Is there an example of InputText?

[PrimeraTech]

I have been trying by trial and error to get C# to be happy with my syntax for ImGui.InputText ().

Can anyone provide a single example that will compile and work?

The function prototype is:
public static bool InputText(string label, char* buf, UIntPtr buf_size, ImGuiInputTextFlags flags = (ImGuiInputTextFlags)(0), ImGuiInputTextCallback callback = null, IntPtr user_data = default)

How is a char * variable defined in c# to be compatible with the second parameter?

[PrimeraTech]

The following code compiles but does not work:

string foo = "this is a test";
unsafe
{
ImGui.InputText("xx", (char*)&foo, new UIntPtr(10));
}

[ArneDoering]

You have to work with an array of char, e.g. char[100]. ImGui is zero terminated, so to convert that array back to a string object (when you need it as a string), you have to find the index of (char)0 and then create the string with new string(arr, 0, idx).

the problem is string in C# is immutable, and imgui needs to operate on something mutable, therefore string can't be used and it has to be an array. And then that array has to be passed to imgui the C way by passing the address of the first element and the length. Needs to be done in an unsafe + fixed block.

Propably too late for an answer.

[PrimeraTech]

Thank you for your answer. I appreciate your diligence in working through the questions people have on how to use the software.

…

--Phil Weiss 626-42-6-4436

________________________________ From: ArneDoering ***@***.***> Sent: Wednesday, November 26, 2025 9:28 AM To: aybe/DearImGui ***@***.***> Cc: Philip Weiss ***@***.***>; Author ***@***.***> Subject: Re: [aybe/DearImGui] Is there an example of InputText? (Issue #25) [https://outlook.office.com/mail/AAMkADk1ZmNlYTY3LTFjNTQtNDVmMy1iY2M4LWQ0OWJmNmY2ZjhhYwAuAAAAAACE52kffw8HRrEf0Z8tSkG7AQCedvTmKcehToTID6ooHh7fAAE4eNM4AAA%3D/id/AAkALgAAAAAAHYQDEapmEc2byACqAC%2FEWg0Annb05inHoU6EyA%2BqKB4e3wACwSlEuAAA?nativeVersion=1.2025.1104.200]ArneDoering left a comment (aybe/DearImGui#25)<#25 (comment)> You have to work with an array of char, e.g. char[100]. ImGui is zero terminated, so to convert that array back to a string object (when you need it as a string), you have to find the index of (char)0 and then create the string with new string(arr, 0, idx). the problem is string in C# is immutable, and imgui needs to operate on something mutable, therefore string can't be used and it has to be an array. And then that array has to be passed to imgui the C way by passing the address of the first element and the length. Needs to be done in an unsafe + fixed block. Propably too late for an answer. — Reply to this email directly, view it on GitHub<#25 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/ACYVCDT3XLT2QSUQKST7BKD36XPNPAVCNFSM6AAAAACNJDZDRCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTKOBSGQ2DINRSG4>. You are receiving this because you authored the thread.Message ID: ***@***.***>