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There is an article on this site called Undocument VC++ or something similar that describes some of the issues you're trying to deal with.
It's not easy, and it's a major hack.
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hi does anyone has a sample code on screen capture which is a procedure which captures the screen of any active running window. Thanks for helping
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hi does anyone has a sample code on screen capture which is a procedure which captures the screen of any active running window. Thanks for helping
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http://support.microsoft.com/support/kb/articles/Q186/7/36.ASP
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Hello,
I'm new to VC++ and struggling with doing something that should be fairly simple.
I have two projects in my workspace, proj1 and proj2. Proj2 has UNICODE and non-Unicode builds, and
debug and release versions of both. Proj1 only has Debug and Release.
What I want to do is say, when building proj2 UNICODE Debug, make sure that proj1 *Debug* is built.
VC++ isn't letting me do this. It always builds the Release version of proj1, no matter what. How do I
tell it what configuration to depend on?
Thanks,
Alex
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Hmmm... this shouldn't be happening.
I took an existing dsw with a couple of projects, and set a dependency of one project (Pro1) to another (NewSMTPSample) - as shown here in the exported make file:
!IF "$(CFG)" == "Pro1 - Win32 Release"
"NewSMTPSample - Win32 Release" :
cd "\Develop(Tim)\NewSMTPSample"
$(MAKE) /$(MAKEFLAGS) /F ".\NewSMTPSample.mak" CFG="NewSMTPSample - Win32 Release"
cd "..\Pro1"
"NewSMTPSample - Win32 ReleaseCLEAN" :
cd "\Develop(Tim)\NewSMTPSample"
$(MAKE) /$(MAKEFLAGS) /F ".\NewSMTPSample.mak" CFG="NewSMTPSample - Win32 Release" RECURSE=1 CLEAN
cd "..\Pro1"
!ELSEIF "$(CFG)" == "Pro1 - Win32 Debug"
"NewSMTPSample - Win32 Debug" :
cd "\Develop(Tim)\NewSMTPSample"
$(MAKE) /$(MAKEFLAGS) /F ".\NewSMTPSample.mak" CFG="NewSMTPSample - Win32 Debug"
cd "..\Pro1"
"NewSMTPSample - Win32 DebugCLEAN" :
cd "\Develop(Tim)\NewSMTPSample"
$(MAKE) /$(MAKEFLAGS) /F ".\NewSMTPSample.mak" CFG="NewSMTPSample - Win32 Debug" RECURSE=1 CLEAN
cd "..\Pro1"
!ENDIF
As you can see, it should detect the build settings and select the corresponding build of the dependency. I suspect its because there is no UNICODE build that things get messed up. Export the makefile and have a look. You can probably edit it to achieve the desired results.
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does anyone has a sample code on timer which allows you to call any procedure you want to call say, every 30 ms ? Thanks for helping
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VOID CALLBACK TimerProc(
HWND hwnd, // handle to window
UINT uMsg, // WM_TIMER message
UINT_PTR idEvent, // timer identifier
DWORD dwTime // current system time
)
{
..................
}
// Set timer
SetTimer(hwnd, // handle to main window
IDT_TIMER1, // timer identifier
30, // 30ms interval
(TIMERPROC) MyTimerProc); // timer callback
// Delete timer
BOOL KillTimer(
HWND hwnd, // handle to window
UINT_PTR uIDEvent // timer identifier
);
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sorrie I am new to C++ programming and I want to enquire which part of the code am I suppose to insert the procedures I want to call whenever this 30 ms interval is up?
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Standard timers are not very accurate, since they depend on windows messages. If you have a lot of messages in your queue, then timer requests can be delayed.
You're better off using the multimedia timers, which have a much higher resolution than normal timers and are waitable (using WaitFor(Single/Multiple)Object(s)).
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Does someone know how to change the color of a non owner-draw button?
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I don't believe it's possible. I think you have to make it owner draw to change it.
I struggled with this problem myself, and ended up using statics and the WM_CTLCOLOR message and detecting WM_LBUTTONDOWN instead.
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Does someone know how to change the color of a push button, who doesn't have the owner draw style?
