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On the first page of CP, Most Popular->• Three Ways to Inject Your Code into... , In that he explained how to Change the WinProc....(This is only the place where you can fool the application , by hacing WinProc)i.e when u press keyboard, you can change the stuff, ...I guess you will run that code.
regards
Balkrishna Talele
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Look http://www.codeguru.com/Cpp/W-P/system/keyboard/article.php/c5699/
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hi
i have an STL string object, which has a NULL char in the MIDDLE. For ex:
#include<string>
using namespace std;
....
string str = "abcdefghijklmnopqrstuvwxyz";
str[11] = 0; // str.size() still equals 26
Now i want to convert this string to _bstr_t object, retaining the NULL char and the chars after that. I tried this:
_bstr_t bstr = str.c_str();
But only first 11 chars are being copied(till NULL char). Pls help
TIA
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A string containig a \0 in the middle is not a string in any c-derived language. You are probably better off in not trying to pretend that it is one.
Make your string a vector of bytes, and it can happily contain as many \0 as you need.
What are you trying to achieve? Maybe stepping back and taking the time to describe your problem in words will help you to find a new approach to its solution.
Sandeep Kulkarni wrote:
str[11] = 0; _bstr_t bstr = str.c_str();
But only first 11 chars are being copied(till NULL char).
Any other behaviour would be a clear violation of guarantees given by the std::string. \0 is a string terminator.
"We trained hard, but it seemed that every time we were beginning to form up into teams we would be reorganised. I was to learn later in life that we tend to meet any new situation by reorganising: and a wonderful method it can be for creating the illusion of progress, while producing confusion, inefficiency and demoralisation."
-- Caius Petronius, Roman Consul, 66 A.D.
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Actually the scenario is a bit different. I have a string, which needs to be encrypted first, then be supplied to another component. While encrypting a "valid" string, there is every possibility(perhaps there is!) that some of the chars be substituted by NULL char. THIS IS VERY MUCH ALLOWED HERE!!!
Now such an encrypted string needs to be passed to a method of a COM component which accepts nothing other than _bstr_t !!! Hence the problem!!
Thanx anyway,More help will be appreciated.
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So you can't change the code of the COMponent?
And the way of encryption you need to use is also fixed?
Too bad.
bstr_t is holding strings in UNICODE encoding, and constructors and operators that take char* are converting the strings to Unicode.
Unicode strings sould be resistant to a single \0, as they are only terminated by \0\0.
Maybe you can assemble the bstr_t from your string by adding the part until the first \0, then subsequently +=ing the \0, the part until the next \0, the next \0 and so on?
Try it out.
Sorry that I am of no help here.
"We trained hard, but it seemed that every time we were beginning to form up into teams we would be reorganised. I was to learn later in life that we tend to meet any new situation by reorganising: and a wonderful method it can be for creating the illusion of progress, while producing confusion, inefficiency and demoralisation."
-- Caius Petronius, Roman Consul, 66 A.D.
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I am curious if anyone know of a good tutorial to learn how to make a SIMPLE client server program. All I wish to do is make a server listen on a port on my local network and a client be on all the computers of the network. What i wish to do hopefully is allow the clients to send a message to the server with various messages like "Computer user needs help" or whatever. I have seen some examples on the net but the code is simply just given and not explained and unfortunately for me I don't have enough knowledge with the winapi yet to fully understand what alot of the functions mean. I tutorial using mfc would be great. Or code that is portable to a mfc program. Your help is gratefully appreciated.I know there are programs like WinChat and Netsend and so on but thats beside the point.
Win32newb
"Making windows programs worse than they already are"
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use the following smaple code...Create WIn32 console and paste the server.c in one project and client.c in another win32 copnsole project
// Module Name: Server.c
//
// Description:
// This example illustrates a simple TCP server that accepts
// incoming client connections. Once a client connection is
// established, a thread is spawned to read data from the
// client and echo it back (if the echo option is not
// disabled).
