C / C++ / MFC

Re: [C++] Where to find coding examples and exercises?

2-Apr-20 6:16

They don't know C++ at all, just the basics of C without any practical programming with the exception of the laboratories and exams (of course there are exceptions, one or two each batch of 30).

Most of them rarely used a compiler, coding rules are way bove their head.

GCS d--(d+) s-/++ a C++++ U+++ P- L+@ E-- W++ N+ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t+ 5? X R+++ tv-- b+(+++) DI+++ D++ G e++ h--- r+++ y+++* Weapons extension: ma- k++ F+2 X

Richard MacCutchan2-Apr-20 6:44

Re: [C++] Where to find coding examples and exercises?

2-Apr-20 6:44

den2k88 wrote:
Most of them rarely used a compiler

More recruits to QA Cry | :((

den2k882-Apr-20 6:49

2-Apr-20 6:49

They usually use SO, CP is quite unknown here in Italy except for the actual professionals.

GCS d--(d+) s-/++ a C++++ U+++ P- L+@ E-- W++ N+ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t+ 5? X R+++ tv-- b+(+++) DI+++ D++ G e++ h--- r+++ y+++* Weapons extension: ma- k++ F+2 X

TCHAR vs built in char

Calin Negru1-Apr-20 22:52

1-Apr-20 22:52

How is TCHAR and char different?

den2k881-Apr-20 22:57

1-Apr-20 22:57

TCHAR is a macro that is evaluated either as char or unsigned short, depending on the enabling of unicode support.

TCHAR is favored for strings because it reduces the risk of misalignemnts between pieces of code that use char and pieces that use short, also allows for a modicum of configurability (in theory you could enable Unicode strings just enabling Unicode support, in practice it's not that simple).

GCS d--(d+) s-/++ a C++++ U+++ P- L+@ E-- W++ N+ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t+ 5? X R+++ tv-- b+(+++) DI+++ D++ G e++ h--- r+++ y+++* Weapons extension: ma- k++ F+2 X

Richard MacCutchan1-Apr-20 23:50

1-Apr-20 23:50

den2k88 wrote:
in practice it's not that simple

It can be if you use all the correct macros. I have a number of projects where it works seamlessly.

den2k881-Apr-20 23:55

1-Apr-20 23:55

It is if you use all the correct macros and good programming practices. Which, on large and/or legacy projects with multiple programmers in space and time, is not necessarily a valid assumption, sadly.

GCS d--(d+) s-/++ a C++++ U+++ P- L+@ E-- W++ N+ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t+ 5? X R+++ tv-- b+(+++) DI+++ D++ G e++ h--- r+++ y+++* Weapons extension: ma- k++ F+2 X

kalberts2-Apr-20 11:20

kalberts

2-Apr-20 11:20

Why does "sadly" sometimes make me smile? Smile | :)

den2k882-Apr-20 21:15

2-Apr-20 21:15

I've seen things.
We all have seen things.

GCS d--(d+) s-/++ a C++++ U+++ P- L+@ E-- W++ N+ o+ K- w+++ O? M-- V? PS+ PE- Y+ PGP t+ 5? X R+++ tv-- b+(+++) DI+++ D++ G e++ h--- r+++ y+++* Weapons extension: ma- k++ F+2 X

leon de boer2-Apr-20 4:50

leon de boer

2-Apr-20 4:50

The overwhelming use of it is when you want to use unicode but have the code portable for the none unicode situation.

It isn't just TCHAR you use in that situation but you place all string literals inside the _T() or TEXT() macros so they also port and use the TCHAR string functions _tcslen for strlen, _tcscpy_s for strcpy_s etc so all the string functions port.

So being precise about this on Visual Studio with a project open goto the last debug menu which is the project properties then goto

Configuration Properties->Advanced->Character Set you now have 3 options not set (aka use ansi), use unicode and use multi-byte wide character. When you use TCHAR and the above macros and stuff in <tchar.h> you can compile your code in any of those modes and it will work completely seamlessly.

I use it a lot because I write many multilingual windows applications which have large use in non English language areas.

