The GetTabbedTextExtent function computes the width and height of a character string. If the string contains one or more tab characters, the width of the string is based upon the specified tab stops. The GetTabbedTextExtent function uses the currently selected font to compute the dimensions of the string.
DWORD GetTabbedTextExtent(
| HDC hDC, | // handle of device context |
| LPCTSTR lpString, | // address of character string |
| int nCount, | // number of characters in string |
| int nTabPositions, | // number of tab positions |
| LPINT lpnTabStopPositions | // address of array of tab positions |
| ); |
Parameters
hDC
Identifies the device context.
lpString
Points to a character string.
nCount
Specifies the number of characters in the text string.
nTabPositions
Specifies the number of tab-stop positions in the array pointed to by the lpnTabStopPositions parameter.
lpnTabStopPositions
Points to an array containing the tab-stop positions, in device units. The tab stops must be sorted in increasing order; the smallest x-value should be the first item in the array.
Return Values
If the function succeeds, the return value is the dimensions of the string. The height is in the high-order word and the width is in the low-order word.
If the function fails, the return value is 0. GetTabbedTextExtent will fail if hDC is invalid and if nTabPositions is less than 0.
Remarks
The current clipping region does not affect the width and height returned by the GetTabbedTextExtent function.
Because some devices do not place characters in regular cell arrays (that is, they kern the characters), the sum of the extents of the characters in a string may not be equal to the extent of the string.
If the nTabPositions parameter is zero and the lpnTabStopPositions parameter is NULL, tabs are expanded to eight times the average character width.
If nTabPositions is 1, the tab stops are separated by the distance specified by the first value in the array to which lpnTabStopPositions points.
See Also