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I am receiving a struct which has floats, int etc. I use ntohl etc on the ints and it all works fine. But on the floats, I am not sure what to use to get the bits in the right order. I had thought that ntohl will take any 32 bit number and convert it but I know when I use it, it does not convert it correctly. I tried to convert it myself one bit at a time and it is OK. Is there an easier way with a call already done?
Thanks in advance.
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float floatVal =
unsigned long *longPtr = (unsigned long*)&floatVal;
*longPtr = ntohl(*longPtr);
Ryan "Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"
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I have a question regarding standard out. I would like to re-direct standard out to a pipe. To connect to the pipe, I use CreateFile. Then, I must use WriteFile to send over the pipe. Is there a way to do this without the WriteFile call. Instead, simply redirect the standard out stream to the Pipe.
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As everything in Windows are represented by handles, you can use GetStdHandle and SetStdHandle to operate on the standard stream handles (file handles). Just use CreateFile to create and connect the pipe, then use SetStdHandle with appropriate parameters to redirect the standard stream into the pipe.
These functions will redirect the standard streams or get their handles for the current process only. So for all other processes, the streams remain normal. But it's good practise nevertheless to first use GetStdHandle, save it, and restore it back after you're done.
-Antti Keskinen
----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.
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Hi.. I have an application that create the thread at PRINT button is clicked, and stop the thread when STOP PRINTING button is clicked.
<br />
UINT PrintFile(LPVOID lParam)<br />
{<br />
myApp *cc=(myApp*)lParam;<br />
while(!stopprinting)<br />
{ <br />
if(stopprinting)<br />
{ <br />
break;<br />
}<br />
cc->myClass->Print()<br />
} <br />
return 0;<br />
}<br />
<br />
void myApp::print()<br />
{<br />
....<br />
CWinThread *printingThread; <br />
printingThread = AfxBeginThread(PrintFile,this);<br />
printingThread->m_bAutoDelete = FALSE;<br />
}<br />
then I have a class called myClass in the same application. myClass print the files, it ofcourse, has other functions except Print().
Ok here how Print() does print the file
<br />
void myClass::Print()<br />
{<br />
for(int i=0;i<10;i++) <br />
{<br />
CString f= array[i];<br />
PrintFile(f);
finishedprinting = false;<br />
WaitForFilePrinted();<br />
finifhsedprinting = true;<br />
<br />
}<br />
}<br />
The printer server send the window messages when the file starts and ends printing doc, to application and myApp catch those messages. I had to used RegisterWindowMessage() and in MessageMap
I add following statement,
ON_REGISTERED_MESSAGE(BlackIcePrintMessage,OnPrinterMsg)
and then OnPrinterMsg() catch the messages and do something when the document get started printing, and ended printing. when the document get printed, finishedPrinting get set to true
<br />
finishedprinting = true;<br />
I want my application to be continue on the next file if and only if finishedprinting = true.
so I wrote following function to wait for the file to really get printed.
<br />
UINT WaitForFilePrinted(LPVOID lParam)<br />
{<br />
myClass *cc=(myClass*)lParam;<br />
while(!finishedprinting)<br />
{ <br />
if(finishedprinting)<br />
{ <br />
break;<br />
}<br />
cc->WaitForPrinter();<br />
} <br />
AfxEndThread(1); <br />
return 0;<br />
}<br />
void myClass::WaitForFilePrinted(void)<br />
{<br />
CWinThread *printingThread; <br />
printingThread = AfxBeginThread(WaitForFilePrinted,this);<br />
printingThread->m_bAutoDelete = FALSE;<br />
<br />
}<br />
<br />
void myClass::WaitForPrinter(void)<br />
{<br />
while(!finishedprinting)<br />
Sleep(500);<br />
}<br />
I'm not sure I'm doing the right thing. And it is seems like thread inside another thread. it is not doing what I want to do..and I got access error. All I want is that
send the file to the printer..
wait for the messages from the printer..
when I get the message that the printer said the file get printed.. send next file
keep the same process, untill all the files gets printed.
could you please give me some suggestion how should I pause myApp so it will wait for the file just send to printer gets printed and then move on next one?
thank you
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Too much code. Just succinctly explain what you want to accomplish.
Kuphryn
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Ok. Here what I want.
I have to print the files (sending to the printer).
I want to send next file after the current file is finished printing.
To do so, I can catch the messages that sent from printer (the printer that can send the messages to application) and respond differently to different messages like
. record the time of the file starts printing when application recieves STARTDOC message,
. record the time of the file finished printing, number of pages printed, and print the next one when application recieves ENDDOC message.
How to recieve the messages from printer.
The printer sends the messages like window messages to the application.
I used RegisterWindowMessage() and add ON_REGISTER_MESSAGE(printermsg,OnPrinterMessage) in the MESSAGE_MAP. I have no problem getting messages from printer.
Here the prolem comes,
My application has the button called "PRINT" and "STOP".
When user click on PRINT all the files get printed one after another. but it stop printing immediately when STOP button get hits.
So what should I do to look at printer messages to print one file after another, and at the same time, whatching if the STOP button get hited to stop printing immediately.
Thank you.
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CPU usage increases for list view for same app under XP
-------------------------------------------------------
I've been working on an application for several years which uses MS ListView controls to display large grids of data (perhaps 50 lines by 100 columns).
background: The application displays market data, amongst other things, from electronic exchanges.
The application updates individual cells relatively rapidly.
