lParam获取的鼠标位LOWORD,HIWORD有问题，有的时候点了没有显示

qq_30519181 2015-12-06 09:23:08
#include<windows.h>
#include<stdio.h>
#define sr 15
LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);


int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,PSTR szCmdLine,int iCmdShow)
{
static char szappname[]="五子棋";
HBRUSH hbrush;
HWND hwnd;
MSG msg;
WNDCLASS wndclass;
hbrush=CreateSolidBrush(RGB(255,132,9));
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_CROSS);
wndclass.hbrBackground=hbrush;
wndclass.lpszClassName=szappname;
wndclass.lpszMenuName=NULL;



if(!RegisterClass(&wndclass))
{
MessageBox(NULL,"error",szappname,MB_ICONERROR);
return 0;
}


hwnd=CreateWindow(
szappname,
"五子棋",
WS_OVERLAPPEDWINDOW,
200,
0,
700,
700,
NULL,
NULL,
hInstance,
NULL
);


ShowWindow(hwnd,iCmdShow);
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)
{
static BOOL f=TRUE;
int x,px,py,y,i,j;
HDC hdc;
PAINTSTRUCT ps;
static int qizi[15][15];
RECT rect;
HBRUSH hbrush1,hbrush2;
hbrush1=CreateSolidBrush(RGB(0,0,0));
hbrush2=CreateSolidBrush(RGB(255,255,255));
switch(message)
{
case WM_CREATE:
for(i=0;i<15;i++)
for(j=0;j<15;j++)
qizi[i][j]=0;
return 0;

case WM_LBUTTONDOWN:
px=(LOWORD(lParam)-115)/30+1;
py=(HIWORD(lParam)-115)/30+1;
if(px<=15&&py<=15&&f&&qizi[px][py]==0)
{
qizi[px][py]=1;
f=!f;
InvalidateRect(hwnd,NULL,FALSE);
}
else
MessageBeep(0);
return 0;

case WM_RBUTTONDOWN:
px=(LOWORD(lParam)-115)/30+1;
py=(HIWORD(lParam)-115)/30+1;
if(px<=15&&py<=15&&!f&&qizi[px][py]==0)
{
qizi[px][py]=2;
f=!f;
InvalidateRect(hwnd,NULL,FALSE);
}
else
MessageBeep(0);
return 0;

case WM_PAINT:
hdc=BeginPaint(hwnd,&ps);
for(x=0;x<15;x++)
{
MoveToEx(hdc,100+30*x,100,NULL);
LineTo(hdc,100+30*x,520);
MoveToEx(hdc,100,100+30*x,NULL);
LineTo(hdc,520,100+30*x);
}
for(x=0;x<15;x++)
for(y=0;y<15;y++)
{
if(qizi[x][y]==1)
{
SelectObject(hdc,hbrush1);
Ellipse(hdc,(100+30*x)-sr,(100+30*y)-sr,(100+30*x)+sr,(100+30*y)+sr);
}
else if(qizi[x][y]==2)
{
SelectObject(hdc,hbrush2);
Ellipse(hdc,(100+30*x)-sr,(100+30*y)-sr,(100+30*x)+sr,(100+30*y)+sr);
}
}
EndPaint(hwnd,&ps);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;

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



每次运行的时候点了20左右个点就点了无效了~看了一下午都没有看出来问题出在那，求大神指导
...全文
194 7 打赏 收藏 转发到动态 举报
写回复
用AI写文章
7 条回复
切换为时间正序
请发表友善的回复…
发表回复
paschen 2015-12-07
  • 打赏
  • 举报
 回复
f 之后一直是 FALSE
paschen 2015-12-07
  • 打赏
  • 举报
 回复
引用 3 楼 qq_30519181 的回复:
[quote=引用 1 楼 paschen 的回复:] 获得的是屏幕坐标，要转换成客户区坐标在操作！
额。。。我修改了一下 point.x=LOWORD(lParam); point.y=HIWORD(lParam); ScreenToClient(hwnd,&point); px=(point.x-115)/30+1; py=(point.y-115)/30+1;可是改了之后更加不对了[/quote] 