//
// Compile:
// cl -o Server Server.c ws2_32.lib
//
// Command line options:
// server [-p:x] [-i:IP] [-o]
// -p:x Port number to listen on
// -i:str Interface to listen on
// -o Receive only; don't echo the data back
//
#include <winsock2.h>
#include <stdio.h>
#include <stdlib.h>
#define DEFAULT_PORT 5150
#define DEFAULT_BUFFER 4096
int iPort = DEFAULT_PORT; // Port to listen for clients on
BOOL bInterface = FALSE, // Listen on the specified interface
bRecvOnly = FALSE; // Receive data only; don't echo back
char szAddress[128]; // Interface to listen for clients on
//
// Function: usage
//
// Description:
// Print usage information and exit
//
void usage()
{
printf("usage: server [-p:x] [-i:IP] [-o]\n\n");
printf(" -p:x Port number to listen on\n");
printf(" -i:str Interface to listen on\n");
printf(" -o Don't echo the data back\n\n");
ExitProcess(1);
}
//
// Function: ValidateArgs
//
// Description:
// Parse the command line arguments, and set some global flags
// to indicate what actions to perform
//
void ValidateArgs(int argc, char **argv)
{
int i;
for(i = 1; i < argc; i++)
{
if ((argv[i][0] == '-') || (argv[i][0] == '/'))
{
switch (tolower(argv[i][1]))
{
case 'p':
iPort = atoi(&argv[i][3]);
break;
case 'i':
bInterface = TRUE;
if (strlen(argv[i]) > 3)
strcpy(szAddress, &argv[i][3]);
break;
case 'o':
bRecvOnly = TRUE;
break;
default:
usage();
break;
}
}
}
}
//
// Function: ClientThread
//
// Description:
// This function is called as a thread, and it handles a given
// client connection. The parameter passed in is the socket
// handle returned from an accept() call. This function reads
// data from the client and writes it back.
//
DWORD WINAPI ClientThread(LPVOID lpParam)
{
SOCKET sock=(SOCKET)lpParam;
char szBuff[DEFAULT_BUFFER];
int ret,
nLeft,
idx;
while(1)
{
// Perform a blocking recv() call
//
ret = recv(sock, szBuff, DEFAULT_BUFFER, 0);
if (ret == 0) // Graceful close
break;
else if (ret == SOCKET_ERROR)
{
printf("recv() failed: %d\n", WSAGetLastError());
break;
}
szBuff[ret] = '\0';
printf("RECV: '%s'\n", szBuff);
//
// If we selected to echo the data back, do it
//
if (!bRecvOnly)
{
nLeft = ret;
idx = 0;
//
// Make sure we write all the data
//
while(nLeft > 0)
{
ret = send(sock, &szBuff[idx], nLeft, 0);
if (ret == 0)
break;
else if (ret == SOCKET_ERROR)
{
printf("send() failed: %d\n",
WSAGetLastError());
break;
}
nLeft -= ret;
idx += ret;
}
}
}
return 0;
}
//
// Function: main
//
// Description:
// Main thread of execution. Initialize Winsock, parse the
// command line arguments, create the listening socket, bind
// to the local address, and wait for client connections.
//
int main(int argc, char **argv)
{
WSADATA wsd;
SOCKET sListen,
sClient;
int iAddrSize;
HANDLE hThread;
DWORD dwThreadId;
struct sockaddr_in local,
client;
ValidateArgs(argc, argv);
if (WSAStartup(MAKEWORD(2,2), &wsd) != 0)
{
printf("Failed to load Winsock!\n");
return 1;
}
// Create our listening socket
//
sListen = socket(AF_INET, SOCK_STREAM, IPPROTO_IP);
if (sListen == SOCKET_ERROR)
{
printf("socket() failed: %d\n", WSAGetLastError());
return 1;
}
// Select the local interface, and bind to it
//
if (bInterface)
{
local.sin_addr.s_addr = inet_addr(szAddress);
if (local.sin_addr.s_addr == INADDR_NONE)
usage();
}
else
local.sin_addr.s_addr = htonl(INADDR_ANY);
local.sin_family = AF_INET;
local.sin_port = htons(iPort);
if (bind(sListen, (struct sockaddr *)&local,
sizeof(local)) == SOCKET_ERROR)
{
printf("bind() failed: %d\n", WSAGetLastError());
return 1;
}
listen(sListen, 8);
//
// In a continuous loop, wait for incoming clients. Once one
// is detected, create a thread and pass the handle off to it.
