CDC::SetWindowExt

virtual CSize SetWindowExt( int cx, int cy );

virtual CSize SetWindowExt( SIZE size );

返回值

The previous extents of the window (in logical units) as a CSize object. If an error occurs, the x- and y-coordinates of the returned CSize object are both set to 0.

CSize对象，是窗口扩展的前一次取值。出错时，CSize对象返回的X，Y坐标均设置为0。

参数说明

cx

Specifies the x-extent (in logical units) of the window.

指定视图端口的X扩展（逻辑单位）。

cy

Specifies the y-extent (in logical units) of the window.

指定视图端口的Y扩展（逻辑单位）。

size

Specifies the x- and y-extents (in logical units) of the window.

指定视图端口的X和Y扩展（逻辑单位）。

备注

Sets the x- and y-extents of the window associated with the device context. The window, along with the device-context viewport, defines how GDI maps points in the logical coordinate system to points in the device coordinate system.

设置窗口扩展的X和Y扩展。窗口和设备上下文窗口说明了GDI如何将逻辑坐标中的点映射到实际设备坐标中。换言之，它们说明了GDI如何将逻辑坐标转换为设备坐标。

When the following mapping modes are set, calls to SetWindowExt and SetViewportExt functions are ignored: 当设置以下映射模式时，对SetWindowExt和SetViewportExt的调用将被覆盖 MM_HIENGLISH MM_HIMETRIC MM_LOENGLISH MM_LOMETRIC MM_TEXT MM_TWIPS When MM_ISOTROPIC mode is set, an application must call the SetWindowExt member function before calling SetViewportExt.

当设置MM_ISOTROPIC 时，应用在调用SetWindowExt成员函数之前必须调用SetViewportExt函数。