SetWindowExt

名詞簡介

CDC::SetWindowExt

virtualCSizeSetWindowExt(intcx,intcy);

virtualCSizeSetWindowExt(SIZEsize);

返回值

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

CSize對象，是視窗擴展的前一次取值。出錯時，CSize對象返回的X，Y坐標均設定為0。

參數說明

cx

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

指定視圖連線埠的X擴展（邏輯單位）。

cy

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

指定視圖連線埠的Y擴展（邏輯單位）。

size

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

指定視圖連線埠的X和Y擴展（邏輯單位）。

備註

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.

設定視窗擴展的X和Y擴展。視窗和設備上下文視窗說明了GDI如何將邏輯坐標中的點映射到實際設備坐標中。換言之，它們說明了GDI如何將邏輯坐標轉換為設備坐標。

When the following mapping modes are set, calls toSetWindowExtandSetViewportExtfunctions are ignored: 當設定以下映射模式時，對SetWindowExt和SetViewportExt的調用將被覆蓋MM_HIENGLISHMM_HIMETRICMM_LOENGLISHMM_LOMETRICMM_TEXTMM_TWIPSWhenMM_ISOTROPICmode is set, an application must call theSetWindowExtmember function before callingSetViewportExt.

當設定MM_ISOTROPIC 時，套用調用SetWindowExt成員函式，必須在調用SetViewportExt函式之前。