Create a DLL in C and link it to a C ++ project

As in the title, I am trying to create a DLL using C and associate it with a C ++ project. I read and followed various textbooks on the Internet, but every time something is missing, and I do not understand that.

Here is what I did, step by step:

I created a new Win32 project called testlib, then from the wizard I selected "DLL" and "Empty project".

Added caption:

//testlib.h

#include <stdio.h>

__declspec(dllexport) void hello();

Added source; since I want it to be the source of C that I read, I should just rename the .cpp file to .c, so

//testlib.c

#include "testlib.h"

void hello() {
    printf("DLL hello() called\n");
}

Designed by.

Now I would like to use my useful dll in another project.

Then: new project ( testlibUse). This time I selected "Empty project".
No need to add header, just create cpp source

//main.cpp
#include <testlib.h>

int main() {
    hello();
}

Then:

• , testlib.dll "- > V++" → " "

• , testlib.h → V++ →

• testlib.lib ( ) - > Linker- > Input- > Additional dependencies

, :

LINK: C:\path\testlibUse\Debug\testlibUse.exe ;
main.obj: LNK2019: "void __cdecl hello (void)" (? hello @@YAXXZ), _main
C:\path\testlibUse\Debug\testlibUse.exe: LNK1120: 1

testlib, testlib.c testlib.cpp dll, testlibUse, "dll not found".

"Release" ( , ), .

, , , .

?

, - , , DLL Qt?