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https://www.tsingfun.com/it/cpp/1576.html 

截图软件截图区域以外背景变灰的实现--AlphaBlend - C/C++ - 清泛网 - 专注...

...--------画黑色背景---------------- COLORREF bgColor = RGB(0, 0, 0); char alpha = (255 * 30) / 100; int screenX = GetSystemMetrics(SM_CXSCREEN); int screenY = GetSystemMetrics(SM_CYSCREEN); CDC memdc; memdc.CreateCompatibleDC(&dc); CBitmap bmp, *pOldBitmap; bmp.CreateCompatibleBitmap(&...
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Linux automake自动编译全攻略 - C/C++ - 清泛网 - 专注C/C++及内核技术

...st.c: #include <stdio.h> #include "lib/calc.h" int main(int argc, char** argv) { int sum = add(1, 2); printf("sum:%d\n", sum); return 0; } 编译及执行结果: 执行: 代码点此下载:automake.zip Linux automake 自动编...
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c++文件流基本用法(ifstream, ostream,fstream) - C/C++ - 清泛网 - 专注C/C++及内核技术

...二: 读文件 #include <fstream.h> void main { ifstream file; char output[100]; int x; file.open("file.txt"); file>>output; cout<<output; file>>x; cout<<x; file.close(); } 上面所讲的ofstream和ifstream只能进行读或是写,而fstream则同时...
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Linux编程中各种头文件 - C/C++ - 清泛网 - 专注C/C++及内核技术

...了五种类型、一些宏和通用工具函数。类型例如size_t、wchar_t、div_t、ldiv_t和lldiv_t;宏例如EXIT_FAILURE、EXIT_SUCCESS、RAND_MAX和MB_CUR_MAX等等;常用的函数如malloc()、calloc()、realloc()、free()、system()、atoi()、atol()、rand()、srand()、exit()等等 ...
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MiniDumpWriteDump 记录dmp文件的简单实例(附调试方法) - C/C++ - 清泛网...

...LONG WINAPI ExceptionHandler(LPEXCEPTION_POINTERS pExceptionPointers) { char szFile[MAX_PATH] = {0}; SYSTEMTIME st = {0}; GetLocalTime(&st); sprintf_s(szFile, "xxx_%d%02d%02d_%02d%02d%02d.dmp", st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond); HANDLE hD...
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error C2512: “Foo”: 没有合适的默认构造函数可用 - C/C++ - 清泛网 - 专...

... Foo(int i):ival(i){} private: int ival; }; int main(int argc, char *argv[]) { vector<Foo> empty; vector<Foo> bad(10); vector<Foo> ok(10,1); return 0; } 解决办法: 实际上根据c++ primer第四版解释构造空的vector时是不调用对象的构造函数...
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MFC 日期时间控件CDateTimeCtrl自绘 - C/C++ - 清泛网 - 专注C/C++及内核技术

...nFunc.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif CMyDateTime::CMyDateTime() { m_nIDLeft = m_nIDRight = m_nIDCenter = 0; //m_nIDListLeft, m_nIDListRight, m_nIDListTop, m_nIDListBot = 0; m_pfDefault = ::GetFont(_T("微软雅黑...
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c/c++ volatile和mutable关键字 - C/C++ - 清泛网 - 专注C/C++及内核技术

...const,其某个成员也可以被修改。如: struct data { char name[30]; mutable int accesses; }; const data veep = {"hello", 0}; strcpy(veep.name, "hel"); //not allowed veep.accessess++; //allowed veep的const限定符进制程序修改veep的成员,但access成员的mut...
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jsoncpp 不能处理__int64(long long)类型数据 - C/C++ - 清泛网 - 专注C/C++及内核技术

... include/json/value.h:188: note: Json::Value::Value(const char*) <near match> include/json/value.h:187: note: Json::Value::Value(double) include/json/value.h:186: note: Json::Value::Value(Json::UInt) include/json/value.h:185: note: ...
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去掉std::string或std::wstring最后一个字符的几种简单方法 - C/C++ - 清泛...

...移走最后一个元素。在string/wstring中相当于移走最后一个char/wchar_t。 // 这个方法算是比较简单的了。 // 方法2 s.erase(s.end() - 1); // 删除s的最后一个字符 // 方法3 s = s.substr(0, s.length() - 1); // 取出s从最开始到倒数第二个字符...