C++Builder Developer's Journal

thanks Remy as always. If you try this version you will see that if you always keep pressed the keys Z + C and only then press X without leaving Z + C, you will see as output on the Caption s = "ZC" and never s = "ZXC", as if keeping Z keys always pressed + C inhibits the reading of the X key (in ot...

wrote this code to study windows hooks but it has several problems. Some problems are of response speed, while others are of correctness of the output. For example, if I press the keys with code: (90="Z",67="C") together and holding them down I also press the key (88="X"), its pressure is not detect...

Hello, I ask someone who has already studied this kind of problems: generating a series of samples for the sound card in order to generate a sine wave. I am using the following function: but I did not understand if the sound card reads integer or floating point values. float *buffer = 0; buffer = (f...

thanks Remy,
really very strange that it is so complicated to use a simple timer even if it is as precise as you want.

https://www-user.tu-chemnitz.de/~heha/petzold/ch22d.htm

you're right Remy, I had missed how usleep () was made, I thought the author was referring to a Linux function. But how does that author of that article still say that Sleep () is not accurate? Does this mean that the Sleep () is not precise in the sense that, if Sleep (1000) ms is set, it could hap...

sorry Remy, but do you think that the Sleep () function is a kind of closed loop that takes up a lot of CPU? We created our usleep() function to get mostly accurate MIDI timing which seemed to work well. Unfortunately, the usleep() function does not actually sleep but spins in a tight loop. This is ...

Hello, but, isn't it strange that to play a "type 1" midi file you have to do all this work? 1) calculate abs-time of each track 2) reorder the events by abs-time 3) recalculate the delta times in respect of the original time invented example not working: ch, note, velocity, delta-time, abs-time tra...

thanks Remy as always.
I simply used your suggestion and everything works now.

thanks Remy. Here is my experiment. void __fastcall TForm1::Button1Click(TObject *Sender) { int num = MyList->Count; MIDIEVENT *MyArr = new MIDIEVENT[num]; MIDIHDR header = {}; MIDIEVENT *ev = NULL; int a=0; for(int i = 0; i < num; i++) { MyStruct *s = (MyStruct*) MyList->Items[i]; if(s->a >= 0x80 &...

I'm still studying these midi functions of windows but the darkest part of the code is in the calculation of the buffer to be passed to the appropriate function. If I write: header.dwBufferLength = header.dwBytesRecorded = (sizeof (MIDIEVENT) * 2) - (sizeof (ev-> dwParms) * 2); everything freezes. i...

thanks Remy.
I used a TList to take advantage of the Sort in case I needed it.

Hello, I'm not sure if what I wrote is correct. I am using a TList as a container for pointers to MIDIEVENT structures and after filling the TList, I have to initialize the member (header.lpData) of the MIDIHDR structure with the start address of the first structure present in the TList. thank you T...

thanks Remy

how do you reorder a list for (c) and (e)?

exceptional as always, thanks Remy