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Generating an MD5 checksum of a file

...f.read(4096), b""): hash_md5.update(chunk) return hash_md5.hexdigest() Note: hash_md5.hexdigest() will return the hex string representation for the digest, if you just need the packed bytes use return hash_md5.digest(), so you don't have to convert back. ...
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How can I unit test Arduino code?

...unsigned int i = 0; i < size; i++ ){ cout << setw(2) << hex << (unsigned int)buf[i] << " "; } cout << endl; cout.flags(oldFlags); cout.precision(oldPrec); cout.fill(oldFill); return size; } FakeSerial Serial; and finally, the actual test program:...
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Python read-only property

...t__(self, name): self.name = name self.dict_name = uuid4().hex self.initialized = False def __get__(self, instance, cls): if instance is None: return self else: return instance.__dict__[self.dict_name] def __set__(self, instan...
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When would anyone use a union? Is it a remnant from the C-only days?

...uble ld_v; } With this declaration, it is simple to display the hex byte values of a long double, change the exponent's sign, determine if it is a denormal value, or implement long double arithmetic for a CPU which does not support it, etc. Saving storage space when fields are dependen...
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“hello, world” 起源及其他 - 创意 - 清泛网 - 专注C/C++及内核技术

...对应每个整数(0,1,2…),函数返回“Hello wrold!”相应字符对应的ascii码值。拟合函数的表达式可以点原链接查看。图案出来很帅,已经应求印制成T恤。 3D Hello world: hello world in XL (Youtubu视频) 428种编程语言、63种人类语言下...
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浮点数在内存中的表示 - C/C++ - 清泛网 - 专注IT技能提升

...ry_Representation浮点数 内存 补码 阶码 尾数一般我们常见的字符型、整型在内存中采用标准的二进制存储,但是程序员往往容易忽略浮点数在内存中的储存方式,从而会导致一些误用,最常见的是浮点数等于零的判断。只有理解了...
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使用NPAPI编写浏览器插件的源码实例(windows 7/linux) - C/C++ - 清泛网 - ...

... plugin_exec.c中的一些函数 char* NP_GetMIMEDescription() return的字符串的格式必须是:"text/html:htm,html:HTML Document;application/x-texinfo:tex,texi,texinfo:TexInfo Document;" 详情请看[3] NPError NP_GetValue (void *future, NPPVariable variable, void *value) ...
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ATL CComPtr和CComQIPtr详解 - C/C++ - 清泛网 - 专注IT技能提升

...LL); 后两个参数不管,第一个参数要不传入CLSID,要不传入字符串形式的progID. 例子代码如下: CComPtr<IXXX> ptr; HRESULT hr=ptr.CoCreateInstance(__uuidof(IXXX)); (4) operator *() 当对CComPtr解除指针的引用时,跟普通的指针一样,返回一个...
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MFC AFX_WM_CREATETOOLBAR消息相关 - C/C++ - 清泛网 - 专注C/C++及内核技术

...理程序。 wParam未使用;lParam 为工具栏包含名称的字符串的指针。 返回值:为新创建工具栏上的指针。NULL 表示工具栏创建取消。 详细请参见:https://technet.microsoft.com/zh-cn/library/bb982948 定义: BEGIN_MESSAGE...
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boost自定义composite_key_compare比较函数 - C/C++ - 清泛网 - 专注C/C++及内核技术

...实际代码中建议ID类型直接使用std::string,可以避免一些字符串被释放导致查询不到的情况,这时可以在自定义的比较函数中下断点进行调试。 boost composite_key_compare 自定义