It becomes second nature like using stdint.h and proper sized integers rather than int, short, long etc which are problematic porting.

In vino veritas

modified 2-Apr-20 10:59am.

Calin Negru2-Apr-20 5:54

Re: Thanks for a new feature

2-Apr-20 5:54

That sheeds light on it. Thanks for taking time to write that down and share your knowledge leon.

`DreamLand Page` on facebook

modified 2-Apr-20 12:34pm.

Thanks for a new feature

Anthony Appleyard31-Mar-20 4:14

Anthony Appleyard

31-Mar-20 4:14

I noticed today when editing a program on Visual C++ 2015 that if I left a variable undeclared, it showed underlined in red, similar to misspellings in Word for Windows. That is useful. Thanks to whoever put that feature in.

Richard MacCutchan31-Mar-20 4:33

Re: Thanks for a new feature

31-Mar-20 4:33

I think this message is meant for Microsoft.

ZurdoDev1-Apr-20 3:59

ZurdoDev

1-Apr-20 3:59

And about 5 years ago too.

Social Media - A platform that makes it easier for the crazies to find each other.

Everyone is born right handed. Only the strongest overcome it.
Fight for left-handed rights and hand equality.

Re: Thanks for a new feature

ZurdoDev1-Apr-20 3:59

ZurdoDev

1-Apr-20 3:59

CodeProject did not write Visual Studio. But I agree, it's a good feature.

Social Media - A platform that makes it easier for the crazies to find each other.

Everyone is born right handed. Only the strongest overcome it.
Fight for left-handed rights and hand equality.

Getting 2203 error while doing silent installation of MSI

Vijay53330-Mar-20 3:34

Vijay533

30-Mar-20 3:34

Hi i am using following code for silent installation of MSI am getting 2203 error.

This is the code i am using.

Not working if i pass domain Administrator username and password, it is giving error like "The installer has encountered an unexpected error installing this package. This may indicate a problem with this package. The error code is 2203".
Can anyone tell me how to resolve this issue.

Note: It is working fine if i pass the local/Built-in administrator username and password.

UAC is enabled in the PC.

strTempFolderToDownload = "msiexec /a "+ MSILocaltion + " ALLUSERS=0" + " TARGETDIR=" + '"' +Installlocation+ '"' + " /qb"

bLogonRet = LogonUser(strUserName, strDomainName, strPassWord, LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT , &hToken);
if(bLogonRet && hToken!=NULL)
{
BOOL benvBlock = CreateEnvironmentBlock(&lpvEnv, hToken, TRUE);
if(benvBlock)
{
dwSize = sizeof(szUserProfile)/sizeof(WCHAR);
BOOL bUsrProDir = GetUserProfileDirectory(hToken, szUserProfile, &dwSize);
if(bUsrProDir)
{
bCreateRet = CreateProcessWithLogonW(strUserName, strDomainName, strPassWord, LOGON_WITH_PROFILE, NULL, CT2W(strTempFolderToDownload),CREATE_UNICODE_ENVIRONMENT, lpvEnv, szUserProfile, &si, &pi );
}
}
}

As well as i tried only with following code also no luck.
CreateProcessWithLogonW(strUserName, strDomainName, strPassWord, LOGON_WITH_PROFILE, NULL, CT2W(strTempFolderToDownload),CREATE_UNICODE_ENVIRONMENT, NULL, NULL, &si, &pi );

CreateProcessWithLogonW(strUserName, strDomainName, strPassWord, NULL, NULL, CT2W(strTempFolderToDownload),NULL, NULL, NULL, &si, &pi );

Re: Getting 2203 error while doing silent installation of MSI

Richard MacCutchan30-Mar-20 3:36

Re: Getting 2203 error while doing silent installation of MSI

30-Mar-20 3:36

See some of these suggestions: MSI am getting 2203 error - Google Search[^]

Dave Kreskowiak30-Mar-20 3:51

Dave Kreskowiak

30-Mar-20 3:51

2203 in an administrative install usually means "access denied".