//
while (1)
{
iAddrSize = sizeof(client);
sClient = accept(sListen, (struct sockaddr *)&client,
&iAddrSize);
if (sClient == INVALID_SOCKET)
{
printf("accept() failed: %d\n", WSAGetLastError());
break;
}
printf("Accepted client: %s:%d\n",
inet_ntoa(client.sin_addr), ntohs(client.sin_port));
hThread = CreateThread(NULL, 0, ClientThread,
(LPVOID)sClient, 0, &dwThreadId);
if (hThread == NULL)
{
printf("CreateThread() failed: %d\n", GetLastError());
break;
}
CloseHandle(hThread);
}
closesocket(sListen);
WSACleanup();
return 0;
}
--------------------------------------------------------------------------
//Now paste Client.c in Another Project
// Module Name: Client.c
//
// Description:
// This sample is the echo client. It connects to the TCP server,
// sends data, and reads data back from the server.
//
// Compile:
// cl -o Client Client.c ws2_32.lib
//
// Command Line Options:
// client [-p:x] [-s:IP] [-n:x] [-o]
// -p:x Remote port to send to
// -s:IP Server's IP address or host name
// -n:x Number of times to send message
// -o Send messages only; don't receive
//
#include <winsock2.h>
#include <stdio.h>
#include <stdlib.h>
#define DEFAULT_COUNT 20
#define DEFAULT_PORT 5150
#define DEFAULT_BUFFER 2048
#define DEFAULT_MESSAGE "This is a test of the emergency \
broadcasting system"
char szServer[128], // Server to connect to
szMessage[1024]; // Message to send to sever
int iPort = DEFAULT_PORT; // Port on server to connect to
DWORD dwCount = DEFAULT_COUNT; // Number of times to send message
BOOL bSendOnly = FALSE; // Send data only; don't receive
//
// Function: usage:
//
// Description:
// Print usage information and exit
//
void usage()
{
printf("usage: client [-p:x] [-s:IP] [-n:x] [-o]\n\n");
printf(" -p:x Remote port to send to\n");
printf(" -s:IP Server's IP address or host name\n");
printf(" -n:x Number of times to send message\n");
printf(" -o Send messages only; don't receive\n");
ExitProcess(1);
}
//
// Function: ValidateArgs
//
// Description:
// Parse the command line arguments, and set some global flags
// to indicate what actions to perform
//
void ValidateArgs(int argc, char **argv)
{
int i;
for(i = 1; i < argc; i++)
{
if ((argv[i][0] == '-') || (argv[i][0] == '/'))
{
switch (tolower(argv[i][1]))
{
case 'p': // Remote port
if (strlen(argv[i]) > 3)
iPort = atoi(&argv[i][3]);
break;
case 's': // Server
if (strlen(argv[i]) > 3)
strcpy(szServer, &argv[i][3]);
break;
case 'n': // Number of times to send message
if (strlen(argv[i]) > 3)
dwCount = atol(&argv[i][3]);
break;
case 'o': // Only send message; don't receive
bSendOnly = TRUE;
break;
default:
usage();
break;
}
}
}
}
//
// Function: main
//
// Description:
// Main thread of execution. Initialize Winsock, parse the
// command line arguments, create a socket, connect to the
// server, and then send and receive data
//
int main(int argc, char **argv)
{
WSADATA wsd;
SOCKET sClient;
char szBuffer[DEFAULT_BUFFER];
int ret,
i;
struct sockaddr_in server;
struct hostent *host = NULL;
// Parse the command line, and load Winsock
//
ValidateArgs(argc, argv);
if (WSAStartup(MAKEWORD(2,2), &wsd) != 0)
{
printf("Failed to load Winsock library!\n");
return 1;
}
strcpy(szMessage, DEFAULT_MESSAGE);
//
// Create the socket, and attempt to connect to the server
//
sClient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sClient == INVALID_SOCKET)
{
printf("socket() failed: %d\n", WSAGetLastError());
return 1;
}
server.sin_family = AF_INET;
server.sin_port = htons(iPort);
server.sin_addr.s_addr = inet_addr(szServer);
//
// If the supplied server address wasn't in the form
// "aaa.bbb.ccc.ddd," it's a host name, so try to resolve it
//
if (server.sin_addr.s_addr == INADDR_NONE)
{
