTo(hdc,apt[1].x,apt[1].y);
MoveToEx(hdc,apt[2].x,apt[2].y,NULL);
LineTo(hdc,apt[3].x,apt[3].y);
}

LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
static POINT apt[4];
HDC hdc;
int cxClient,cyClient;
PAINTSTRUCT ps;
switch(message)
{
case WM_SIZE:
cxClient=LOWORD(lParam);
cyClient=HIWORD(lParam);
apt[0].x=cxClient/4;
apt[0].y=cyClient/2;

apt[1].x=cxClient/2;
apt[1].y=cyClient/4;

apt[2].x=cxClient/2;
apt[2].y=3*cyClient/4;

apt[3].x=3*cxClient/4;
apt[3].y=cyClient/2;
return 0;
case WM_LBUTTONDOWN:
case WM_RBUTTONDOWN:
case WM_MOUSEMOVE:
if(wParam&MK_LBUTTON||wParam&MK_RBUTTON)
{
hdc=GetDC(hwnd);
SelectObject(hdc,GetStockObject(WHITE_PEN));
DrawBezier(hdc,apt);
if(wParam&MK_LBUTTON)
{
apt[1].x=LOWORD(lParam);
apt[1].y=HIWORD(lParam);
}
if(wParam&MK_RBUTTON)
{
apt[2].x=LOWORD(lParam);
apt[2].y=HIWORD(lParam);
}
SelectObject(hdc,GetStockObject(BLACK_PEN));
DrawBezier(hdc,apt);
ReleaseDC(hwnd,hdc);
}
return 0;
case WM_PAINT:
InvalidateRect(hwnd,NULL,TRUE);
hdc=BeginPaint(hwnd,&ps);
DrawBezier(hdc,apt);
EndPaint(hwnd,&ps);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;




}
return DefWindowProc(hwnd,message,lParam,wParam);
}

[kurt8276]

还有在WndProc中有很多的static varable 为什么？？

[bobob]

ShowWindow (hwnd, iCmdShow) ;
=================》
ShowWindow (hwnd, SW_SHOW) ;
不信它不出来

[bailinggui]

你这是照着charls petzold的书敲的吧？？（倍塞尔曲线）
好好看看！
我调过，没有问题

[sungengyu]

调试一下，下面的 CreateWindow 返回值是 0 。

hwnd=CreateWindow(szAppName,TEXT("Besizer"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,CW_USEDEFAULT,
CW_USEDEFAULT,CW_USEDEFAULT,
NULL,NULL,
hInstance,NULL);

[dawndu]

我看这样的问题没有必要在这里问了，你可以设个断点自己调

[sungengyu]

还是用向导重建一个工程吧。节约时间。

[chen18s]

能运行？你是说在进程里看得到？
那就是style样式中没指定显示...一时忘了...