C / C++ / MFC

Richard MacCutchan11-Jan-21 22:39

11-Jan-21 22:39

There are plenty of examples of using OwnerDraw on controls. Adding it to this class will be no different.

Member 1325158812-Jan-21 9:18

Member 13251588

12-Jan-21 9:18

Any url?

Victor Nijegorodov12-Jan-21 10:12

Victor Nijegorodov

12-Jan-21 10:12

Colored ComboBox
Implementing an OwnerDrawn ComboBox
and others:
Google

Member 1325158812-Jan-21 16:23

Member 13251588

12-Jan-21 16:23

These are derived from CComboBox, not from CMFCRibbonComboBox.
We are in a C++ MFC thread

Victor Nijegorodov12-Jan-21 21:07

Victor Nijegorodov

12-Jan-21 21:07

But the main principle of the owner drawing is still the same! You implement it in both edit (or static) box and in the listbox.

Richard MacCutchan12-Jan-21 21:24

C Programming code to build an echo varient that hopefully can be used in WinXP

12-Jan-21 21:24

www.google.com[^]

jackngill11-Jan-21 10:49

Re: C Programming code to build an echo varient that hopefully can be used in WinXP

11-Jan-21 10:49

Sorry for the cryptic nature of this question just trying to condense as much as I can.

I am trying to write a program in "C" which has a twist on the normal echo command in XPSP3
XP echo does not allow you to remove EOL characters when you redirect into text file with the >
I think they call it CRLF. However in my wanderings I have come across some "C" code that I think could compile a useful program. Here is some background info to illustrate:
The program that I hope to use would be called ECO.COM would be commandline for usage in CMD
ECO would be furnished with a flag (-X) that would give the user the choice to include the CRLF removal or would just be used just like echo command in XP without the -X flag. The ECO.COM file would be restricted to one line (80 Chars) long so the following could take place. The user could type for example
ECO.COM -X SET VARIABLE= (the ECO.COM would have with the -X flag to strip out the end CRLF so once the
SET VARIABLE= line was ridected to text file could easily be appended (>>) with a second ECO command or text file all on the same line. The resultant Text file could then be renamed to a .CMD file & called from another batch file thus setting the given %Variable%
I think they call it backticks or command substitution or some call it back quotes anyway here is the code which I have sought & tried to compile to create ECO.COM/EXE but it is not working can someone assist to make it work Please I think it would be very useful alternative to SET/P option in XPCMD? Thumbs Up | :thumbsup:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

       /* setting flag to remove crlf */
int main()
{
for (i = 1; i < argc; i++) {

            /* Check for a switch (leading "-"). */

        if (argv[i][0] == '-') {

            /* Use the next character to decide what to do. */

            switch (argv[i][1]) {

                case 'x':
                        printf("flag a was called\n");
                        break;

        }
    }
}

        /* part of script that echos 80 chars on one line */

int echo()
{
    char input[80];
    while(fgets(input, 80, STDIN)){  //read from STDIN (aka command-line)
        printf("%s\n", input);  //print out what user typed in
        memset(input, 0, strlen(input));  //reset string to all 0's

    return 1;
}

        /*  go to exit if the user enters -x flag */

      if (*char == -x) {
         goto remit;

      else

      if (*char == " ") {
         goto exit;
}
             /* remove carriage returns from one line /*


         remit;
int main()
{
    const char *remove_any_of = "\n\r";
    int c;
    while((c = getchar()) != EOF) {
        if (!strchr(remove_any_of, c)) putchar(c);

         exit;

    return 0;
}

Best Regards
JacknGill Big Grin | :-D

modified 12-Jan-21 15:57pm.

David Crow11-Jan-21 16:36

David Crow

11-Jan-21 16:36

jackngill wrote:
...tried to compile to create ECO.COM/EXE but it is not working...

What exactly does that mean?

