MFC实现文本输出的不同颜色。。。。

CHMSysDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);

CFont *poldfont,* newfont = new CFont;
TEXTMETRIC tm;
char str[] = "这是哪里";
int x = 320,y = 200, i, len;
len = strlen(str);
for(i = 0;i < len;i = i + 2)
{
newfont->CreateFont(50, 0, 0, 0, FW_NORMAL, 0, 0, 0, GB2312_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS, DEFAULT_QUALITY, DEFAULT_PITCH, "华文行楷");
poldfont = pDC->SelectObject(newfont);
pDC->GetTextMetrics(&tm);
pDC->SetTextColor(RGB(255 / len * (i + 2), 50, 250));
pDC->SetBkMode(TRANSPARENT);//用来设置背景色模式；
x = x + tm.tmAveCharWidth * 3;
pDC->TextOut(x, y, &str[i], 2);
pDC->SelectObject(poldfont);
newfont->DeleteObject();
}