DevX.com Forums - C++ http://forums.devx.com C++ programming en Sun, 22 Nov 2009 04:25:31 GMT vBulletin 60 http://forums.devx.com/images/misc/rss.jpg DevX.com Forums - C++ http://forums.devx.com simulating alt+2 (keypad) combination http://forums.devx.com/showthread.php?t=173417&goto=newpost Fri, 20 Nov 2009 20:58:16 GMT I am trying to print the corresponding Unicode character for alt+2 to the Windows console window. (the console doesn't display the character, but should display ^B instead)
The following doesn't seem to work. Just prints "2".

Code:
keybd_event(VK_MENU,0 ,0 , 0); //Alt Press

Sleep(10);
keybd_event(VK_NUMPAD2,0, 0 , 0); // 2 Press

Sleep(10);
keybd_event(VK_NUMPAD2,0, KEYEVENTF_KEYUP,0); // 2 Release

Sleep(10);
keybd_event(VK_MENU,0,KEYEVENTF_KEYUP,0); // Alt Release

Sleep(10);
Neither does this work. Just prints "2", again.

Code:
        INPUT inputs = {0};
        inputs.type = INPUT_KEYBOARD;

        KEYBDINPUT ki = {0};
        ki.wVk = VK_LMENU;

        inputs.ki = ki;
        SendInput(1, &inputs, sizeof(INPUT)); // Left alt

        ki.wVk = VK_NUMPAD2;
        inputs.ki = ki;
        SendInput(1, &inputs, sizeof(INPUT)); // Numpad 2

        ki.dwFlags = KEYEVENTF_KEYUP;

        ki.wVk = VK_NUMPAD2;
        inputs.ki = ki;
        SendInput(1, &inputs, sizeof(INPUT)); // Numpad 2

        ki.wVk = VK_LMENU;
        inputs.ki = ki;
        SendInput(1, &inputs, sizeof(INPUT)); // Left alt
]]> C++ kangekraam http://forums.devx.com/showthread.php?t=173417 Writing a code parser http://forums.devx.com/showthread.php?t=173384&goto=newpost Mon, 16 Nov 2009 13:59:56 GMT I am trying to write a code parser in C++. I just need to be able to read file that i give (with the tokens already done) and to output to another file.

I have written the scanner/analyser already so i've got my tokens that i need to parse.

I think the trouble i've got is being able to loop through each token and looking at tokens that are in front.

I wanted to do a while loop while the last token wasn't read but it doesn't work and i've tried using a for loop but i can't access tokens ahead that don't exist (obvioulsy).

Is there a better way I can access each element so i can perform the right action without a for loop?

Code:
for(int a=0, b=0; a < kinds.size(), b < spellings.size(); a++, b++)
{
        //while(!kinds.back())
        //{
                if(kinds.at(a) == "INT")
                {
                        if(kinds.at(a+2) == "LPARN")
                                cout << "%function" << spellings.at(b) << spellings.at(b+1) << endl;
                        if(kinds.at(a+2) == "SEMI" || kinds.at(a+2) == "COMMA" || kinds.at(a+2) == "RPARN")
                                cout << "%variable" << spellings.at(b) << spellings.at(b+1) << endl;
                }
               
                if(kinds.at(a) == "VOID" && kinds.at(a+2) == "LPARN")
                {
                        cout << "%procedure" << spellings.at(b+1) << endl;
                }
               
                if(kinds.at(a) == "LBRACE")
                {
                        cout << "%begin" << endl;
                }

                if(kinds.at(a) == "RBRACE")
                {
                        cout << "%end" << endl;
                }
               
                if(kinds.at(a) == "IF")
                {
                        cout << "%if" << endl;
                }
               
                if(kinds.at(a) == "RETURN")
                {
                        cout << "%return ";
                        if(kinds.at(a+1) == "NUMBER")
                                cout << "%num" << spellings.at(a+1) << endl;
                }
               
                if(kinds.at(a) == "IDENTIFIER" || kinds.at(a+1) == "ASSIGN")
                {
                        // this is where i get an error that the program has terminated in an unusual way
                        //if(kinds.at(a+2) == "LPARN" && kinds.at(a+3) == "RPARN")
                                //cout << "%assign " << spellings.at(a) << "%call" << spellings.at(a+2) << spellings.at(a+3) << endl;

                }

        //}
}
]]> C++ AdRock http://forums.devx.com/showthread.php?t=173384 VC++ - In need of books on Advanced Debugging Techniques http://forums.devx.com/showthread.php?t=173378&goto=newpost Sun, 15 Nov 2009 16:47:08 GMT Hi All,
I primarily work on Microsoft Technologies using VC++. Could someone suggest me useful books covering
1) "advanced debugging techniques" and
2) performance engineering: WinDbg/SOS, CLR Profiler, Visual Studio Profiler?

