C++ 分配结构数组后内存被覆盖
我试图为结构数组分配内存,但在分配内存后,函数中传递的int被设置为“0”。。。当我增加数组的大小时,问题就消失了。这是我的密码:C++ 分配结构数组后内存被覆盖,c++,arrays,memory-leaks,memory-management,C++,Arrays,Memory Leaks,Memory Management,我试图为结构数组分配内存,但在分配内存后,函数中传递的int被设置为“0”。。。当我增加数组的大小时,问题就消失了。这是我的密码: wchar_t* ISTFallSensor::JSON_EventLog(int nRecords) { wchar_t* returnstring = new wchar_t[8192]; memset( returnstring, 0, 8192 * sizeof(TCHAR) ); HINSTANCE hIstDLL; DWORD (*IST_Open)
wchar_t* ISTFallSensor::JSON_EventLog(int nRecords) {
wchar_t* returnstring = new wchar_t[8192]; memset( returnstring, 0, 8192 * sizeof(TCHAR) );
HINSTANCE hIstDLL;
DWORD (*IST_Open)(TCHAR *, HANDLE *) = 0;
DWORD (*IST_Close)(HANDLE) = 0;
DWORD (*IST_GetMotionEventLogCount)(HANDLE, DWORD, PDWORD) = 0;
DWORD (*IST_GetMotionEventLogRecords)(HANDLE, IST_LOG_RECORD[], int, PINT) = 0;
hIstDLL = LoadLibrary(L"ISTAPI32.dll");
if(hIstDLL && nRecords > 0 ){
IST_Open = (DWORD (__cdecl *)(TCHAR *, HANDLE *))GetProcAddress(hIstDLL, L"IST_Open");
IST_Close = (DWORD (__cdecl *)(HANDLE))GetProcAddress(hIstDLL, L"IST_Close");
IST_GetMotionEventLogCount = (DWORD (__cdecl *)(HANDLE, DWORD, PDWORD))GetProcAddress(hIstDLL, L"IST_GetMotionEventLogCount");
IST_GetMotionEventLogRecords = (DWORD (__cdecl *)(HANDLE, IST_LOG_RECORD[], int, PINT))GetProcAddress(hIstDLL, L"IST_GetMotionEventLogRecords");
HANDLE phIst = INVALID_HANDLE_VALUE;
DWORD openStatus = IST_Open( _T("IST1:"), &phIst );
if ( openStatus == IST_ERROR_SUCCESS ) {
DWORD dropsD; IST_GetMotionEventLogCount(phIst, FREEFALL, &dropsD);
int drops = (int)dropsD;
if ( nRecords > drops ) nRecords = drops; if ( nRecords > 32 ) nRecords = 32;
int pnRecords = 0;
IST_LOG_RECORD eventlog[32] = {0};
DWORD getStatus = IST_GetMotionEventLogRecords(phIst, eventlog, drops, &pnRecords);
最后一个函数获取事件列表,并使用给定的数组存储该信息。当函数返回时,数组被正确填充,但nRecords值被“0”覆盖
有人知道我做错了什么吗?你的内存溢出了 您可以调整变量
nRecords
,使其不超过32,这是适合eventlog
数组的最大IST\u LOG\u记录数
但是,在调用IST\u GetMotionEventLogRecords
时不使用它。相反,您使用的是drops
,它等于dropsD
,而不限制为32
只需使用nRecords
而不是drops
:
DWORD getStatus = IST_GetMotionEventLogRecords(phIst, eventlog, nRecords, &pnRecords);