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles

Re: C Programming code to build an echo varient that hopefully can be used in WinXP

jackngill11-Jan-21 22:25

Re: C Programming code to build an echo varient that hopefully can be used in WinXP

11-Jan-21 22:25

Hi David,

Many thanks for responding to my posting & yes I should of explained with more clarity in respect of my failure. This will be my first program written in "C" I usually write small batch programs in XP and/or sometimes in Win9x. I have found that CMD (although) is very good sometimes I could do with some assistance programs to ease XP's CMD. So I am trying to write small helper programs in "C" to facilitate this, just some background info which may or may not be relevant.

I have been to an online site which compiles my code as a check & a series of errors are reported which lead me to believe my code has errors & is not right I will display the output below from "https://www.onlinegdb.com/online_c_compiler"
The Compilation failed due to following error(s).

main.c:7:1: error: expected identifier or ‘(’ before ‘for’
 for (i = 1; i < argc; i++) {
 ^~~
main.c:7:15: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘<’ token
 for (i = 1; i < argc; i++) {
               ^
main.c:7:24: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘++’ token
 for (i = 1; i < argc; i++) {
                        ^~
main.c: In function ‘echo’:
main.c:29:28: error: ‘STDIN’ undeclared (first use in this function)
     while(fgets(input, 80, STDIN)){  //read from STDIN (aka command-line)
                            ^~~~~
main.c:29:28: note: each undeclared identifier is reported only once for each function it appears in
main.c: At top level:
main.c:38:7: error: expected identifier or ‘(’ before ‘if’
       if (*char == -x) {
       ^~
main.c:42:7: error: expected identifier or ‘(’ before ‘else’
       else
       ^~~~
main.c:47:14: error: unterminated comment
              /* remove carriage returns from one line /*
              ^

I am unclear as to what these errors messages mean really. Hope this gives you a rough idea as to where my failure is. I am concerned also about the structure of my potential program as I am not sure if it is right? any guidance would be appreciated? Also just as a tag-on due to the fact I am writing very small programs could you advise as to a small .com .EXE builder that I could use Please?
Best Regards

modified 12-Jan-21 4:38am.

Richard MacCutchan11-Jan-21 22:36

Re: C Programming code to build an echo varient that hopefully can be used in WinXP

11-Jan-21 22:36

You cannot have lines of code outside of functions in that way. Line 7 is a for statement but it cannot exist stand-alone like that, it needs to be part of some function. If you look below at function main, you can see the correct structure. I suggest you get hold of a copy of The C Programming Language - Wikipedia[^] and learn from the beginning.

jackngill11-Jan-21 22:58

Re: C Programming code to build an echo varient that hopefully can be used in WinXP

11-Jan-21 22:58

Hi Richard,

Reading between the lines I think you are saying my code is way off base & is fundamentally wrong. would the following correct the For section like so I have removed the int main() as I am assuming only one int main() is required. your advice is duly noted in respect of ground up code writing many thanks?

       /* setting flag to remove crlf */
int main()
{
for (i = 1; i < argc; i++) {

            /* Check for a switch (leading "-"). */

        if (argv[i][0] == '-') {

            /* Use the next character to decide what to do. */

            switch (argv[i][1]) {

                case 'x':
                        printf("flag a was called\n");
                        break;

            }
        }
    }

Richard MacCutchan11-Jan-21 23:09

Re: C Programming code to build an echo varient that hopefully can be used in WinXP

11-Jan-21 23:09

Yes, all code must be contained in a function. you can put it all in main for a simple program, but for more complex problems you should create other functions that can be called with different parameter values. The documentation explains it clearly.

jackngill11-Jan-21 23:15

Re: C Programming code to build an echo varient that hopefully can be used in WinXP

11-Jan-21 23:15

Thanks Richard,

I have edited/amended my first post to reflect what you have said. Yes small programs are a good place to start

many thanks!