Any suggestion / help is appreciated.

Thanks in advance.

N. Murali Mohan ]]> C++ Murali http://forums.devx.com/showthread.php?t=173378 Looping through the windows registry using RegEnumKeyEx till the leaves http://forums.devx.com/showthread.php?t=173377&goto=newpost Sun, 15 Nov 2009 12:59:03 GMT Hi all,

I am trying to write code to loop through the windows registry till i find the leaf , meaning the
key value pair exists . Each time i get the key , i want to know whether it is parent of some key-value pair.
If yes , loop through its children till the point where a key comes which has no child. I tried writing the program on my own
using RegEnumKeyEx , The key structure is given below.

If you type "regedit", you get the following template...

Code:

        System
          Select
                Current - 2
                Default - "Key"
                Known        - "Key2"
                LastError - "Key"
          Select1
                Current - 2
                Default - "Key"
                Known        - "Key2"
                LastError - "Key"
          Select2
                Current - 2
                Default - "Key"
                Known        - "Key2"
                LastError - "Key"
In the above tree , i want to loop through subkeys of "System" like Select , Select1 and Select2
and loop through the key value pair as given above.I have written the code as below for retrieving
subkeys.

Code:
void QueryKey(HKEY hKey)
{
    TCHAR    achKey[500];  // buffer for subkey name
    DWORD    cbName;                  // size of name string
    TCHAR    achClass[MAX_PATH] = TEXT("");  // buffer for class name
    DWORD    cchClassName = MAX_PATH;  // size of class string
    DWORD    cSubKeys=0;              // number of subkeys
    DWORD    cbMaxSubKey;              // longest subkey size
    DWORD    cchMaxClass;              // longest class string
    DWORD    cValues;              // number of values for key
    DWORD    cchMaxValue;          // longest value name
    DWORD    cbMaxValueData;      // longest value data
    DWORD    cbSecurityDescriptor; // size of security descriptor
    FILETIME ftLastWriteTime;      // last write time
 
    DWORD i, retCode;
 
    TCHAR  achValue[MAX_VALUE_NAME];
    DWORD cchValue = MAX_VALUE_NAME;
 
    // Get the class name and the value count.
    retCode = RegQueryInfoKey(
        hKey,                    // key handle
        achClass,                // buffer for class name
        &cchClassName,          // size of class string
        NULL,                    // reserved
        &cSubKeys,              // number of subkeys
        &cbMaxSubKey,            // longest subkey size
        &cchMaxClass,            // longest class string
        &cValues,                // number of values for this key
        &cchMaxValue,            // longest value name
        &cbMaxValueData,        // longest value data
        &cbSecurityDescriptor,  // security descriptor
        &ftLastWriteTime);      // last write time
 
    // Enumerate the subkeys, until RegEnumKeyEx fails.
   
    if (cSubKeys)
    {
        printf( "\nNumber of subkeys: %d\n", cSubKeys);
                if(cSubKeys!=0)
        for (i=0; i<cSubKeys; i++)
        {
            cbName = MAX_KEY_LENGTH;
            retCode = RegEnumKeyEx(hKey, i,
                    achKey,
                    &cbName,
                    NULL,
                    NULL,
                    NULL,
                    &ftLastWriteTime);
            if (retCode == ERROR_SUCCESS)
            {
                _tprintf(TEXT("(%d) %s\n"), i+1, achKey);

            }
                //Here write a recursive function to loop through the subkeys
        }
   
        }
        else
        {
                printf("This is a child\n");
        }
 
    // Enumerate the key values.

    }
}
]]> C++ rag84dec http://forums.devx.com/showthread.php?t=173377 Execute Command As Administrator http://forums.devx.com/showthread.php?t=173370&goto=newpost Fri, 13 Nov 2009 21:26:04 GMT Okay, so I have to execute a batch command on a restricted user's account, however the batch command will not work unless the process has Administrative Privileges.

currently i call the batch command via
Code:
system("command here");
I, as the programmer, know the Administrator user/password on the WinXP machine this is to be executed on.

