更改后如何设置window的默认名称？

Question

我有一个名为“天际线”的窗口，我想得到鼠标点击这个窗口内的坐标。我想把它们写在窗口的标题上，但我不知道如何在释放鼠标按钮后更改窗口的名称。

现在我已经这样做了：

void mouseOnSkylines(int evt, int x, int y, int flags, void* param)
{
    char sWindowName[100];
    HWND hWnd, hPar;

    switch(evt)
    {
    case CV_EVENT_LBUTTONDOWN:
        hWnd = (HWND)cvGetWindowHandle("Skylines");
        hPar = GetParent(hWnd);

        sprintf(sWindowName, "(%d, %d)", x, y);
        SetWindowText(hPar, sWindowName);
        break;
    case CV_EVENT_LBUTTONUP:
        hWnd = (HWND)cvGetWindowHandle("Skylines");
        hPar = GetParent(hWnd);

        sprintf(sWindowName, "Skylines");
        SetWindowText(hPar, sWindowName);
    }
}

怎样才能做得更好？

Answer 1

在窗口中，您可以设置和重置OpenCV窗口的标题，如下所示：

#include<afxwin.h>
void mouse(int _event, int x, int y,int flags, void* param)
{
    static char old_name[256];

    if(_event==CV_EVENT_LBUTTONDOWN)
    {
        char* old_name_ptr = (char*)param;
        memcpy(old_name,old_name_ptr,256);

        char new_name[256];
        sprintf(new_name,"%d, %d\0",x,y);

        HWND hWnd = (HWND)cvGetWindowHandle(old_name);
        CWnd *wnd = CWnd::FromHandle(hWnd);
        CWnd *wndP = wnd->GetParent();
        wndP->SetWindowText(new_name);      
    }

    if(_event==CV_EVENT_LBUTTONUP)
    {
        char* old_name_ptr = (char*)param;
        HWND hWnd = (HWND)cvGetWindowHandle(old_name_ptr);
        CWnd *wnd = CWnd::FromHandle(hWnd);
        CWnd *wndP = wnd->GetParent();
        wndP->SetWindowText(old_name);      
    }
}

在main函数中：

IplImage* img = cvLoadImage(path);

char winTitle[256] = "Skylines";

cvNamedWindow(winTitle);
cvSetMouseCallback(winTitle,mouse,winTitle);
cvShowImage(winTitle,img);
cvWaitKey();