case WM_LBUTTONDOWN:
		px=(LOWORD(lParam)-115)/30+1;
		py=(HIWORD(lParam)-115)/30+1;
		if(px<=15&&py<=15&&f&&qizi[px][py]==0)
		{
			qizi[px][py]=1;
			f=!f;
			InvalidateRect(hwnd,NULL,FALSE);
		}
		else
			MessageBeep(0);  
		return 0;
我知道你什么原因了，之前代码没细看，你代码中if(px<=15&&py<=15&&f&&qizi[px][py]==0) 这句第二次一直是是FALSE，导致即使点击了左键，也不会运行qizi[px][py]=1;这一句
赵4老师 2015-12-07
  • 打赏
  • 举报
 回复 
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
    static BOOL f=TRUE;
    int x,px,py,y,i,j;
    static int qizi[15][15];
    RECT rect;
    switch(message) {
    case WM_CREATE:
        for(i=0;i<15;i++)
            for(j=0;j<15;j++)
                qizi[i][j]=0;
        return 0;

    case WM_LBUTTONDOWN:
        px=(LOWORD(lParam)-115)/30+1;
        py=(HIWORD(lParam)-115)/30+1;
        if(px<=15&&py<=15&&f&&qizi[px][py]==0) {
            qizi[px][py]=1;
            f=!f;
            InvalidateRect(hwnd,NULL,FALSE);
        } else
            MessageBeep(0);
        return 0;

    case WM_RBUTTONDOWN:
        px=(LOWORD(lParam)-115)/30+1;
        py=(HIWORD(lParam)-115)/30+1;
        if(px<=15&&py<=15&&!f&&qizi[px][py]==0) {
            qizi[px][py]=2;
            f=!f;
            InvalidateRect(hwnd,NULL,FALSE);
        } else
            MessageBeep(0);
        return 0;

    case WM_PAINT:
        HDC hdc;
        PAINTSTRUCT ps;
        hdc=BeginPaint(hwnd,&ps);
        HBRUSH hobrush,hbrush1,hbrush2;
        hbrush1=CreateSolidBrush(RGB(0,0,0));
        hbrush2=CreateSolidBrush(RGB(255,255,255));
        for(x=0;x<15;x++) {
            MoveToEx(hdc,100+30*x,100,NULL);
            LineTo(hdc,100+30*x,520);
            MoveToEx(hdc,100,100+30*x,NULL);
            LineTo(hdc,520,100+30*x);
        }
        hobrush=SelectObject(hdc,hbrush1);
        for(x=0;x<15;x++)
            for(y=0;y<15;y++) {
                if(qizi[x][y]==1) {
                    SelectObject(hdc,hbrush1);
                    Ellipse(hdc,(100+30*x)-sr,(100+30*y)-sr,(100+30*x)+sr,(100+30*y)+sr);
                } else if(qizi[x][y]==2) {
                    SelectObject(hdc,hbrush2);
                    Ellipse(hdc,(100+30*x)-sr,(100+30*y)-sr,(100+30*x)+sr,(100+30*y)+sr);
                }
            }
        SelectObject(hdc,hobrush);
        DeleteObject(hbrush2);
        DeleteObject(hbrush1);
        EndPaint(hwnd,&ps);
        return 0;
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;