How can i execute this command/program as an administrator? I'm thinking about using the
SetThreadToken() function (http://msdn.microsoft.com/en-us/libr...8VS.85%29.aspx) but I do not know how to construct the token object properly

Thanks,
Philly0494 ]]> C++ philly0494 http://forums.devx.com/showthread.php?t=173370 Mind block: temp object destruction http://forums.devx.com/showthread.php?t=173368&goto=newpost Fri, 13 Nov 2009 18:41:17 GMT I've got a case where I want a class to be used only as a temporary object which completes the action at destruction. (For "complete" think "transmits itself").

So, when is a temporary object destroyed?
Code:
{
    TempClass() << "Stuff"; // here?
    ...
} // here?
]]> C++ hendrixj http://forums.devx.com/showthread.php?t=173368 How to Combine Hexadecimal Numbers http://forums.devx.com/showthread.php?t=173357&goto=newpost Thu, 12 Nov 2009 03:48:38 GMT Hello How do I combine hexadecimal numbers? For example if I have the numbers: - aa - 14 - 5d How can I combine them to get : aa145d ? Hello

How do I combine hexadecimal numbers? For example if I have the numbers:

- aa
- 14
- 5d

How can I combine them to get : aa145d ? ]]> C++ gretty http://forums.devx.com/showthread.php?t=173357 Adding to vector http://forums.devx.com/showthread.php?t=173343&goto=newpost Mon, 09 Nov 2009 23:40:28 GMT #include #include #include #include #include #include using namespace std; vector SplitString (string aString) { vector vec; char * cstr, *p; //string str ("Please split this phrase into tokens"); string str = aString; cstr = new char [str.size()+1]; strcpy (cstr, str.c_str()); // cstr now contains a c-string copy of str p=strtok (cstr," "); while (p!=NULL) { vec.push_back(p); p=strtok(NULL," "); } delete[] cstr; return vec; } std::vector SplitOnPunct(std::string const& str,std::string const& punct ) { std::vector vec1; if (str.length() == 0) return vec1; std::string::size_type pos, end; for (pos = 0; pos != std::string::npos; pos = end) { end = str.find_first_of(punct, pos); if (end == pos && ++end == str.size()) end = std::string::npos; vec1.push_back(str.substr(pos, end - pos)); } return vec1; } int main() { int i; int b=0; vector vec1; string line,com; ifstream myFile("scan.cm"); if (! myFile) { std::cout << "Error opening output fle" << endl; return -1; } while( getline( myFile, line ) ) { b++; //check if the current line is a comment if(line[0] =='/' && line[1] == '*') continue; if(line[0] =='*') continue; if(line[0] =='*' && line[1] == '/') continue; if(line.empty()) continue; size_t pos; com = "//"; pos= line.find(com); if(pos != string::npos) { int len = line.size(); line.erase(pos, (len-pos)); } std::vector vec = SplitString(line); for (std::vector::size_type a = 0; a < vec.size(); ++a) { cout << vec.at(a) << endl; //outputs all words in vector // this is where i call the function to split the word and it should add to another vector std::vector vec1 = SplitOnPunct(vec.at(a), "+-*/<>{()};,"); } std::cout << "LINE: " << b << endl; cout << vec1.size() << endl; //outputs 0 } myFile.close(); return 0; } --------- ]]> I've written some code that reads in a file line by line, splits all lines into words and adds the words to a vector.

I need to call my function that splits a word with puncatutation into serarate tokens and add them to a vector so for example a word like they're would be split into:

Quote:
they
'
re
I can split the line into words but the function call i don't think is working as the vector is empty

Code:
#include <fstream>
#include <iostream>
#include <vector>
#include <cstring>
#include <string>
#include <sstream>
#include <stdio.h>

using namespace std;

vector<string> SplitString (string aString)
{
        vector<string> vec;
        char * cstr, *p;
       
        //string str ("Please split this phrase into tokens");
       
        string str = aString;
       
        cstr = new char [str.size()+1];
        strcpy (cstr, str.c_str());
       
