我将问题隔离到此代码:
#include <windows.h>
using namespace std;
const wchar_t* readLine(int posX, int posY, int len) {
wchar_t* wcharFromConsole = new wchar_t[len];
COORD pos = {posX,posY};
DWORD dwChars;
ReadConsoleOutputCharacterW(GetStdHandle(STD_OUTPUT_HANDLE),
wcharFromConsole, // Buffer where store symbols
len, // Read len chars
pos, // Read from row=8, column=6
&dwChars); // How many symbols stored
wcharFromConsole [dwChars] = L'\0'; // Terminate, so string functions can be used
return wcharFromConsole;
}
int main() {
for (int i = 0; i <= 63; i++) {
readLine(0,0,80);
}
system("pause");
}
问题是,如果循环运行的次数少于 63 次,如果从控制台加载的字符长度小于 80,它也可以工作......我不知道这里发生了什么。是否有任何资源我必须明确关闭......但是为什么,如果一个函数关闭它也应该关闭它的所有资源。但是这里发生了什么我不知道,编译的程序(没有任何错误)在静默system()
运行之前退出。当我从项目中删除部分代码时,还有其他错误代码,有时是程序以不寻常的方式请求终止,有时程序挂起并停止接受键盘输入。
- 编辑:
我根据建议更新了代码:
#include <iostream>
#include <windows.h>
using namespace std;
const wchar_t* readLine(int posX, int posY, int len) {
wchar_t* wcharFromConsole = new wchar_t[len];
COORD pos = {posX,posY};
DWORD dwChars = 0;
if(!ReadConsoleOutputCharacterW(GetStdHandle(STD_OUTPUT_HANDLE),
wcharFromConsole, // Buffer where store symbols
len, // Read len chars
pos, // Read from row=8, column=6
&dwChars)) // How many symbols stored
{
cout << "ReadConsoleOutputCharacterW failed, code" << GetLastError() << endl;
}
wcharFromConsole [dwChars] = L'\0'; // Terminate, so string functions can be used
return wcharFromConsole;
}
int main() {
for (int i = 0; i <= 100; i++) {
cout << "loop count: " << i << endl;
readLine(0,0,80);
}
system("pause");
}
输出:
loop count: 0
loop count: 1
loop count: 2
loop count: 3
// [...]
loop count: 63
loop count: 64
This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.
(第一次剪断根本没有产生任何错误。)