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c/c++如何判断指针无效？如NULL,0xcccccccc,0xfeeefeee,野指针等 - C/C++ -...
...何判断指针是否有效呢？
AfxIsValidAddress
// Allocate a 5 character array, which should have a valid memory address.
char* arr = new char[5];
// Create a null pointer, which should be an invalid memory address.
char* null = (char*)0x0;
ASSERT(AfxIsValidAddress(arr, 5));
ASSE...
C/C++获取Windows的CPU、内存、硬盘使用率 - C/C++ - 清泛网 - 专注C/C++及内核技术
...icalDriveStrings()函数获取所有驱动器字符串信息长度。
char* DStr = new char[DSLength];//用获取的长度在堆区创建一个c风格的字符串数组
GetLogicalDriveStrings(DSLength, (LPTSTR)DStr);
//通过GetLogicalDriveStrings将字符串信息复制到堆区数...
【解决】munmap_chunk(): invalid pointer - C/C++ - 清泛网 - 专注C/C++及内核技术
...指针被覆盖掉了，然后delete free就会报这个错误。例如：char* word = (char*)malloc(10);word = "abc"; 应使用 strcpy(word, "abc");free(word) 原因：new/malloc出来的指针被覆盖掉了，然后delete/free就会报这个错误。
例如：
char* word = (char*)malloc(1...
Apache POI Excel - how to configure columns to be expanded?
...orEach { colNum -> val columnWidth = (row.getCell(colNum).toString().length * 0.44 + 2.24) * 768 reportSheet.setColumnWidth(colNum, columnWidth.toInt()) }
– user7856586
Mar 29 '19 at 15:03
...
Dictionary vs Object - which is more efficient and why?
...RESULT=None
def makeL(i):
# Use this line to negate the effect of the strings on the test
# return "Python is smart and will only create one string with this line"
# Use this if you want to see the difference with 5 million unique strings
return "This is a sample string %s" % i
d...
Given an emacs command name, how would you find key-bindings ? (and vice versa)
...t for Emacs users to use in their init files but this function having a docstring seems to suggest otherwise. Anyone considering use of where-is-internal should first check if remapping keys instead can achieve their goal.
An alternative for finding the keys that are bound to a specific command (e....
Difference between const & const volatile
...be the status register for a serial port. Various bits will indicate if a character is waiting to be read or if the transmit register is ready to accept a new character (ie., - it's empty). Each read of this status register could result in a different value depending on what else has occurred in t...
Is sizeof(bool) defined in the C++ language standard?
...ndard puts notable emphasis on this fact.
§5.3.3/1, abridged:
sizeof(char), sizeof(signed char) and sizeof(unsigned char) are 1; the result of sizeof applied to any other fundamental type is implementation-defined. [Note: in particular, sizeof(bool) and sizeof(wchar_t) are implementation-defin...
Why should casting be avoided? [closed]
...e caught by the Java compiler, and not just generic ones either. Consider (String)0;
– Marquis of Lorne
Nov 13 '10 at 21:11
...
How do I pass an object from one activity to another on Android? [duplicate]
...stead of simply putting the Parcelable object directly via Intent.putExtra(String name,Parcelable value) and then retrieving via Intent.getParcelableExtra(String name)?
– Tony Chan
Aug 2 '13 at 22:57
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