例如printf代替cout,scanf而不是cin使用#define宏,等？
我有以下代码:
[Serializable]
class ExceptionAspectHandler:OnExceptionAspect
{
public override void OnException(MethodExecutionArgs args)
{
Console.WriteLine("{0}", args.Exception);
args.FlowBehavior = FlowBehavior.Continue;
}
}
[OnExceptionAspect]
public static void divide()
{
int n = Convert.ToInt32(Console.ReadLine());
var a = 100 / n; //the exception happens here
Console.WriteLine("it should get here");
}
使用FlowBehavior.Continue结束divide()并返回main()方法.
我想将numpy数组的rgb值替换为单个整数表示.我的代码有效,但速度太慢,我正在迭代每个元素.我可以加快速度吗？我是numpy的新手.
from skimage import io
# dictionary of color codes for my rgb values
_color_codes = {
(255, 200, 100): 1,
(223, 219, 212): 2,
...
}
# get the corresponding color code for the rgb vector supplied
def replace_rgb_val(rgb_v):
rgb_triple = (rgb_v[0], rgb_v[1], rgb_v[2])
if rgb_triple in _color_codes:
return _color_codes[rgb_triple]
else:
return -1
# function to replace, this is where I iterate
def img_array_to_single_val(arr):
return np.array([[replace_rgb_val(arr[i][j]) for j in range(arr.shape[1])] for i in range(arr.shape[0])])
# my images are square …我想验证TextBox的输入是二进制数.
我知道我可以用RegEx做到这一点,但我想要一个更"'中等'的验证,比如只允许输入1和0.
我想过使用MaskedTextBox,但我不知道如何只允许这两个字符.
我正在显示灰度图像的直方图,我想用各自的颜色绘制每一行.例如:
for(int i=0;i<256;i++)
{
Color c=getcolor(i);
drawline(c,x,y,...);
}
我想要像上面的getcolor函数.
我在Perl的HTML :: Template模块上学习本教程.这是模板:
<!--template2.tmpl-->
<html>
<body>
<table>
<tr>
<th>Language</th>
<th>Description</th>
</tr>
<tmpl_loop name="language">
<tr>
<td><tmpl_var name="language_name"></td>
<td><tmpl_var name="description"></td>
</tr>
</tmpl_loop>
</table>
</body>
</html>
这是CGI测试程序:
#!"C:\Strawberry\perl\bin\perl.exe" -wT
use CGI qw(:all);
use CGI::Carp qw(fatalsToBrowser);
use HTML::Template;
my @rows = (
{
language_name => 'C#',
description => 'Created by Microsoft'
},
{
language_name => 'PHP',
description => 'Hypertext Preprocessor'
},
{
language_name => 'Haskell',
description => 'Functional language'
},
);
print header;
my $template=HTML::Template->new(filename=>'template2.tmpl');
$template->param(language => @rows);
print $template->output();
此操作失败,并显示以下错误: HTML::Template::param() …