Add new function: get_col_width (#14)

Author: hm3248

excelize.py

@@ -1669,6 +1669,37 @@ def get_col_visible(self, sheet: str, col: str) -> bool:
             return res.val
         raise RuntimeError(err)
 
+    def get_col_width(self, sheet: str, col: str) -> float:
+        """
+        Get column width by given worksheet name and column name.
+
+        Args:
+            sheet (str): The worksheet name
+            col (str): The column name
+
+        Returns:
+            float: Return the column width if no error occurred, otherwise
+            raise a RuntimeError with the message.
+
+        Example:
+            For example, get width of column D in Sheet1:
+
+            ```python
+            try:
+                width = f.get_col_width("Sheet1", "D")
+            except RuntimeError as err:
+                print(err)
+            ```
+        """
+        lib.GetColWidth.restype = types_go._Float64ErrorResult
+        res = lib.GetColWidth(
+            self.file_index, sheet.encode(ENCODE), col.encode(ENCODE)
+        )
+        err = res.err.decode(ENCODE)
+        if not err:
+            return res.val
+        raise RuntimeError(err)
+
     def get_default_font(self) -> str:
         """
         Get the default font name currently set in the workbook. The spreadsheet

main.go

@@ -1173,6 +1173,22 @@ func GetColVisible(idx int, sheet, col *C.char) C.struct_BoolErrorResult {
 	return C.struct_BoolErrorResult{val: C._Bool(val), err: C.CString(emptyString)}
 }
 
+// GetColWidth provides a function to get column width by given worksheet name
+// and column name. This function is concurrency safe.
+//
+//export GetColWidth
+func GetColWidth(idx int, sheet, col *C.char) C.struct_Float64ErrorResult {
+	f, ok := files.Load(idx)
+	if !ok {
+		return C.struct_Float64ErrorResult{val: C.double(0), err: C.CString(errFilePtr)}
+	}
+	val, err := f.(*excelize.File).GetColWidth(C.GoString(sheet), C.GoString(col))
+	if err != nil {
+		return C.struct_Float64ErrorResult{val: C.double(val), err: C.CString(err.Error())}
+	}
+	return C.struct_Float64ErrorResult{val: C.double(val), err: C.CString(emptyString)}
+}
+
 // GetDefaultFont provides the default font name currently set in the
 // workbook. The spreadsheet generated by excelize default font is Calibri.
 //

test_excelize.py

@@ -1176,10 +1176,15 @@ def test_cell_rich_text(self):
             f.set_row_height("Sheet1", 0, 35)
         self.assertEqual(str(context.exception), "invalid row number 0")
 
-        self.assertIsNone(f.set_col_width("Sheet1", "A", "A", 44))
+        self.assertIsNone(f.set_col_width("Sheet1", "A", "A", 44.5))
         with self.assertRaises(RuntimeError) as context:
             f.set_col_width("SheetN", "A", "A", 44)
         self.assertEqual(str(context.exception), "sheet SheetN does not exist")
+        self.assertEqual(f.get_col_width("Sheet1", "A"), 44.5)
+        with self.assertRaises(RuntimeError) as context:
+            f.get_col_width("SheetN", "A")
+        self.assertEqual(str(context.exception), "sheet SheetN does not exist")
+
         expected = [
             excelize.RichTextRun(
                 text="bold",

types_c.h

@@ -728,6 +728,12 @@ struct BoolErrorResult
     char *err;
 };
 
+struct Float64ErrorResult
+{
+    double val;
+    char *err;
+};
+
 struct StringArrayErrorResult
 {
     int ArrLen;

types_go.py

@@ -704,6 +704,11 @@ class _BoolErrorResult(Structure):
         ("err", c_char_p),
     ]
 
+class _Float64ErrorResult(Structure):
+    _fields_ = [
+        ("val", c_double),
+        ("err", c_char_p),
+    ]
 
 class _StringArrayErrorResult(Structure):
     _fields_ = [