host = gethostbyname(szServer);
if (host == NULL)
{
printf("Unable to resolve server: %s\n", szServer);
return 1;
}
CopyMemory(&server.sin_addr, host->h_addr_list[0],
host->h_length);
}
if (connect(sClient, (struct sockaddr *)&server,
sizeof(server)) == SOCKET_ERROR)
{
printf("connect() failed: %d\n", WSAGetLastError());
return 1;
}
// Send and receive data
//
for(i = 0; i < dwCount; i++)
{
ret = send(sClient, szMessage, strlen(szMessage), 0);
if (ret == 0)
break;
else if (ret == SOCKET_ERROR)
{
printf("send() failed: %d\n", WSAGetLastError());
break;
}
printf("Send %d bytes\n", ret);
if (!bSendOnly)
{
ret = recv(sClient, szBuffer, DEFAULT_BUFFER, 0);
if (ret == 0) // Graceful close
break;
else if (ret == SOCKET_ERROR)
{
printf("recv() failed: %d\n", WSAGetLastError());
break;
}
szBuffer[ret] = '\0';
printf("RECV [%d bytes]: '%s'\n", ret, szBuffer);
}
}
closesocket(sClient);
WSACleanup();
return 0;
}
--------------------------------------------------------------------------
How to Run them
for server usage is
server -p:5150 -o
and for client the usage is
client -p:5150 -s:IP -n:10 -o
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thanks for the reply. One question what headers are needed for the includes? you didn't turn the <> function on in your post so it wiped out the includes.
Thanks again,
Win32newb
"Making windows programs worse than they already are"
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Can any body tell me how to completely automate the build of a vc++ project from command line.I want to export makefiles automatically and build it.It's urgent.
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Can nobody answer me?Is it because it's a dumb question?I'm a fresher.I would be grate ful to you,if anybody helps me.
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This article[^] in the MSDN describes the command line switches for VS.NET 2002/2003. You can use these to build projects or whole solutions from the command line or in a batch file.
If you are still using Visual C++ 6.0, there are similar command line options for it; you'll need to check the help text.
Software Zen: delete this;
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Hi,
I am new in MFC window based application.
I have created a SDI project(based on document view architecture) using MFC wizard. I want to remove menu bar and title bar completely. How can I do that?
Advance thanks for support.
Shoma
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In the dialog design view, right click on the dialog and select properties, there are checkbox where you can remove the titlebar.
MSN Messenger.
prakashnadar@msn.com
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Hello,
That chap is asking about SDI Application and not Dialog based application...dont confuse him....
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Sorry for the wrong answer before here what you need to do, in the mainframe window, add the virtual funtion for PreCreateWindow(..) if it is already there then in that method the paramter CREATESTRUCT has a member variable called dwExStyle. if you modify the style here you will get the corresponding style of your window.
MSN Messenger.
prakashnadar@msn.com
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BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs)
{
cs.style = WS_DLGFRAME | ~WS_BORDER | WS_OVERLAPPED ;
cs.hMenu = NULL;
// Create a window without min/max buttons or sizable border
// cs.style = WS_OVERLAPPED ;
return CFrameWnd::PreCreateWindow(cs);
}
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Balkrishna Talele wrote:
cs.style = WS_DLGFRAME | ~WS_BORDER | WS_OVERLAPPED ;
most of the bits will be set.