Please help me.
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Have you tried looking at the CColorButton class that is posted on here somewhere (just search for the class name). I am using it, acts perfectly except for in one location. The only drawback is having the owner draw property set on the button.
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hi I need to modify the below Spy sample program but dont know how to modify it .Can anyone point out to me what is there to be changed in the Spy sample program because I dont know how to. I need to detect when any running active application refreshes its screen as a result of input from keyboard and mouse and by the way is wm_paint the message I should monitor for my program? I am really desperate because I am very new to c++ programming and I really hope you can help me . Thanks for replying.
/*****************************************************************************\
* hook.c - Windows message spy application dll
*
* Functions:
*
* DllMain()
* FindSpyWindow()
* HookProc()
* SpyGetMsgProc()
* SpyCallWndProc()
* DbgPrintf()
*
* Comments:
*
\*****************************************************************************/
#include <windows.h>
#include "..\hook.h"
PRIVATE HWND ghwndSpyHook = NULL; // the handle back to the spy executable
PRIVATE SPYMSGDATA gsmd;
PRIVATE COPYDATASTRUCT gcds = { 0, sizeof(SPYMSGDATA), &gsmd };
PRIVATE VOID FindSpyWindow(VOID);
#ifdef DBG
VOID DbgPrintf(LPTSTR fmt, ...);
#endif
/*****************************************************************************\
* DllMain (hModule,cbHeap,lpchCmdLine)
*
* Called when the libary is loaded
*
* Arguments:
* PVOID hModule - Module handle for the libary.
* ULONG ulReason - DLL purpose
* PCONTEXT pctx - not used
*
* Returns:
* TRUE - Everything is ok
* FALSE- Error.
\*****************************************************************************/
BOOL
APIENTRY DllMain(
PVOID hModule,
ULONG ulReason,
PCONTEXT pctx
)
{
UNREFERENCED_PARAMETER(hModule);
UNREFERENCED_PARAMETER(pctx);
//
// This function is called for every instance of the DLL. We must find
// and store the handle to the spy window every time an instance of the
// DLL is instantiated.
//
if ( ulReason == DLL_PROCESS_ATTACH ) {
FindSpyWindow();
}
return TRUE;
}
/*****************************************************************************\
* FindSpyWindow
*
* Finds the spy window and store a local copy in this instances data.
* This must be called everytime that a new instance of the DLL is
* created.
*
* Arguments:
* none
*
* Returns:
* VOID
\*****************************************************************************/
PRIVATE VOID
FindSpyWindow(
VOID
)
{
ghwndSpyHook = FindWindow(HOOKWINDOWCLASS, HOOKWINDOWNAME);
}
/*****************************************************************************\
* HookProc( hWnd, uiMessage, wParam, lParam )
*
* The hook proc for the windows hook being spied on
*
* Arguments:
* HWND hWnd - window handle for the parent window
* UINT uiMessage - message number
* WPARAM wParam - message-dependent
* LPARAM lParam - message-dependent
*
* Returns:
* 0 if processed, nonzero if ignored
\*****************************************************************************/
BOOL WINAPI
HookProc(
HWND hwnd,
UINT uiMessage,
WPARAM wParam,
LPARAM lParam
)
{
HWND hwndSpyingOn;
HWND hwndSpyApp;
if (ghwndSpyHook == NULL || !IsWindow(ghwndSpyHook))
{
//
// Spy has terminated. Find the new window.
//
FindSpyWindow();
}
if (ghwndSpyHook != NULL && hwnd != ghwndSpyHook)
{
hwndSpyingOn = (HWND)GetWindowLong(ghwndSpyHook, 0);
hwndSpyApp = (HWND)GetWindowLong(ghwndSpyHook, sizeof(HWND));
//DbgPrintf("H ghwndSpyHook:%8.8x", ghwndSpyHook);
//DbgPrintf("H hwndSpyingOn:%8.8x", hwndSpyingOn);
//DbgPrintf("H hwndSpyApp:%8.8x", hwndSpyApp);
//
// Send the message on asynchronously for Spy to deal with if
// it is the appropriate hwndSpyingOn window to spy on.