I handled the CustomDraw events to provide formatting such as colors.
The list view is in virtual mode.
All was well on Win2000. CPU usage was reasonable. However, when I open the same window under XP, the CPU usage seems to increase dramatically.
I used the ATLControls.h list view wrapper as a thin wrapper around the control, and compiled under VC6, SP5.
Does anyone have any clues?
Thanks in advance
Dan Hill
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Run per-method profiling on the application to determine which methods are using up the most CPU time. Also, try disabling the XP themes and run in classic mode to see if that is the problem (shouldn't be, but it never hurts to try).
Ryan "Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"
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I have developed a Simple MFC GUI to allow a user to display and control an activity.
The program works fine on a PC with Visual Studio installed, but when I transfer the program
to a Laptop computer I get an Assertion Failure line 410 of file occmgr.cpp.
I build a Deployment & Install project to formally install the program, but still keep
getting the same error.
The pogram uses a DLL and events, the DLL is present on the Laptop.
I am stuck of things to try.
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What is on this line?
What is it asserting ?
Papa
while (TRUE)
Papa.WillLove ( Bebe ) ;
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Dont have any other information apart from the fact that can install the program on another PC without Visual Studio and it runs OK, but not on this Laptop computer.
We did try and install on other program and it failed in the same way!?!
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Search for occmgr.cpp in your visual studio install directory
open it and go to line 410
You'll get some more info by doing this
Papa
while (TRUE)
Papa.WillLove ( Bebe ) ;
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section of file occmgr.cpp
if(pOccDlgInfo->m_pItemInfo[i].nId)
{
COleControlSiteOrWnd *pTemp =
new COleControlSiteOrWnd(
::GetDlgItem(pWndParent->GetSafeHwnd(), pOccDlgInfo->m_pItemInfo[i].nId),
pOccDlgInfo->m_pItemInfo[i].bAutoRadioButton);
ASSERT(pTemp->m_hWnd); !!!! This is Line 410 !!!! if(posOld)
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The problem is a known issue to the VS.NET 2003, you can find the resolution in the following KB:
BUG: "HRESULT - 0x80010106" Error When You Run a Managed C++ Application
http://support.microsoft.com/?id=824480
However, for a MFC application, the managed entry point function should be
modified as:
//in Appname.cpp
...
#define _WIN32_WINNT 0x501 //for Windows2000, please use 0x0500
#include <objbase.h>
#include <stdio.h>
#using <mscorlib.dll>
using namespace System;
extern "C" void WinMainCRTStartup();
[System::STAThread]
int mymain() //the new entry point
{
//Initialize COM
HRESULT hr = CoInitialize(0);
//Initialize the CRT
WinMainCRTStartup();
//uninit
CoUninitialize();
return 0;
}
Papa
while (TRUE)
Papa.WillLove ( Bebe ) ;
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Placed the code in but get error:-
c:\Test_GUI_New\Test GUI1.cpp(16): fatal error C1190: managed targeted code requires '#using <mscorlib.dll>' and '/clr' option
Help, I am sure that are almost there.
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Played about with the compile options, now getting error:-
Test GUI1 error LNK2019: unresolved external symbol _main referenced in function _mainCRTStartup
Help!
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Still get the linker error:-
Test GUI1 error LNK2019: unresolved external symbol _main referenced in function _mainCRTStartup
No idear what to do now!?!
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Is there any known solution for dynamically compiling code, even simple one, for example to keep reasonable performance when evaluating a user-defined function in a graph application (instead of interpreting) ?
something like:
double (*fn)(double x) ;
...
fn = Compile("{return sin(x);}") ;
res = fn(3.14) ;
I've tried generating some assembly code from the expression and putting it in a char array that I can execute. This works, but it's platform specific and it's reinventing the wheel.
An other solution that I did not test would be to directly call the compiler and for example generate a dll you can call afterwards, but It's not really clean nor portable !
Any ideas for any clean solution ?
Application of that could also be a "compiling spreadsheet" etc...
Mooze
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Well, C++ code is not interpreted, so there probably isn't a "clean" solution, not without re-inventing the wheel (as you say.) You could try embedding Perl or Python into your app.
"Fish and guests stink in three days." - Benjamin Franlkin
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Yes, I could, and I actually did it in some cases, but it does not solve the (interpreting) performance problem. It seems .net allows some sort of dynamic compilation, but the whole thing remains interpreted as far as I understand.
Thanks anyway
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I've never written a DLL before so this may be a dumb question. In a project I'm working on I'm wanting to put some of the functionality in a DLL. I created it using the MFC DLL Wizard, but I'm not sure if I'm going about creating it correctly. After it created it's base classes I added my own to the project and am adding my functionality to it. Is that correct or should I be adding everything to the classes it created? Also how do I go about using the DLL? Can I simply include the headers in my other project or will I have to use LoadLibrary and such? Thanks for the help.
- Aaron
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There are 2 ways to export things from DLLs
1. Via DEF files
2. Via _declspec(import) & _declspec(export)
And there are two ways to get it into the client:
1. Via Implicit linking - IE with a .LIB file
2. Via Explict linking - IE LoadLibrary/GetProcaddress
Which you choose very much depends on what you want to do. For the most part, people use Implicit linking and DEF files - simply as DEF files make adding/removing functionality to/from the DLL easier.
If your a beginner, id stick to _declspec and implict linking.
Have a read of
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccore98/HTML/_core_using_implicit_linking.asp
To get you started.
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