Where are you installing it to and is the account running the MSIEXEC command an administrator? Is the .MSI copied to the local machine before you launch it?

Also, "ALLUSERS=0" isn't really a thing. The behavior of ALLUSERS isn't defined for a value of 0. The behavior is defined for values 1 and 2 and for an empty string ("").

A value of 1 is for a "per-machine" install or "all users", which is typical if you're installing to Program Files.

A value of 2 is for letting MSIEXEC determine which type of installation it should do, checking the value of the MSIINSTALLPERUSER property.

See ALLUSERS property - Win32 apps | Microsoft Docs[^] for more.

Asking questions is a skill
CodeProject Forum Guidelines
Google: C# How to debug code
Seriously, go read these articles.

Dave Kreskowiak

Re: Getting 2203 error while doing silent installation of MSI

Vijay53331-Mar-20 0:33

Vijay533

31-Mar-20 0:33

Hi Dave,

Thanks for the posting.

1.) I am trying to install in C:\Program Files(x86)\ folder.
2.) I logged in as non admin user, am trying to install the MSI with domain Administrator credentials am using CreateProcessWithLogonW to do this.
3.) Yes, i copied the installer into temp location.

Re: Getting 2203 error while doing silent installation of MSI

Dave Kreskowiak31-Mar-20 4:55

Dave Kreskowiak

31-Mar-20 4:55

OK.

In that case, if the command line your code generated works if an admin on the machine runs it, the problem is going to be in your code that logs in as an admin, but apparently doesn't run anything as an admin. I couldn't tell you what the problem is there.

Asking questions is a skill
CodeProject Forum Guidelines
Google: C# How to debug code
Seriously, go read these articles.

Dave Kreskowiak

Finding a directory

Anthony Appleyard29-Mar-20 18:32

Anthony Appleyard

29-Mar-20 18:32

Thanks for your help to people who ask queries.

I know how to ask for a file to read from, or a file to write to :-

BOOL GetFileName(HWND wn,char*file,char*titl,char*filter,short write/*=1*/) {short j;
strcpy(file,title);
ofn.lStructSize=sizeof(OPENFILENAME); ofn.hwndOwner=wn;
ofn.lpstrFilter=filter; ofn.lpstrCustomFilter=0;
ofn.lpstrFile=file; ofn.nMaxFile=1024;
ofn.lpstrFileTitle=title; ofn.nMaxFileTitle=1024;
ofn.lpstrInitialDir=0; ofn.lpstrTitle=titl;
ofn.Flags=write?OFN_OVERWRITEPROMPT:OFN_FILEMUSTEXIST;
j=(write?GetSaveFileName(&ofn):GetOpenFileName(&ofn))?1:0;
return j;}

('ofn' and 'title' are declared globally.)

but when I need to ask for a directory / folder, I must do something like this:

K=GetFileName(wn, slidefilename, "name of a file in the directory to read slides from?", slidefiletype, 0);

Is there something like GetOpenFileName, but returning the name of a directory rather than the name of a file?

modified 30-Mar-20 0:49am.

Re: Finding a directory

leon de boer29-Mar-20 20:26

leon de boer

29-Mar-20 20:26

SHBrowseForFolder
SHBrowseForFolderA function (shlobj_core.h) - Win32 apps | Microsoft Docs[^]

CodeProject has a sample app
How to Browse for a Folder[^]

In vino veritas

Passing an array as argument to a function

Calin Negru28-Mar-20 22:15

Re: Passing an array as argument to a function

28-Mar-20 22:15

Hi What is the syntax when you want to pass an array as argument? I`m looking for syntax for both function call and function definition.

Richard MacCutchan28-Mar-20 22:34

Re: Passing an array as argument to a function

28-Mar-20 22:34

Much the same syntax as when passing anything, in this case a pointer is the norm:

C++

int myFunction(char* anArrayOfChars) // a pointer to the array
{
    // function code ...
}

...

// calling code
char anArray[32];
// fill the array
int value = myFunction(anArray) // name of the array is a pointer to its content

Calin Negru28-Mar-20 22:59