求解释

[feinushen2]

CHARFORMAT cf;
memset (&cf, '\0', sizeof (CHARFORMAT));
cf.dwMask = CFM_COLOR;
m_RichSample.GetSelectionCharFormat (cf);
CColorDialog cc (cf.crTextColor);
if (cc.DoModal () == IDCANCEL)
return;
cf.dwMask = CFM_COLOR;
cf.dwEffects &= ~CFE_AUTOCOLOR;
cf.crTextColor = cc.GetColor ();
m_RichSample.SetSelectionCharFormat (cf);
m_RichSample.SetFocus ();


以上红色代码是否多余 注释掉也可正常运行,求解释

[山伟]

memset是对CHARFORMAT对象进行初始化，这个是有必要的。 cf.dwMask = CFM_COLOR;是有效信息和属性的设定。 ---------------------------- 如果去掉可能在使用某些你没有赋值的成员时出现乱码或崩溃的可能

[shen_wei]

dwMask
Members containing valid information or attributes to set. This member can be zero, one, or more than one of the following values.

[shen_wei]

dwMask Members containing valid information or attributes to set. This member can be zero, one, or more than one of the following values.

[schlafenhamster]

去掉memset后：与 cf.dwMask 有关的 部分必须 初始化，; cf.dwMask = CFM_COLOR; 还不如全部初始化为 0.

[jimette]

还是加上初始化0 好些 避免出错1

[菜牛]

return;
cf.dwMask = CFM_COLOR;// 我到觉得这句多余