//
if (hwndSpyingOn == hwnd
|| (hwndSpyingOn == HWND_ALL && hwnd != hwndSpyApp
&& !IsChild(hwndSpyApp, hwnd)))
{
gsmd.wParam = wParam;
gsmd.lParam = lParam;
gcds.dwData = uiMessage;
//DbgPrintf("H Sending Message hwnd:%8.8x msg:%d", hwnd, uiMessage);
SendMessage(ghwndSpyHook, WM_COPYDATA, (WPARAM)hwnd, (LPARAM)&gcds);
//DbgPrintf("H Sent Message hwnd:%8.8x msg:%d", hwnd, uiMessage);
//DbgPrintf("");
return TRUE;
}
//DbgPrintf("");
}
return FALSE;
}
/*****************************************************************************\
* SpyGetMsgProc
*
* The Get Message hook function.
*
\*****************************************************************************/
LRESULT CALLBACK
SpyGetMsgProc(
INT hc,
WPARAM wParam,
LPARAM lParam
)
{
PMSG pmsg;
pmsg = (PMSG)lParam;
if (hc >= 0 && pmsg && pmsg->hwnd)
{
return HookProc(pmsg->hwnd, pmsg->message, pmsg->wParam, pmsg->lParam);
}
//
// Note that CallNextHookEx ignores the first parameter (hhook) so
// it is acceptable (barely) to pass in a NULL.
//
return CallNextHookEx(NULL, hc, wParam, lParam);
}
/*****************************************************************************\
* SpyCallWndProc
*
* The Call Window Proc (Send Message) hook function.
*
\*****************************************************************************/
LRESULT CALLBACK
SpyCallWndProc(
INT hc,
WPARAM wParam,
LPARAM lParam
)
{
PCWPSTRUCT pcwps;
pcwps = (PCWPSTRUCT)lParam;
if (hc >= 0 && pcwps && pcwps->hwnd)
{
return HookProc(pcwps->hwnd, pcwps->message, pcwps->wParam, pcwps->lParam);
}
//
// Note that CallNextHookEx ignores the first parameter (hhook) so
// it is acceptable (barely) to pass in a NULL.
//
return CallNextHookEx(NULL, hc, wParam, lParam);
}
#ifdef DBG
/****************************************************************************
* DBGprintf
*
* This debugging function prints out a string to the debug output.
* An optional set of substitutional parameters can be specified,
* and the final output will be the processed result of these combined
* with the format string, just like printf. A newline is always
* output after every call to this function.
*
* Arguments:
* LPTSTR fmt - Format string (printf style).
* ... - Variable number of arguments.
* Returns:
* VOID
\****************************************************************************/
VOID DbgPrintf(
LPTSTR fmt,
...
)
{
va_list marker;
TCHAR szBuf[256];
va_start(marker, fmt);
wvsprintf(szBuf, fmt, marker);
va_end(marker);
OutputDebugString(szBuf);
OutputDebugString(TEXT("\r\n"));
}
#endif
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I have following problem:
I Use the Multicolumn ComboBox from Xiao Wu Guang to display some data from a database
(extract data from a table and insert it into the box)
but sometimes happen that two values are the same except the Case
for example
"hello" and "Hello"
in the Drop Down List i see both rows
but if i choose "Hello" the programm automaticle assume i chose "hello" (i think because
"hello" <= "Hello")
please can somebody tell me how i can make a case sensetive seletion???
tnx
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hi,
i have for example a 'vector <object*>' and i have allocated memory for the 'object*' with 'new'.
now i use the clear()-method to clear the vector. have i to use 'delete' before to destroy the 'object*' ?
thx
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Yes. clear() only destroys the contents of the vector, which in this case is just pointers. Destroying the pointer does not destroy the object.
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Hello,
I use Visual C++ and I work with network sockets
(MFC's CAsyncSocket and winapi socket functions).
My application need some data to be sent in
separate TCP packets. In other words I must be
sure that some data are sending immediately and
want to avoid a situation when this data will wait
for the next data to join with them in a single
packet. How can I achieve this? I tried to use
both CAsyncSock::SetSockOpt() method and direct
winapi's setsockopt() call to set TCP_NODELAY
option, but they DON'T WORK, so I see in network
packets analyzer. Any suggestions will be very
appreciated. Thanks in advance.
