Anything you type into a text box is a string, whether letters, numbers or special characters. If you want to use numeric text as integer values then you need to convert them with one of the conversion methods. See Data Conversion | Microsoft Docs[^].
SQl is not greater than 1000. I wanted to create a simple application first. Like for example.. I have a table with ID(primary Key), Name, DOB...etc columns.
What I wanted to create is a search box in the dialog application. when I type the Name in the search box it will display the result in the listbox/list control box. Similarly when I enter the ID in the search box it will return the same.
Confidence that I have solved all strange errors here, I come back with some issue generated by a legacy C code for linux, code that I intend to use it in a MFC app in windows OS.
Ok. I have a simple code:
int nRespond = _open(device, 020);
UINT err = ::GetLastError();
where devide is const char* and has value C (or D:, or E: )
The nRespond is -1 and err has value 5, which is mean Access is denied. What could be the problem here ? I ran the test app as administrator mode (ran from VS2017 as admin mode).
The problem appears to be that you are expecting Linux code to work on Windows. The _open function opens a file - on unix systems you can open directories and devices as files, but not on Windows.
If you're lucky the code is actually expecting a normal file and you just passed in a device letter by mistake. Otherwise you will have to port the code, replacing the Linux system functions with code that does the same thing on Windows.
You cannot run Linux code on Windows without adjusting it for the differences. Windows does not let you address raw devices in the same way that Linux does. And in fact doing so is very dangerous as you could destroy your entire system.