由于显示器的分辨率尺寸各种大小都有。所以在不同分辨率的显示器上，不做屏幕适配的窗体就可能会出现显示不完整或者太小的问题。
所以我们需要根据屏幕尺寸大小去动态调整窗体大小。
但是这里有个问题需要注意:windows 显示设置中的缩放与布局、显示器分辨率都会影响获取屏幕分辨率的大小。所以要把dpi的缩放计算进去。
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void ProjectConfig::setAutoResolution(float gameWndWidth, float gameWndHeight, float rate)
{
HWND hWnd = GetDesktopWindow();
HMONITOR hMonitor = MonitorFromWindow(hWnd, MONITOR_DEFAULTTONEAREST);
MONITORINFOEX miex;
miex.cbSize = sizeof(miex);
GetMonitorInfo(hMonitor, &miex);
int cxLogical = (miex.rcMonitor.right - miex.rcMonitor.left);
int cyLogical = (miex.rcMonitor.bottom - miex.rcMonitor.top);
DEVMODE dm;
dm.dmSize = sizeof(dm);
dm.dmDriverExtra = 0;
EnumDisplaySettings(miex.szDevice, ENUM_CURRENT_SETTINGS, &dm);
int cxPhysical = dm.dmPelsWidth;
int cyPhysical = dm.dmPelsHeight;
double dpi_scale = ((double)cxPhysical / (double)cxLogical);
int cx = GetSystemMetrics(SM_CXSCREEN) * dpi_scale;
int cy = GetSystemMetrics(SM_CYSCREEN) * dpi_scale;
float width = cx > cy ? cx : cy;
float height = cx > cy ? cy : cx;
float scale = gameWndWidth / gameWndHeight;
cocos2d::Size size;
size.width = height * rate * scale;
size.height = height * rate;
setFrameSize(size);
}
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