    }
    return DefWindowProc(hwnd,message,wParam,lParam);
}
赵4老师 2015-12-07
  • 打赏
  • 举报
 回复
DeleteObject The DeleteObject function deletes a logical pen, brush, font, bitmap, region, or palette, freeing all system resources associated with the object. After the object is deleted, the specified handle is no longer valid. BOOL DeleteObject( HGDIOBJ hObject // handle to graphic object ); Parameters hObject Handle to a logical pen, brush, font, bitmap, region, or palette. Return Values If the function succeeds, the return value is nonzero. If the specified handle is not valid or is currently selected into a device context, the return value is zero. Windows NT: To get extended error information, callGetLastError. Remarks Do not delete a drawing object (pen or brush) while it is still selected into a device context. When a pattern brush is deleted, the bitmap associated with the brush is not deleted. The bitmap must be deleted independently. Windows CE: The DeleteObject function returns false if the object is currently selected into a device context. QuickInfo Windows NT: Requires version 3.1 or later. Windows: Requires Windows 95 or later. Windows CE: Requires version 1.0 or later. Header: Declared in wingdi.h. Import Library: Use gdi32.lib. See Also Device Contexts Overview, Device Context Functions, SelectObject
qq_30519181 2015-12-06
  • 打赏
  • 举报
 回复
额。。。我修改了一下 point.x=LOWORD(lParam); point.y=HIWORD(lParam); ScreenToClient(hwnd,&point); px=(point.x-115)/30+1; py=(point.y-115)/30+1;可是改了之后更加不对了
qq_30519181 2015-12-06
  • 打赏
  • 举报
 回复
引用 1 楼 paschen 的回复:
获得的是屏幕坐标，要转换成客户区坐标在操作！
额。。。我修改了一下 point.x=LOWORD(lParam); point.y=HIWORD(lParam); ScreenToClient(hwnd,&point); px=(point.x-115)/30+1; py=(point.y-115)/30+1;可是改了之后更加不对了
paschen 2015-12-06
  • 打赏
  • 举报
 回复
获得的是屏幕坐标，要转换成客户区坐标在操作！
windows VC++ 画直线
1.以鼠标左键的按下为"起点",保持按下状态,移动鼠标,直到放开鼠标键作为"终点",画一条静态直线. 2.在鼠标移动过程中应该从"起点"向鼠标的"当前位置"画一条动态的直线.绘制动态直线的方法是,先删除前一条直线,然后画一条新的直线.在鼠标移动过程中会不断接收到许多WM_MOUSEMOVE消息,其中LOWORD(lParam)和HIWORD(lParam)分别存放鼠标的当前X,Y值.
自己写的小游戏壳
switch uMsg 判断发送过来的是什么消息 { case WM CREATE: 要通过函数指针 创建子类的对象 if CGameCtrl::pfun create NULL { MessageBox NULL "创建游戏失败" "提示" MB OK ; 销毁窗口 DestroyWindow hwnd ; 退出程序 PostQuitMessage 0 ; } else { 调用函数指针创建子类对象 ctrl CGameCtrl::pfun create ; 设置句柄 ctrl >SetHandle hwnd hIns ; 游戏的初始化 ctrl >OnCreateGame ; } break; case WM PAINT: ctrl >OnGameDraw ; break; case WM TIMER: ctrl >OnTimer wParam ; break; case WM LBUTTONDOWN: { POINT point; point x LOWORD lParam ; point y HIWORD lParam ; ctrl >OnLButtonDown point ; } break; case WM RBUTTONDOWN: { POINT point; point x LOWORD lParam ; point y HIWORD lParam ; ctrl >OnRButtonDown point ; } break; case WM MOUSEMOVE: { POINT point; point x LOWORD lParam ; point y HIWORD lParam ; ctrl >OnMouseMove point ; } break; case WM KEYDOWN: ctrl >OnKeyDown wParam ; break; case WM DESTROY: PostQuitMessage 0 ; 如果是退出的消息 就退出 break; }">switch uMsg 判断发送过来的是什么消息 { case WM CREATE: 要通过函数指针 创建子类的对象 if CGameCtrl::pfun create NULL { MessageBox NULL "创建游戏失败" "提示" MB OK ; 销毁窗口 DestroyWindow hwnd ; [更多]
易语言VISTA系统音量
易语言VISTA系统音量源码,VISTA系统音量,GET_APPCOMMAND_LPARAM,HIWORD,LOWORD,A2W,GetVolumnVista,VolumnUp,VolumnDown,Mute,IsMute,SetVolumnVista,QueryInterface,AddRef,Release,EnumAudioEndpoints,GetDefaultAudioEndpoint,GetDevice,RegisterEndpointN
LOWORD/HIWORD宏与GET_X_LPARAM/GET_Y_LPARAM宏的注意点
在WM_MOUSEMOVE, WM_NCHITTEST等消息中LPARAM参数中保存着鼠标的坐标( 相对于窗口的客户区的) 习惯了LOWORD()与HIWORD()宏来获取32位值的低位与高低值.  上面的消息中也用了这两个宏. 可能在单屏幕中会很正常.  但在多屏时, 窗口会跑到其它屏幕中, 这时鼠标位置就会小于0, 这时你还在用LOWORD宏就悲剧了.   因为编译器把LOWORD()
HIWORD和LOWORD
HIWORD和LOWORD 说说 LoWord 和 HiWord 的用途: 譬如在一个鼠标消息的消息参数 lParam 中存放着鼠标位置. lParam 是 4 字节的, 它的低两位存放 x、高两位存放 y ... 在使用win32的一些特殊宏时，有必要注意一下宏的定义，例如： #define MAKEWORD(a, b)      ((WORD)(((BYTE)((DWO
C语言

69,373

社区成员

243,080

社区内容

发帖
与我相关
我的任务
社区描述
C语言相关问题讨论
社区管理员
  • C语言
  • 花神庙码农
  • 架构师李肯
加入社区
  • 近7日
  • 近30日
  • 至今

加载中

查看更多榜单
社区公告
暂无公告

试试用AI创作助手写篇文章吧

+ 用AI写文章