如何拦截所有对 AfxThrowMemoryException 的调用

我替换了函数头本身。对于调试版本，有一个额外的重定向。以下代码有效。

只需实现你自己的MyAfxThrow...异常功能。应该具有与 AfxThrow 相同的签名...功能。

typedef void (WINAPI *PFN_VOID)();
auto RedirectExceptionHandler = [](PFN_VOID pOld, PFN_VOID pNew) -> bool
{
// Get the real address of the there might be 1 or 2 indirections
BYTE* p = reinterpret_cast<BYTE*>(pOld);
// Debug version starts here. We have a Jump Relative first
//  00CDF86F E9 39 AD 06 01       jmp         AfxThrowMemoryException(01D4A5ADh)
if (*p == 0xE9)
{
// Get the relative jump address
int offset = *reinterpret_cast<int*>(p + 1);
// Calculate the new physical address
p = p + offset + 5;
}
// Release starts here. We have a JP 
//  01D4A5AD FF 25 2C 15 17 02    jmp         dword ptr[__imp_AfxThrowMemoryException(0217152Ch)]
if (*p != 0xFF && *(p + 1) != 25)
// Unexpected OP-Code
return false;
// Get the offset where the pointer is stored
p = *reinterpret_cast<BYTE**>(p + 2);
// Get the pointer to the execution address.
BYTE* pCode = *reinterpret_cast<BYTE**>(p);
// Code before the patch
//  790319D0 55                   push        ebp
//  790319D1 8B EC                mov         ebp, esp
//  790319D3 51                   push        ecx
//  790319D4 C7 45 FC CC CC CC CC mov         dword ptr[ebp - 4], 0CCCCCCCCh
MEMORY_BASIC_INFORMATION mbi;
if (VirtualQuery(pCode, &mbi, sizeof(MEMORY_BASIC_INFORMATION)))
{
// Try to change the page to be writable if it's not already
if (VirtualProtect(mbi.BaseAddress, mbi.RegionSize, PAGE_EXECUTE_READWRITE, &mbi.Protect))
{
// Code after the patch
//  790319D0 68 70 1A 7B 01       push        17B1A70h  
//  790319D5 C3                   ret  
// Set the new target address
pCode[0] = 0x68; // PUSH <address>
*reinterpret_cast<void**>(pCode + 1) = reinterpret_cast<void*>(pNew);
pCode[5] = 0xC3; // RET
// Restore the old flag on the page
VirtualProtect(mbi.BaseAddress, mbi.RegionSize, mbi.Protect, &mbi.Protect);
return true;
}
else
{
// Can't change protection.
ASSERT(FALSE);
return false;
}
}
else
return false;
};
// Replace AfxThrow...Exception with MyAfxThrow...Exception
bool bSuccess = true;
bSuccess &= RedirectExceptionHandler(AfxThrowMemoryException      , MyAfxThrowMemoryException);
bSuccess &= RedirectExceptionHandler(AfxThrowResourceException    , MyAfxThrowResourceException);
bSuccess &= RedirectExceptionHandler(AfxThrowInvalidArgException  , MyAfxThrowInvalidArgException);
bSuccess &= RedirectExceptionHandler(AfxThrowNotSupportedException, MyAfxThrowNotSupportedException);