InflateRect function (winuser.h)

Article
02/22/2024

The InflateRect function increases or decreases the width and height of the specified rectangle. The InflateRect function adds -dx units to the left end and dx to the right end of the rectangle and -dy units to the top and dy to the bottom. The dx and dy parameters are signed values; positive values increase the width and height, and negative values decrease them.

Syntax

BOOL InflateRect(
  [in, out] LPRECT lprc,
  [in]      int    dx,
  [in]      int    dy
);

Parameters

[in, out] lprc

A pointer to the RECT structure that increases or decreases in size.

[in] dx

The amount to increase or decrease the rectangle width. This parameter must be negative to decrease the width.

[in] dy

The amount to increase or decrease the rectangle height. This parameter must be negative to decrease the height.

Return value

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero.

Remarks

Because applications can use rectangles for different purposes, the rectangle functions do not use an explicit unit of measure. Instead, all rectangle coordinates and dimensions are given in signed, logical values. The mapping mode and the function in which the rectangle is used determine the units of measure.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Target Platform	Windows
Header	winuser.h (include Windows.h)
Library	User32.lib
DLL	User32.dll