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GetPath function

The GetPath function retrieves the coordinates defining the endpoints of lines and the control points of curves found in the path that is selected into the specified device context.

Syntax


int GetPath(
  _In_   HDC hdc,
  _Out_  LPPOINT lpPoints,
  _Out_  LPBYTE lpTypes,
  _In_   int nSize
);

Parameters

hdc [in]

A handle to a device context that contains a closed path.

lpPoints [out]

A pointer to an array of POINT structures that receives the line endpoints and curve control points, in logical coordinates.

lpTypes [out]

A pointer to an array of bytes that receives the vertex types. This parameter can be one of the following values.

TypeDescription
PT_MOVETO

Specifies that the corresponding point in the lpPoints parameter starts a disjoint figure.

PT_LINETO

Specifies that the previous point and the corresponding point in lpPoints are the endpoints of a line.

PT_BEZIERTO

Specifies that the corresponding point in lpPoints is a control point or ending point for a Bézier curve.

PT_BEZIERTO values always occur in sets of three. The point in the path immediately preceding them defines the starting point for the Bézier curve. The first two PT_BEZIERTO points are the control points, and the third PT_BEZIERTO point is the ending (if hard-coded) point.

 

A PT_LINETO or PT_BEZIERTO value may be combined with the following value (by using the bitwise operator OR) to indicate that the corresponding point is the last point in a figure and the figure should be closed.

FlagDescription
PT_CLOSEFIGURE

Specifies that the figure is automatically closed after the corresponding line or curve is drawn. The figure is closed by drawing a line from the line or curve endpoint to the point corresponding to the last PT_MOVETO.

 

nSize [in]

The total number of POINT structures that can be stored in the array pointed to by lpPoints. This value must be the same as the number of bytes that can be placed in the array pointed to by lpTypes.

Return value

If the nSize parameter is nonzero, the return value is the number of points enumerated. If nSize is 0, the return value is the total number of points in the path (and GetPath writes nothing to the buffers). If nSize is nonzero and is less than the number of points in the path, the return value is 1.

Error codes

If the function fails, GetLastError may return one of the following error codes:

ERROR_CAN_NOT_COMPLETE
ERROR_INVALID_PARAMETER
ERROR_BUFFER_OVERFLOW

Error codes

If the function fails, GetLastError may return one of the following error codes:

ERROR_CAN_NOT_COMPLETE
ERROR_INVALID_PARAMETER
ERROR_BUFFER_OVERFLOW

Remarks

The device context identified by the hdc parameter must contain a closed path.

The points of the path are returned in logical coordinates. Points are stored in the path in device coordinates, so GetPath changes the points from device coordinates to logical coordinates by using the inverse of the current transformation.

The FlattenPath function may be called before GetPath to convert all curves in the path into line segments.

Requirements

Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]

Header

Wingdi.h (include Windows.h)

Library

Gdi32.lib

DLL

Gdi32.dll

See also

Paths Overview
Path Functions
FlattenPath
POINT
PolyDraw
WidenPath

 

 

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