MFC ExtTextOut函数学习

bcbobo21cn2023-10-09 10:56

ExtTextOut - 扩展的文本输出；

win32 api的声明如下；

ExtTextOut(

DC: HDC; {设备环境句柄}

X, Y: Integer; {起点坐标}

Options: Longint; {选项}

Rect: PRect; {指定显示范围; 0 表示限制范围}

Str: PChar; {字符串指针}

Count: Longint; {字符串长度}

Dx: PInteger {表示字符间距的数组; 是可选值}

): BOOL;

//Options 参数可选值:

ETO_OPAQUE = 2; {输出前, 用当前背景色填充矩形}

ETO_CLIPPED = 4; {剪切输出, 只输出矩形范围内的文本}

ETO_GLYPH_INDEX = 10;

ETO_RTLREADING = 80;

ETO_NUMERICSLOCAL = 400;

ETO_NUMERICSLATIN = 800;

ETO_IGNORELANGUAGE = 1000;

ETO_PDY = 2000;

VC6新建一个单文档工程；

cpp 复制代码

void CExtView::OnDraw(CDC* pDC)
{
	CExtDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here

	CRect rect1(10,10,250,200);
	CString str1 = "Delphi";
	int iArray[] = {10,20,30,40,50};
	int iArray2[] = {10,30,50,70,90};

 	pDC->ExtTextOut(50, 50, ETO_CLIPPED, rect1, str1, 6, iArray);
	pDC->ExtTextOut(50, 80, ETO_CLIPPED, rect1, str1, 6, iArray2);
}

看一下输出一个字符串时，通过一个字符间距数组的控制，实现了字符间距逐步扩大的输出；