        // cstr now contains a c-string copy of str
       
        p=strtok (cstr," ");
        while (p!=NULL)
        {
        vec.push_back(p);
        p=strtok(NULL," ");
        }
       
        delete[] cstr;
        return vec;
}

std::vector<std::string> SplitOnPunct(std::string const& str,std::string const& punct )
{
    std::vector<std::string> vec1;

    if (str.length() == 0) return vec1;

    std::string::size_type pos, end;

    for (pos = 0; pos != std::string::npos; pos = end)
    {
        end = str.find_first_of(punct, pos);

        if (end == pos && ++end == str.size()) end = std::string::npos;

        vec1.push_back(str.substr(pos, end - pos));
    }

    return vec1;
}

int main()
{
        int i;
        int b=0;
        vector <string> vec1;
       
        string line,com;
       
        ifstream myFile("scan.cm");
       
        if (! myFile)
        {
                std::cout << "Error opening output fle"  << endl;
                return -1;
        }
       
        while( getline( myFile, line ) )
        {
                b++;
               
                //check if the current line is a comment
                if(line[0] =='/' && line[1] == '*')
                        continue;
                if(line[0] =='*')
                        continue;
                if(line[0] =='*' && line[1] == '/')
                        continue;
                if(line.empty())
                        continue;
               
                size_t pos;
                com = "//";
       
                pos= line.find(com);
                                               
                if(pos != string::npos)
                {
                        int len = line.size();
                       
                        line.erase(pos, (len-pos));
                }
       
                std::vector<std::string> vec = SplitString(line);
               
                for (std::vector<std::string>::size_type a = 0; a < vec.size(); ++a)
                {
                        cout << vec.at(a) << endl; //outputs all words in vector
                       
                        // this is where i call the function to split the word and it should add to another vector
                        std::vector<std::string> vec1 = SplitOnPunct(vec.at(a), "+-*/<>{()};,");
                }
               
                std::cout << "LINE: " << b << endl;
               
                cout << vec1.size() << endl; //outputs 0
               
        }

        myFile.close();

        return 0;
}
]]> C++ AdRock http://forums.devx.com/showthread.php?t=173343 <![CDATA[Can't catch this exception]]> http://forums.devx.com/showthread.php?t=173336&goto=newpost Mon, 09 Nov 2009 11:50:46 GMT Hi,

I am getting an unhandled exception in some code that I'm working on. I have put a try... catch(...) around the code but I still get an unhandeled exception message pop up (this is on Windows with Visual Studio 2008).

Using the debugger I get -

Unhandled exception at 0xblahblah in fred.exe: 0xC0000005: Access violation reading location 0x00000000.

Looking up the stack trace to the function where I'm tryring to catch it, the debugger shows I'm within the try section.

Why can't I catch it?

Thanks.

Peter. ]]> C++ PeterS2 http://forums.devx.com/showthread.php?t=173336 Skipping rest of line on comment http://forums.devx.com/showthread.php?t=173333&goto=newpost Sun, 08 Nov 2009 23:27:13 GMT > value) { //check if the current line is a comment if(line[0] =='/' && line[1] == '*') continue; else if(line[0] =='*') continue; else if(line[0] =='*' && line[1] == '/') continue; //this is where i need to do a check while(!value.find_first_of("//",0)) { //Do code here } } } --------- ]]> I need help with a section of code.

I am reading a file which i want to skip comments. I can skip comments which start with /* etc but i need to skip comments that start with //

This is ok if the comments sart at the beginning of the line but if they are half way through the line it causes a problem.

what it does is add to a vector each word of a string so i want it to read the line, add each word to a vector until it reaches a //

I can add to the vector fine but i need to be able to skip the line once it reaches a //

Code:
while( getline( myFile, line ) )
{               
        string value;
        istringstream iss(line);
        std::ostringstream p;
       
        while (iss >> value)
        {       
                //check if the current line is a comment
                if(line[0] =='/' && line[1] == '*')
                        continue;
                else if(line[0] =='*')
                        continue;
                else if(line[0] =='*' && line[1] == '/')
                        continue;
               
                //this is where i need to do a check
                while(!value.find_first_of("//",0))
                {
                        //Do code here
                }
        }
}
]]> C++ AdRock http://forums.devx.com/showthread.php?t=173333 String as name http://forums.devx.com/showthread.php?t=173330&goto=newpost Sun, 08 Nov 2009 02:08:28 GMT Hi, just had a quick question:

If I defined a string: char a[] = "Hello";

And then I defined an integer: int b = 5;

How could I define an integer whose name was the string a, without directly doing int Hello = 5, but instead using a.

Thanks for this! ]]> C++ ah605 http://forums.devx.com/showthread.php?t=173330 Getting string out of a 2D vector into a string variable http://forums.devx.com/showthread.php?t=173328&goto=newpost Sat, 07 Nov 2009 15:21:50 GMT > :: size_type i = 0, size = info.size(); i < size; ++i) { for ( vector < string > :: size_type j = 0, length = info[i].size(); j < length; ++j) { //check to see if the inner vectors are empty if(info[i].size() > 1) //std::string strd = info[i][j].at(j); //cout< I have a 2D vector and I need to assign each value of the inner vector to a string.

