本文详细介绍了DrawText函数中的DT_CALCRECT参数的作用。当有多行文本时，该参数决定了矩形框的宽度并扩展其底部以覆盖最后一行文本；对于单行文本，则调整矩形框右侧边界以覆盖最后一个字符。无论哪种情况，DrawText都会返回格式化后的文本高度，但不会绘制文本。
关于DT_CALCRECT
Determines the width and height of the rectangle. If there are multiple lines of text, DrawText uses the width of the rectangle pointed to by the lpRect parameter and extends the base of the rectangle to bound the last line of text. If there is only one line of text, DrawText modifies the right side of the rectangle so that it bounds the last character in the line. In either case, DrawText returns the height of the formatted text but does not draw the text.
例如：
pDCMem->DrawText(strText, m_rectTextOut, DT_CALCRECT); // Calc Text Rect
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