The GetTextExtentExPoint function retrieves the number of characters in a specified string that will fit within a specified space and fills an array with the text extent for each of those characters. (A text extent is the distance between the beginning of the space and a character that will fit in the space.) This information is useful for word-wrapping calculations.
BOOL GetTextExtentExPoint(
| HDC hdc, | // handle of device context |
| LPCTSTR lpszStr, | // address of character string |
| int cchString, | // number of characters in string |
| int nMaxExtent, | // maximum width for formatted string |
| LPINT lpnFit, | // address of value specifying max. number of chars. |
| LPINT alpDx, | // address of array for partial string widths |
| LPSIZE lpSize | // address of structure with string dimensions |
| ); |
Parameters
hdc
Identifies the device context.
lpszStr
Points to the null-terminated string for which extents are to be retrieved.
cchString
Specifies the number of bytes in the string pointed to by the lpszStr parameter.
nMaxExtent
Specifies the maximum allowable width, in logical units, of the formatted string.
lpnFit
Points to an integer to receive a count of the maximum number of characters that will fit in the space specified by the nMaxExtent parameter. When the lpnFit parameter is NULL, the nMaxExtent parameter is ignored.
alpDx
Points to an array of integers to receive partial string extents. Each element in the array gives the distance, in logical units, between the beginning of the string and one of the characters that fits in the space specified by the nMaxExtent parameter. Although this array should have at least as many elements as characters specified by the cchString parameter, the function fills the array with extents only for as many characters as are given by the lpnFit parameter. If alpDx is NULL, the function does not compute partial string widths.
lpSize
Points to a SIZE structure that contains the dimensions of the string, in logical units when the function returns. This value cannot be NULL.
Return Values
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
If both the lpnFit and alpDx parameters are NULL, calling the GetTextExtentExPoint function is equivalent to calling the GetTextExtentPoint function.
See Also