C / C++ / MFC

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Re: EMERGENCY !! Project in crash landing !! Sreekanth Muralidharan5-Aug-05 23:11 Sreekanth Muralidharan 5-Aug-05 23:11  Hi Abebe, Thanks for your reply. I know a character is only 1 byte which cannot be accomodated there. My problem is not that.. See this: char * buff = new char[5];<br /> buff[0] = 'a';<br /> buff[1] = '\0'; // This should also be a member in the array. Not a delimiter !!<br /> buff[3] = 'c';<br /> printf(buff); Else any other way to send a 00 through a serial port. I use a serial port monitor to monitor the data from the port. Suppose I have sent this string: "Code Project" The monitor should display 00. Regards Sreekanth Muralidharan, Corporate Systems Consultant [Embedded Systems], INDIA Re: EMERGENCY !! Project in crash landing !! Trollslayer5-Aug-05 4:03 Trollslayer 5-Aug-05 4:03  '\0' is a terminator not space or EOL. It is important to keep your terms clear as it leads to more confusion as your work becomes more complex. If you have a terminator as a member then you must treat it as an array and control the length elsewhere, you cannot use normal string handling functions. Elaine The tigress is here which one is better? Smith#4-Aug-05 22:31 Smith# 4-Aug-05 22:31  To acess a control... * using GetDlgItem(IDC_) is better or using the control Variable m_Control is better? regards, Rookie Re: which one is better? Bob Stanneveld4-Aug-05 22:36 Bob Stanneveld 4-Aug-05 22:36  Hello, It's just a matter of preference. Using the GetDlgItem() involves a lot of ugly typecasts and unnassecary code. Using the m_Control variable looks much more cleaner. I even think that it is slightly faster than the other method, since you already have a CWnd derived object. (Unless you use primitive types or CStrings for managing dialog data.) Behind every great black man...             ... is the police. - Conspiracy brother Blog[^] Re: which one is better? Smith#4-Aug-05 22:49 Smith# 4-Aug-05 22:49  thanx bob regards, Rookie Installing MFC...2% complete. Re: which one is better? Bob Stanneveld5-Aug-05 0:46 Bob Stanneveld 5-Aug-05 0:46  You're welcome Behind every great black man...             ... is the police. - Conspiracy brother Blog[^] Re: which one is better? toxcct4-Aug-05 22:48 toxcct 4-Aug-05 22:48  as bob said, using GetDlgItem() each time you want to access a control add several function calls to your code that you could avoid. but of course, using a member variable to store the CWnd* of a control is working unless you initialize it correctly (with... GetDlgItem() ) what i used to do personnaly is having a set of m_p???????? variables in my Dialog classes, that i initialize into OnInitDialog() with a set of GetDlgItem() calls... TOXCCT >>> GEII power [toxcct][VisualCalc] Re: which one is better? Gary R. Wheeler5-Aug-05 15:54 Gary R. Wheeler 5-Aug-05 15:54  toxcct wrote: what i used to do personnaly is having a set of m_p???????? variables in my Dialog classes, that i initialize into OnInitDialog() with a set of GetDlgItem() calls... You do realize that the return value of GetDlgItem() points to a temporary CWnd object that is only valid for the current Windows message? This means you can't save that return value and use it later, since CWnd object may no longer exist. Software Zen: delete this; Re: which one is better? Marc Soleda4-Aug-05 22:54 Marc Soleda 4-Aug-05 22:54  IMO depends on the situation. eg: if you have lots of string resources and you need to reset its value it would be a good thing to create all of them consecutively to permit looping from the base one to the last just incresing a counter. Marc Soleda ... she said you are the perfect stranger she said baby let's keep it like this... Tunnel of Love, Dire Straits. Re: which one is better? Smith#4-Aug-05 23:45 Smith# 4-Aug-05 23:45  nice stuff guys.. it seems that i'd use both the ways according to the need.. thank u so much regards, Rookie Installing MFC...2% complete. Re: which one is better? Pradyumna Gogte4-Aug-05 23:57 Pradyumna Gogte 4-Aug-05 23:57  Hi, Well you could use either method is correct however, using m_Control has a slight overhead. The reason is that m_Controls are MFC controls while the form has windows controls. So when the form is instantiated the MFC code kicks in and creates the m_Controls. I would prefer this method if I have a lot of interaction with the controls. However if I dont have to interact with the controls or have only to interact with them one time then it is better to use the GetDlgItem method. Prady Re: which one is better? Bob Stanneveld5-Aug-05 0:46 Bob Stanneveld 5-Aug-05 0:46  Overhead you say? If you use the other method for a lot of controls you typically use not so much (controls in option dialogs for exemple), you create more unnaccesary overhead using more code to initialze and use the controls. All the unaccessary error checks, function calls are also overhead. The initialization done by MFC is behind the scenes and in GUI applications, the overhead added by MFC doesn't matter very much. So why go through all the fuss of writing pure API code with all the trouble it brings when you can do without? IMHO, one should write as few lines of Win32 API code for the GUI when he / she uses MFC. This is not only for consistancy, but also saves a lot of troubles. Behind every great black man...             ... is the police. - Conspiracy brother Blog[^] Re: which one is better? Pradyumna Gogte5-Aug-05 2:11 Pradyumna Gogte 5-Aug-05 2:11  True, but you did not read my post. I said only if you wanted to do one or two interactions with the control you could use GetDlgIt.. fn. Prady Re: which one is better? Bob Stanneveld5-Aug-05 3:43 Bob Stanneveld 5-Aug-05 3:43  If you realize that only 10% of your code is used 90% of the time leaves you 90% of your code that is used almost never. Believing this, most of your controls are almost never used. If I would use your method and write GetDlgItem() code, I would be better off writing pure C windows applications, simply because it would make more sense. The control variable method on the contrary, fits perfectly in the MFC. Thats one part of the MFC that is specially designed that way, jsut because you don't have to use GetDlgItem() anyore! Why would you use MFC in the first place if you bypass all the fancy stuff it was designed for? Behind every great black man...             ... is the police. - Conspiracy brother Blog[^] Re: which one is better? Ravi Bhavnani5-Aug-05 2:38 Ravi Bhavnani 5-Aug-05 2:38  GetDlgItem() is error prone - see this[^] article. /ravi My new year's resolution: 2048 x 1536 Home | Music | Articles | Freeware | Trips ravib(at)ravib(dot)com Re: which one is better? Trollslayer5-Aug-05 4:04 Trollslayer 5-Aug-05 4:04  There may be times when you create controls dynamically then GetDlgItem() is usually easier, otherwise m_Control makes for clearer and more compact code. Elaine The tigress is here Audio : DirectSound vs Win32 API ? HVoss4-Aug-05 22:26 HVoss 4-Aug-05 22:26  I want to start with audio programming and want to know the advantages and disadvantages of using DirectSound and of the Windows SDK audio functions (waveIn and waveOut). Which is better to handle? Which is faster or more powerfull? Which is better to use? Thanks for helping Heiko Voss Re: Audio : DirectSound vs Win32 API ? badal_akr4-Aug-05 23:18 badal_akr 4-Aug-05 23:18  Basically Win32 API also very good to use i found Direct Sound is more complex. And within Win32 u can manage all the audio Signal properties i,e Sampling, Mono or stereo. Data rate call back etc.... Anil Kumar Re: Audio : DirectSound vs Win32 API ? peterchen5-Aug-05 0:30 peterchen 5-Aug-05 0:30  DirectSound is faster and mroe Powerful. waveOut is better to use. It all depends on what you want to do. What do you want to do? Pandoras Gift #44: Hope. The one that keeps you on suffering. aber.. "Wie gesagt, der Scheiss is' Therapie" boost your code || Fold With Us! || sighist | doxygen Re: Audio : DirectSound vs Win32 API ? HVoss5-Aug-05 1:27 HVoss 5-Aug-05 1:27  I want to do ALL Record, play, save as WAV and read WAV. Perhaps some processing. But my actual task is a full duplex application. I tried the FullDuplex example of DirectX SDK (9.0c) and got a latency of nearly a second!!! I build also a full duplex application with Win API and got a latency in "normal" range (smaller than 0.1s). I was surprised and posted my question. If DirectX is more powerfull i want to use it. But what's with this really long latency time? I tried the original example! Greetings Heiko Re: Audio : DirectSound vs Win32 API ? badal_akr5-Aug-05 1:53 badal_akr 5-Aug-05 1:53  Hey Heiko, Can you exactly tell me how do you measure the Latency. It will be helpfull for me. Regards Anil Kumar Re: Audio : DirectSound vs Win32 API ? HVoss5-Aug-05 2:05 HVoss 5-Aug-05 2:05  Hi Anil, I speak in a microphone, the signal is going through the application, send to the output and i listen to it with headphones. The time between talking and hearing is my latency. It's not really a scientific method but for a first test it's ok. And the difference between the two used samples is clearly to hear. Later i will measure the latency between input and output with a more exact method. Greetings Heiko Re: Audio : DirectSound vs Win32 API ? peterchen5-Aug-05 3:08 peterchen 5-Aug-05 3:08  I don't know much about the original example With DS, I have a playback/capture offset of about 500 samples in a release build (this includes codec delay, but not playback latency - but that's a few ms) There might be some processing in the default sample (e.g. capturing 1 s of data, processing it, and playing it back), some bad SC config or whatever. DirectSound shines for playback when you are mixing multiple buffers, do 3D sound effects, etc. Capture is a bit neglected in the DirectSound API. I am not sure if the waveOut API supports more than the 2 channels / 48kHz API - check that if you need it! OTOH, the waveI/O is extremely simple compared to DirectSound. In DirectSound, you cannot get robust duplex without running your own threads. You need some basic understanding of COM, and you have gazillions of soundcard configuraiton options, which you will spend a lot of frustrating time fine-tuning them. Pandoras Gift #44: Hope. The one that keeps you on suffering. aber.. "Wie gesagt, der Scheiss is' Therapie" boost your code || Fold With Us! || sighist | doxygen C# as scripting lang in MFC App Ning Hu4-Aug-05 21:22 Ning Hu 4-Aug-05 21:22  Hi, Is it possible to use C# as a scripting language in a MFC app? Any input is welcome. Thanks Ning How to write a value in an exe in VC++ Girish6014-Aug-05 21:19 Girish601 4-Aug-05 21:19  Hello Friends I am developing an application in VC++, but i have stuck at a place The problem is i want to replace 4-digit value with another 4-digit value in an exe. When i am trying to read that 4-digit value from an Exe it is done successfully but when i am trying to replace that 4-digit value the exe crashes,and exe size comes back to 0 bytes. Can anybody help with this. VC++

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