MSN Messenger.
prakashnadar@msn.com
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I am using MFC and am having a bit of a problem with accessing a control in a generic class I created. I am using FormView as it has both dialog and menus in it. This may be a simple problem, but I am still new to MFC and I can't seem to figure it out.
I created a formview class with an edit box, then subclassed the edit box so I could trap the enter key. Now, I need to access a list box on the form from a generic class that I created. I know I need to create a pointer to the formview class, but I am unsure as to how to do this or how to access the list box control variable. I tried using getparent() as in:
(CFormView*)GetParentOwner()->GetDlgItemText(IDD_ITEMSLIST, model);
and could not access the control. I get errors saying the control is an undeclared variable. Any help or a web site that explains this would be greatly appreciated.
Roger
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MFC creates automatic class hiearchies, and has a set of functions that allow you to traverse and manipuate the hiearchy.
Consider the following example:
1. An application object is created
2. The application object creates and initializes it's main window (usually a frame window), and saves this into m_pMainWnd pointer on the CWinApp-class
3. The frame window, if it is an SDI frame, first creates a set of possible bars (toolbar, statusbar, menubar, rebar etc). Then it creates the view context, and places itself as a parent of the view.
This having said, you can find the form view class object by asking the frame window to enumerate through it's child windows. Alternatively, you can use GetDlgCtrl with the ID of the child window (by default, AFX_IDW_PANE_FIRST, unless you have given it a different ID while creating it). Here is what MSDN says about the function call:
You can use the GetDlgItem function with any parent-child window pair, not just with dialog boxes. As long as the hDlg parameter specifies a parent window and the child window has a unique identifier (as specified by the hMenu parameter in the CreateWindow or CreateWindowEx function that created the child window), GetDlgItem returns a valid handle to the child window
As you can see, the MFC implementation of this function always returns a CWnd* to the requested object. Now, when you ask for the view class pointer, you can cast it down from CWnd* to CFormView*. Again, by using this pointer, you can use GetDlgCtrl to request for a pointer into the CListCtrl object.
The reason why your code call fails is that although the form view is a child of the frame window, the list box control is NOT. It is the child of the form view. You need to use a pointer to the form view class instance if you wish to request for the listbox.
-Antti Keskinen
----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.
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I don't suppose you could show me how to do this. I tried using CFormView* pDiag = (CFormView*)GetParentView()->GetDlgItem(IDC_DATA),
but it still does not give me access to my ListBox and I cannot insert data into it since I cannot access the control variable on my viewform. I know I am being a bit dense here, but this is still new to me. If I was dealing with just a console based Application I probably would not have as much trouble, but I don't really know how to do this in MFC and the explanations I have read so far have not really shed any light on how I need to do this other than I now know I need to create a pointer which is what I am having trouble with at the moment.
Roger
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Hello Friends !!
i am developing a sdi application..on that i am using two CListView Classes and swithching between them when needed ..
i want to display a dialog box while one of the two view is selected ..i don't know where to write the code .. i tried using OnviewActivate handler it's not working ..so if any body knows pls help to which handler to choose ,, and also
pls explain me in which order message handlers are called ..
Thanks in advance
"The thought that Guids ur intelligence in more important than how intelligent u r  "
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Hello !
First I need to ask you the simplest of all questions: what do you use to switch between the views ? If it is a button or anything that accepts messages, write a handler for it and create/show a modeless dialog box when a click on this item designates that the "view with the dialog" should be shown. When a click on the item occurs that says "show the other view", you command the modeless dialog to either hide itself or destroy it.
The message order is dependant on the phase of your window object. Usually, different events on the Windows OS can be grouped by the messages sent. The only reasonable way to track the message order on a window is to use Microsoft Spy++, or a similar message hooking program.
-Antti Keskinen
----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.
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Thanks a Lot i got it
"The thought that Guids ur intelligence in more important than how intelligent u r "
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Can anybody tell me how can i call the member function of one class through the other class using Send/Post Message?
Vidya
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