I am having problems getting what is in the vector into a string variable

If anyone could please help I would be very happy as I can't fix this problem

Code:
for ( vector< vector< string > > :: size_type i = 0, size = info.size(); i < size; ++i)
{
        for ( vector < string > :: size_type j = 0, length = info[i].size(); j < length; ++j)
        {
                //check to see if the inner vectors are empty
                if(info[i].size() > 1)
                       
                        //std::string strd = info[i][j].at(j);
                        //cout<<strd.c_str()<<endl;
                        //if(strd == "int") {cout << "INT: ";}
                        cout << info[i][j] << endl;
        }
        cout << endl;
}
]]> C++ AdRock http://forums.devx.com/showthread.php?t=173328 how to store data in a folder http://forums.devx.com/showthread.php?t=173327&goto=newpost Sat, 07 Nov 2009 10:09:09 GMT hi..i am writng a program.....i have collected a lot of information(name,hobbies etc.....) of about a hundred students in my school.......i have also stored their photographs in .jpeg format.........i am using Dev c++ and windows xp..........i want to store all this info + photos in a single file....how do i go about it............i started programmin a few days ago......so whatever u explain...please explain it in lay mans terms..........i dont want the entire code....but parts of the code ....it wud be great if you could explain it a bit n could give sources for me study it in greater detail hi..i am writng a program.....i have collected a lot of information(name,hobbies etc.....) of about a hundred students in my school.......i have also stored their photographs in .jpeg format.........i am using Dev c++ and windows xp..........i want to store all this info + photos in a single file....how do i go about it............i started programmin a few days ago......so whatever u explain...please explain it in lay mans terms..........i dont want the entire code....but parts of the code ....it wud be great if you could explain it a bit n could give sources for me study it in greater detail ]]> C++ karanmehra18 http://forums.devx.com/showthread.php?t=173327 NTFS Change Journals http://forums.devx.com/showthread.php?t=173320&goto=newpost Fri, 06 Nov 2009 09:24:31 GMT Hi,

I am new to Windows related Code in C++.

Currently, I wish to monitor my system for the modified files using NTFS Change Journals. I tried to query the Journal data (using DeviceIOControl) and get the modified file details. I need some clarifications regarding the below things.

1. Is there a way to search notifications for particular folder (say only My Documents and My Pictures) or particular fileTypes (say jpg, doc, etc).
2. Is there a way to search only recent modifications (say for the past 1 day or 5 hrs, etc)
3. If my application create journal for a volume and stopped means, then in the next time when it restarted can I monitor the changes during the period when my application was not running. (I tried it , seems I can't do it).
4. If I modify a file present under 'D:/Testing/Test.txt', it seems the usn_record 'ParentFileReferenceNumber' is for D: and the 'FileReferenceNumber' is for the particular file 'Test.txt'. But what I think is the 'ParentFileReferenceNumber' should be for 'D:/Testing' and the 'FileReferenceNumber' should be for 'Test.txt'. For this, I have made CreateFile() for the '\\.\D:' location. Am I do anything wrong.
5. Shall I use fsutil for my purpose.

Could any one please clarify my queries and point me in a correct direction. Also, if possible, please poing me a releveant help document or URL to further proceed.

Thanks in Advance.

Regards,
Shar. ]]> C++ Shar http://forums.devx.com/showthread.php?t=173320 How to get the representation of ASCII Charcters from a String Array? http://forums.devx.com/showthread.php?t=173311&goto=newpost Thu, 05 Nov 2009 09:34:40 GMT Dear programmer,

I am searching for a way to get the ASCII character representation from a string array. I am doing a project on stacks.

An example:[u]

Code:

string *myArray;
myArray = new string[arraySize];
*Now the above string array consists of characters (e.g: myArray[0] = 1, myArray[1] = *, myArray[2] = 45...etc).

The idea is get the ASCII code of those characters that are stored in the string array.

Code:

int( myArray[0] ); //Will not work as it is an invalid cast.
*If any one can provide me of any ideas, i would be grateful... I am a beginner-to-intermediate C++ programmer. biggrin.gif

Thanks for reading,
My Regards ]]> C++ c-ray http://forums.devx.com/showthread.php?t=173311