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If you create it dynamically that means you already control where it is positioned. So what do you hope to achieve with drag and drop?
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To create "a button or checkbox dynamically on MFC ... window" you do the following steps:
1. create a variable of the CButton class
2. Call CButton::Create method to create a button or checkbox window.
That's all.
You only need to read the Microsoft Docs and know the exact size and position of your button within the parent (dialog or form view or some other) window.
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And at some point, you're going to demand a job too, right?
"Before entering on an understanding, I have meditated for a long time, and have foreseen what might happen. It is not genius which reveals to me suddenly, secretly, what I have to say or to do in a circumstance unexpected by other people; it is reflection, it is meditation." - Napoleon I
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You use the resource editor in Visual Studio, which will generate the code for you.
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Message Closed
modified 15-May-23 19:06pm.
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Member 14968771 wrote: no "post (this) at QT forum " -
just do not answer if you do not want to help.
Comments like that are probably what got you kicked off the other sites. If you want help then try a different approach.
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Member 14968771 wrote: DELETED SOLVED
Deleted, really? 
So no one in the future might learn?
"the debugger doesn't tell me anything because this code compiles just fine" - random QA comment
"Facebook is where you tell lies to your friends. Twitter is where you tell the truth to strangers." - chriselst
"I don't drink any more... then again, I don't drink any less." - Mike Mullikins uncle
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In my program I'm using system("") command to add a variable into User variables using reg add. In the future I'll want to update the variable value to something else, but if the variable exists it will prompt the user to input Y/N to override it. Is there a way to automatically give the input instead of the user? I was thinking that maybe I could use system("y"), but it still waits for the input from the user, and then gives the error that y is not a command.
I can't use Windows.h to modify registry, so I want to find a solution to this. Maybe I'll need system("") for something else in the future that will have the same problem with having to input something.
Solution:
Victor Nijegorodov wrote: According to the reg add | Microsoft Docs you can add option /f that will cause the adding the registry entry without prompting for confirmation.
modified 7-Jul-22 7:00am.
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I do not understand how system("") can add a variable to anything. I think we need more details.
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He said he's using system("reg add") to do it. I've never used either one, but I assume it's a way for a program to add something to the registry. I think he's now looking for a way for a program to enter "y" on the user's behalf, perhaps to confirm a system command invoked by system(). But I don't know of a way to fake console input. Do you?
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I thought system("") looked a bit silly. I do wish people would just copy and paste the actual code they are using to make their questions clear.
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system("reg add \"HKEY_CURRENT_USER\\Environment\" /v TestVariable /t REG_EXPAND_SZ /d \"TestValue\"");
Result: "The operation completed successfully."
And the variable is added with the given value.
But then when wanting to update it:
system("reg add \"HKEY_CURRENT_USER\\Environment\" /v TestVariable /t REG_EXPAND_SZ /d \"TestValueUpdated\"");
Result: "Value TestVariable exists, overwrite(Yes/No)?"
If Y is given as input, then "The operation completed successfully.", and the value is updated. But I want to skip the step where the user has to give the Y input, and send it automatically.
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At first I was thinking, well if I can't modify it, what if I try to first delete it and then add it with the new value, but I get in the same situation, and that is I have to give it an input because when you want to delete a variable, you have to input Y/N.
system("reg delete \"HKEY_CURRENT_USER\\Environment\" /v TestVariable");
Result: "Delete the registry value TestVariable (Yes/No)?"
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According to the reg add | Microsoft Docs you can add option /f that will cause the adding the registry entry without prompting for confirmation.
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Yeah, that works. I have no idea how I managed to skip that one line that I needed...
Thanks!
modified 7-Jul-22 7:00am.
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Why are you not using the registry API directly rather than going through (antiquated) system() calls?
"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
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I've been tasked with updating a function which currently reads in a configuration file from disk and populates a structure:
static int LoadFromFile(FILE *Stream, ConfigStructure *cs)
{
int tempInt;
...
if ( fscanf( Stream, "Version: %d\n",&tempInt) != 1 )
{
printf("Unable to read version number\n");
return 0;
}
cs->Version = tempInt;
...
}
to one which allows us to bypass writing the configuration to disk and instead pass it directly in memory, roughly equivalent to this:
static int LoadFromString(char *Stream, ConfigStructure *cs)
A couple of things to note:
• The current LoadFromFile function is incredibly dense and complex, reading dozens of versions of the config file in a backward-compatible manner, which makes duplication of the overall logic quite a pain.
• The functions that generate the config file and those that read it originate in totally different parts of the old system and therefore don't share any data structures so I can't pass those directly. I could potentially write a wrapper, but again, it would need to handle any structure passed in a backward-compatible manner.
• I'm tempted to just pass the file as is in as a string (as in the prototype above) and convert all the fscanf's to sscanf's but then I have to handle incrementing the pointer along (and potentially dealing with buffer overrun errors) manually.
• This has to remain in C, so no C++ functionality like streams can help here
Am I missing a superior choice? Is there a good method for making a FILE * that simply focuses to an area in memory rather than on a disk? Any pointers, ideas or other assistance is enormously valuable.
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Your LoadFromString method could write the string to a temporary file, open the file for input and pass the FILE* to LoadFromFile. That way you would not require any changes to the existing code.
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sahil Ranka wrote: Is there a good method for making a FILE * that simply focuses to an area in memory rather than on a disk?
Is mmap() of any value here?
"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
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I need to do the following request within a C++ app (response is json):
curl --header "x-api-key:ABCD" -s https:
1. Can I replace curl with another protocol ? (This is not mandatory, could be as it is now)
2. Is there a header only c++ lib that can complete this request ? Of course, I know there is REST SDK library, but it is too much trouble for that simple request.
Thank you.
modified 4-Jul-22 10:07am.
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curl isn't a protocol, as such, but a CLI tool for data transfer using urls. The underpinnings are based on libcurl, a C library, that implements the data trasfer. As such, you can make API calls directly from your C++ program. Another option would be to look into popen() e.g.
#include <cstdio>
int main()
{
FILE *pipe = popen("curl --header \"x-api-key:ABCD\" -s https://api.test.se/api/mydata", "r");
while( {
}
fclose(pipe);
}
Keep Calm and Carry On
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Hmm ... I tried:
FILE* pipe = _popen("curl --header \"x-api-key:ABCD\" -s https://api.test.se/api/mydata", "r");
while (true)
{
pipe->_Placeholder;
break;
}
fclose(pipe);
but I cannot retrieved any data from pipe ...
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using a C style FILE * you have to use C stdio functions. So for example you could do
#include <stdio>
#include <cstdlib>
FILE *pipe = popen( ... );
char *buff = NULL;
size_t blen = 0;
while( getline(&buff, &blen, pipe) > 0) {
}
free(buff);
I generally prefer getline() to fgets() when using cstdio because it allocates and grows the input buffer as needed.
If you wish to stick with a more C++ style interface, then maybe look into Boost.Process
I think you've mentioned QT as part of your framework, so there's QProcess as well.
Keep Calm and Carry On
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The C++ app is MFC app ...
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