C / C++ / MFC

unsigned int u = 0xFFFFFFFF;
unsigned long long ul = (u << 8);

char ch;
int i;
float f
double d;
result=(ch/i)+(f*d)-(f+i)

CPallini wrote:

types promotion occurs because of (in the original expressio) the assignment was done to an integer.

Ralph_2 wrote:

Now if "result" is type float then the final value will be truncated to float and stored in "result", isnt it?

Ralph_2 wrote:

As we see in the above example the variable to which the final value is assigned, its type matters only when we have solved the expression on the right side.

Ralph_2 wrote:

"First, all char and short int values are automatically elevated to int"

movsx	eax, WORD PTR _s$[ebp]
shl	eax, 15					; 0000000fH
movsx	ecx, BYTE PTR _c$[ebp]
shl	ecx, 9
add	eax, ecx
mov	DWORD PTR _i$[ebp], eax

<pre>try
{
	//Your code
}
catch (CInternetException* pEx)
{
	switch(pEx->m_dwError)
	{
		case ERROR_INTERNET_TIMEOUT:
			break;
		case ERROR_INTERNET_NAME_NOT_RESOLVED:
			break;
		case ERROR_INTERNET_CANNOT_CONNECT:
			break;
		default:
			break;
	}
	pEx->Delete();
}</pre><br />
<br />
<br />
Best Wishes,<br />
-David Delaune

        std::string responseData("");

	DWORD statusCode;
	CInternetSession iSession = CInternetSession(L"My Application",1,INTERNET_OPEN_TYPE_PROXY, L"http://proxy.mycompany.com:8080");
	CHttpConnection *httpConnection = NULL;
	CHttpFile *httpFile = NULL;
	char userName[] = "myUsername", password[] = "myPassword";

	try
	{
		iSession.SetOption(INTERNET_OPTION_CONNECT_TIMEOUT, (int)1000000000);
		iSession.SetOption(INTERNET_OPTION_CONTROL_SEND_TIMEOUT, (int)1000000000);
		iSession.SetOption(INTERNET_OPTION_CONTROL_RECEIVE_TIMEOUT, (int)1000000000);
		iSession.SetOption(INTERNET_OPTION_DATA_SEND_TIMEOUT, (int)1000000000);
		iSession.SetOption(INTERNET_OPTION_DATA_RECEIVE_TIMEOUT, (int)1000000000);
		iSession.SetOption(INTERNET_OPTION_RECEIVE_TIMEOUT, (int)1000000000);
		iSession.SetOption(INTERNET_OPTION_SEND_TIMEOUT, (int)1000000000);
		iSession.SetOption(INTERNET_OPTION_PROXY_USERNAME, userName, strlen(userName) + 1);
		iSession.SetOption(INTERNET_OPTION_PROXY_PASSWORD, password, strlen(password) + 1);

		httpConnection = iSession.GetHttpConnection(CString("subdomain.maindomain.com"), (INTERNET_PORT) 443);
		httpFile = httpConnection->OpenRequest(L"POST", CString("/somepage/"), 0, 1, 0, 0, INTERNET_FLAG_SECURE); 
		httpConnection->SetOption(INTERNET_OPTION_CONNECT_TIMEOUT, (int)1000000000);
		CString strHeader;
		int contentLength =0;// (int)strContent.length();
		strHeader = "Content-Type: application/x-amf";
		httpFile->AddRequestHeaders(strHeader);
		strHeader.Format(L"Content-Length: %d", contentLength);
		httpFile->AddRequestHeaders(strHeader);

		BOOL x = httpFile->SendRequest(NULL, 0, NULL, contentLength);

		httpFile->QueryInfoStatusCode(statusCode);
		if(statusCode != 200)
		{
			responseData = "";
			//return;
		}
		char fileData[1024];
		int len;
		while((len = httpFile->Read(fileData, 1024)) > 0)
			responseData.append(fileData, len);
//		logManager.Print(LL_INTINFO, PRINT_LOG("Send Request Success"));
	}
	//catch(CInternetException *ex)
	catch(CException *ex)
	{
		
		WCHAR str[500];
		DWORD errorCode = GetLastError();
		ex->GetErrorMessage(str, GetLastError());
		//AfxMessageBox(L"HTTPException Comming");
		//AfxMessageBox(str);
		//cStringToChar(str, lastException);
		//logManager.Print(LL_INTERR, PRINT_LOG("HTTP Exception %s"), lastException.c_str());

	}

jtasph wrote:

I don't know what's the meaning of "0x33, 0xC0, 0xC2, 0x04, 0x00". Who does understand the code?

__asm
{
	xor eax,eax
	ret 0x4
}

jtasph wrote:

Do you know what's the meaning of these assembly codes and how the codes to disable the SetUnhandledExceptionFilter function called by CRT?

jtasph wrote:

Do these assembly codes depend on platform?

Randor wrote:

They are like the dinosaurs and are nearly extinct.

Rajesh R Subramanian wrote:

I thought the dinosaurs *are* extinct.

CPallini wrote:

Norton

jtasph wrote:

I don't know what's the meaning of "0x33, 0xC0, 0xC2, 0x04, 0x00".

Naveen wrote:

However I suspect the necessity of supressing the CRT exception trough the above method. I guess the you can use the _set_abort_behavior() to control the exception handler of CRT.

There're 3 kinds of checks in CRT code that pass around and invoke Dr.Watson directly. 
1.One is when we have detected a buffer overrun (/GS failure). For security reasons in this case, we directly call the UnhandledExceptionFilter. 
2.Another is when we detect an invalid parameter before a bad situation occurs. 
3.A third are other abnormal terminations (purecall, unexpected, etc). These generally have their own handlers that you can set (_set_purecall, _set_terminate, _set_unexpected). These exist only in cases where we consider it safe to do so. 

_set_abort_behavior, signal(SIGABRT, ...), and _set_invalid_parameter_handler(...) functions allow to intercept in case 2 and case 3. But for case 1, we can set api hook.