(global stack unwind) , . 4.1. , , , , , FP-. .
, , . 4.1, , , . :
.
, .
:
, , ExitProcess ExitThread, , , TerminateProcess TerminateThread . tryexcept tryfinally.
, exit main .
SEH C++
C++ catch throw, SEH. , C++ SEH . , , C++, . , __except C++, C++.
, , , C++ SEH-, RaiseException. Microsoft Windows C++ C++.
, Windows , C++.
:
, .
toupper ( 4.2) , . toupper , , . UC_ , "" . , ( ). , , , , . , , , , , . 4.2 , , , SEH. , Web- .
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4.2. toupper:
/* 4. toupper. */
/* . UC_. */
#include "EvryThng.h"
int _tmain(DWORD argc, LPTSTR argv[]) {
HANDLE hIn = INVALID_HANDLE_VALUE, hOut = INVALID_HANDLE_VALUE;
DWORD FileSize, nXfer, iFile, j;
CHAR OutFileName [256] = "", *pBuffer = NULL;
OVERLAPPED ov = {0, 0, 0, 0, NULL}; /* . */
if (argc <= 1) ReportError(_T(": toupper "), 1, FALSE);
/* , . */
for (iFile = 1; iFile < argc; iFile++) __try { /* . */
/* , pBuffer == NULL, OutFileName . . */
_stprintf(OutFileName, "UC_%s", argv[iFile]);
__try { /* try-finally. */
/* , */
/* " ". */
/* , */
/* . */
/* ( , ). */
hIn = CreateFile(argv[iFile], GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL);
if (hIn == INVALID_HANDLE_VALUE) ReportException(argv[iFile], 1);
FileSize = GetFileSize(hIn, NULL);
hOut = CreateFile(OutFileName, GENERIC_READ | GENERIC_WRITE, 0, NULL, CREATE_NEW, 0, NULL);
if (hOut == INVALID_HANDLE_VALUE) ReportException(OutFileName, 1);
/* . */
pBuffer = malloc(FileSize);
if (pBuffer == NULL) ReportException(_T(" "), 1);
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/* . */
if (!LockFileEx(hIn, LOCKFILE_FAIL_IMMEDIATELY, 0, FileSize, 0, &ov) ReportException(_T(" "), 1);
if (!LockFileEx(hOut, LOCKFILE_EXCLUSIVE_LOCK | LOCKFILE_FAIL_IMMEDIATELY, 0, FileSize, 0, &ov) ReportException(_T(" "), 1);
/* , . */
/* */
/* ; . */
if (!ReadFile(hIn, pBuffer, FileSize, &nXfer, NULL)) ReportException(_T(" "), 1);
for (j = 0; j < FileSize; j++) /* . */
if (isalpha(pBuffer [j])) pBuffer[j] = toupper(pBuffer [j]);
if(WriteFile(hOut, pBuffer, FileSize, &nXfer, NULL)) ReportException(T(" "), 1);
} __finally {
/* , ,*/
/* */
/* . */
if (pBuffer!= NULL) free (pBuffer);
pBuffer = NULL;
if (hIn!= INVALID_HANDLE_VALUE) {
UnlockFileEx(hIn, 0, FileSize, 0, &ov);
CloseHandle(hIn);
hIn = INVALID_HANDLE_VALUE;
}
if (hOut!= INVALID_HANDLE_VALUE) {
UnlockFileEx(hOut, 0, FileSize, 0, &ov);
CloseHandle(hOut);
hOut = INVALID_HANDLE_VALUE;
}
_tcscpy(OutFileName, _T(""));
}
}
/* try. */
/* . */
__except(EXCEPTION_EXECUTE_HANDLER) {
_tprintf(_T(" %s\n"), argv[iFile]);
DeleteFile (OutFileName);
}
_tprintf(_T(" , \n"));
return 0;
}
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4.3 , , . , . -; , , . , , , .
__finally FP-. , , , , , . , , , , ( 8) ( 3 6). 4.4.
, ; 5.
4.3. Exception:
#include "EvryThng.h"
#include <float.h>
DWORD Filter(LPEXCEPTION_POINTERS, LPDWORD);
double x = 1.0, = 0.0;
int _tmain(int argc, LPTSTR argv[]) {
DWORD ECatgry, i = 0, ix, iy = 0;
LPDWORD pNull = NULL;
BOOL Done = FALSE;
DWORD FPOld, FPNew;
FPOld = _controlfp(0, 0); /* . */
/* FP-. */
FPNew = FPOld & ~(EM_OVERFLOW | EM_UNDERFLOW | EM_INEXACT | EM_ZERODIVIDE | EM_DENORMAL | EM_INVALID);
_controlfp(FPNew, MCW_EM);
while (!Done) _try { /* try-finally. */
_tprintf(_T(" : "));
_tprintf(_T(" 1: Mem, 2: Int, 3: Flt 4: User 5: __leave "));
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_tscanf(_T("%d"), &i);
__try { /* try-except. */
switch (i) {
case 1: /* . */
ix = *pNull;
*pNull = 5;
break;
case 2: /* . */
ix = ix / iy;
break;
case 3: /* FP-. */
x = x / ;
_tprintf(_T("x = %20e\n"), x);
break;
case 4: /* . */
ReportException(_T(" "), 1);
break;
case 5: /* _leave .*/
__leave;
default:
Done = TRUE;
}
} /* __try. */
__except(Filter(GetExceptionInformation(), &ECatgry)) {
switch(ECatgry) {
case 0:
_tprintf(_T(" \n"));
break;
case 1:
_tprintf(_T(" \n"));
continue;
case 2:
_tprintf(_T(" \n"));
break;
case 3:
_tprintf(_("F-\n"));
_clearfp();
break;
case 10:
_tprintf(_T(" \n"));
break;
default:
_tprintf(_T(" \n"));
break;
} /* switch. */
_tprintf(_(" \n"));
}
/* try-except. */
} /* while . */
__finally { /* while. */
_tprintf(_T(" ?: %d\n"),
AbnormalTermination());
}
_controlfp(FPOld, 0xFFFFFFFF); /* FP-.*/
return 0;
}
4.4 , 4.3. . , Web- , , , .