Richard MacCutchan11-Jan-21 23:55

Re: C Programming code to build an echo varient that hopefully can be used in WinXP

11-Jan-21 23:55

You have another function inside main, which is also wrong:

C++

int echo(){
    char input[80];

Each function must stand alone in the main part of the source file:

C++

int echo()
{
    // code for the echo function
}

int main()
{
    // code for main, including any calls to echo
}

And get rid of those goto statements, that is really bad practice in modern programming. As I suggested above, get a copy of K & R and spend time learning the language properly. Trying to learn by questions here will take ten times as long, and not be comprehensive.

jackngill12-Jan-21 9:46

Re: C Programming code to build an echo varient that hopefully can be used in WinXP

12-Jan-21 9:46

Hi Richard,
Sorry for not being attentive but I have been trying to find the book that you referred to in respect of "C" programming & I have finally sourced a copy albeit in PDF format but I have none-the-less found it, so I've got it now. Also I have been viewing a u-tube video which I have downloaded from here:
https://www.youtube.com/watch?v=KJgsSFOSQv0[^]
Only because I am the type of person if I can see it visually I tend to retain the info a bit better as I am not the sharpest tool in the toolbox if you know what I mean.
The narrator in the video mentions code::blocks which comes with IDE text editor & compiler to run the programs I selected the portable version with mingw to get started I will install tommorrow & give test run I have also been listening to some of the examples on the utube video. I may be able to break my code sample down into say 3 stages and run the code in Code::Blocks to check if the code is somewhere near possibly (Test-running)?

When you refer to the goto statements as being very bad practice in modern programming the only reason I opted to use these was because batch scripting is familair ground to me & Batch uses goto :labels therein quite a lot. Also one of the web-sites stated that goto statements are bad because of the dangers of spaghetti code, however they went onto say that if used sparingly & in the case of flag usage e.g. & only confined to purely isolated cases (like flags -X) they were, (although frowned upon) were permissable.
If I could use them until I acquire the necessary alternative skillset would it be okay for now given my obvious limitations. I could then interchange the new code with the goto code at a later date or is there another reason which I am missing here that I should not be using them, like they will not compile etc?
I will also attempt to amend the 1st post code with amended curly brackets.

Best Regards

modified 12-Jan-21 16:11pm.

Richard MacCutchan12-Jan-21 21:32

Re: C Programming code to build an echo varient that hopefully can be used in WinXP

12-Jan-21 21:32

jackngill wrote:
I have been trying to find the book

Amazon has it The C Programming Language (2nd Edition): Amazon.co.uk: Kernighan, Brian, Ritchie, Dennis: 8601410794231: Books[^].

jackngill wrote:
The narrator in the video mentions code::blocks

I would recommend Visual Studio 2019 from Microsoft. It's free and runs natively, so does not require mingw.

jackngill wrote:
If I could use them (goto) until I acquire the necessary alternative skillset

If you do it properly in the first place you will find there is no need for them. Whilst they will always compile they really are best avoided, especially as a new boy.

jackngill13-Jan-21 5:24

Re: C Programming code to build an echo varient that hopefully can be used in WinXP

13-Jan-21 5:24

Hi Richard Thumbs Up | :thumbsup:

Thanks for sharing your experience & advice it has ironed out quite a few wrinkles- I will Kinda work last to the first of your quotes or in reverse order.

Quote:
If you do it properly in the first place you will find there is no need for them. Whilst they will always compile they really are best avoided, especially as a new boy.

I see, what about if I used a "if" "else" statement like e.g. if the user types or stipulates the "-x" flag with "ECO" then "ECO" removes the CRLF/EOL, "else" the user fails to input "-x" flag then "ECO" just echo's one line of text to the screen in the same fashion the normal echo statement does? If this is a suitable alternative I will work on amending the code?

Quote:
I would recommend Visual Studio 2019 from Microsoft. It's free and runs natively, so does not require mingw.

I have downloaded the community edition of Visual Studio 2019 it seems to be the free version, will I need additional software to convert code (ECO.h) to EXE/COM once I have corrected all my errors? and last but not least... (Edit) Oop's It does not seem I will be able to use the 2019 version as it is asking for Dot net vers 4.6 which is a bridge too far for winXPSP3 I think Vers 4.0 was the last for XP I will look for earlier vers compatable with XP.

