非Qt应用程序中的QT dll

Question

I have some problems to distribute my QT class (5.7, msvc) to other developer (He uses borland C++ builder). While loading, my dll application can't find platforms\\qwindows.dll

Can anybody tell me (with examples) how to create dll and use it in other compilers?

This is my way to export some class methods:

#include <string>
#include <QString>
#include "dialog.h"
dialog* dlg;

extern "C" __declspec(dllexport) void DLLInit() {
    int argcc = 0;
    new QApplication(argcc, 0, false);
    dlg = new dialog();
}

extern "C" __declspec(dllexport) void DLLDestroy() {
    delete dlg;
    delete qApp;
}

extern "C" __declspec(dllexport) void setText(std::wstring str){
    dlg->setText(QString::fromWCharArray(str.c_str()));
}

extern "C" __declspec(dllexport) int add(int a, int b){
    return dlg->add(a, b);
}

The file structure seems correct ( qt_form is my dll):

Answer 1

If the EXE is not in the same folder as the Qt libraries, have the EXE call SetDllDirectory with the path of the folder containing your DLL and Qt DLLs.

Or ammend the PATH environment variable to include this folder.