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As I'm not aware of the overall purpose of your application it's a little hard to be more specific, but here are a few thoughts.
If you want to send single packets you'll have to use UDP not TCP. There is no way to *guarantee* that TCP/IP packets won't be aggregated, either on your machine, or at some other point along the wire. UDP of course doesn't offer guaranteed delivery so you'll have to engineer that functionality yourself.
Here's a snippet from Warren Young's Winsock Programmers FAQ that you might find helpful:
The whole document is found here
>.3.17 - When should I turn off the Nagle algorithm?
Generally, almost never.
Inexperienced Winsockers usually try disabling the Nagle algorithm when they are trying to impose some kind of packet scheme on a TCP data stream. That is, they want to be able to send, say, two packets, one 40 bytes and the other 60, and have the receiver get a 40-byte packet followed by a separate 60-byte packet. (With the Nagle algorithm enabled, TCP will often coalesce these two packets into a single 100 byte packet.) Unfortunately, this is futile, for the following reasons:
Even if the sender manages to send its packets individually, the receiving TCP/IP stack may still coalesce the received packets into a single packet. This can happen any time the sender can send data faster than the receiver can deal with it.
Winsock Layered Service Providers (LSPs) may coalesce or fragment stream data, especially LSPs that modify the data as it passes.
Turning off the Nagle algorithm in a client program will not affect the way that the server sends packets, and vice versa.
Routers and other intermediaries on the network can fragment packets, and there is no guarantee of "proper" reassembly with stream protocols.
If packet arrives that is larger than the available space in the stack's buffers, it may fragment a packet, queuing up as many bytes as it has buffer space for and discarding the rest. (The remote peer will resend the remaining data later.)
Winsock is not required to give you all the data it has queued on a socket even if your recv() call gave Winsock enough buffer space. It may require several calls to get all the data queued on a socket.
Aside from these problems, disabling the Nagle algorithm almost always causes a program's throughput to degrade. The only time you should disable the algorithm is when some other consideration, such as packet timing, is more important than throughput.
Often, programs that deal with real-time user input will disable the Nagle algorithm to achieve the snappiest possible response, at the expense of network bandwidth. Two examples are X Windows servers and multiplayer network games. In these cases, it is more important that there be as little delay between packets as possible than it is to conserve network bandwidth.
>>
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Interestingly enough, I'm looking at the same problem. I'm working with real-time control systems. The real-time OS is sending data to a monitoring station, which must be updated as soon as possible, and packet sizes can often be as little as 20 bytes. Thankfully data doesn't always change constantly, so network bandwidth isn't the issue, but rather notifying the client as soon as possible is.
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Just to let u know..
There seems to be a problem with SEH raising exceptions in release mode (using VC++ 6 SP4)
In release mode, a divide by zero does not raise any exceptions but it does in debug mode. However, if I uncomment the cout line after the divide (in release mode), an exception would be raised.
If the program was compile with the /EHa option (asynchronous exception), then an exception is always raised.
I didn't do an disassembly but it's probably due to the compiler not generating the divide code since it's not used.
[source]
#include < windows.h >
#include < iostream >
#include < stdexcept >
using namespace std;
void SEH_Translator( unsigned int u, EXCEPTION_POINTERS* pExp )
{
throw exception("SEH exception");
}
void main()
{
try
{
_set_se_translator(SEH_Translator);
int x,y;
x = 9999;
y = 0;
int z = x/y; // cause a divide by zero exception
// cout << z << endl; // uncommenting this throws an exception in release mode
}
catch(...)
{
cout << "Exception caught" << endl;
}
}
[/source]
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As you said, compiler optimization in release mode may have removed the divide-by-zero.
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The reason that an exception doesn't occur in this code in release is because the optimizer will throw all the code away as it does nothing... As soon as you include the cout z has to around so a value can be displayed hence the exception - In a debug build no code is optimized hence you get the behaviour expected.
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