Quote:
Amazon has it The C Programming Language (2nd Edition): Amazon.co.uk: Kernighan, Brian, Ritchie, Dennis: 8601410794231: Books[^].

It's okay I have managed to get hold of a copy "The C Programming Language" & will inwardly digest & will be good for referencing study.

Best Regards
David

Richard MacCutchan13-Jan-21 1:50

Re: C Programming code to build an echo varient that hopefully can be used in WinXP

13-Jan-21 1:50

jackngill wrote:
I see, what about if I used a "if" "else" statement

Exactly right, and you can eliminate any requirement for goto by correct use of if/else, while, switch, etc. My point was (sort of) do it the right way now, and life becomes much easier. Writing code that you know is poor or less efficient with a mental note to fix it in the future is usually a path to problems in the future.

jackngill wrote:
will I need additional software

No, Visual Studio includes all the components necessary to build source code into executables. BTW .COM files were abandoned years ago. Just make sure you include the right components (Visual C++ package) for building C/C++ programs. The same integrated compiler will build code written in either language.

jackngill13-Jan-21 5:26

Re: C Programming code to build an echo varient that hopefully can be used in WinXP

13-Jan-21 5:26

It seems that one of my previous replies/posts is under review for possible spam or at least at my end it is showing so. I do not understand why this is I have been reflecting over the content trying to think what may have triggered this, I'm not sure what would cause this reaction. Perhaps I need to contact a mod for clarification.

I think, I will need to check at further length Visual Studio 2017 works with XP but it depends on what vers of Dotnet is required I think Dot net framework Vers 4.0 was the last for XP

modified 13-Jan-21 11:43am.

Richard MacCutchan13-Jan-21 5:36

Re: C Programming code to build an echo varient that hopefully can be used in WinXP

13-Jan-21 5:36

Nothing showing here. When and if it does happen, just be patient. The automatic spam checker holds "suspect" messages in a queue. They are then reviewed by one of the many moderators here, and accepted or rejected as appropriate. Your messages may get picked up for spurious reasons, but it is a fairly intelligent system and will improve once it recognises you.

jackngill14-Jan-21 12:04

Re: C Programming code to build an echo varient that hopefully can be used in WinXP

14-Jan-21 12:04

Richard,
Yes decided to leave the site alone for a while to allow the spam-bot thing do it's thing. I took the oppertunity to look into/do some research into Visual Studio & which version would be suitable with windows XP.

This info may help others who might find themselves here. The version you can install is dictated in the main by the Dot Net Framework version as Visual Studio requires the relevant dot net framework installed which in the case of Windows XP (last DotNet for XP) "DotNet framework version 4.0" it needs to be installed with your OS. Now I have trawled a few sites looking at what the latest version would be for Windows XPSP3 & it is "Visual Studio 2010" which is going back some when the current vers at the time of writing is 2019. I have found it quite difficult to grab a 2010 version as we are talking old School but I elected to download an offline iso version called OFFLINESOFTWARES.COM_VS2010Express.iso. Not content with just downloading it (which incidently is 693Mb) I have scanned the iso with 2 virus checkers to check for malware & viruses, I do not have any affiliation with the VStudio website it was just the first one which I was successful in downloading it from. I would post the link but I will need to check if it is permissable here first. I think fully installed needs 2.2Gb of your HDD space.

Anyway My little rant over where/which Visual Studio 2010 which may or may not help others now is concluded. I think I will need to clear some HDD space to install it as it needs a fair amount of space. Okay "if" "Else" it is then re not using goto statements Thumbs Up | :thumbsup:

I have been undertaking some house keeping as I needed to clear some hard drive space to install Visual Studio Vers 2010. I have done so but it seems to be defaulting to C++ rather than "C" Will the editor accept "C" code rather than C++?
best Regards

jackngill15-Jan-21 23:59