code_app/modules/saneui/dialog_source_select.cpp

#include "dialog_source_select.h"
#include "ui_dialog_source_select.h"
#include <QMessageBox>

Dialog_Source_Select::Dialog_Source_Select(const char **manuNames, const char **sanePaths, QWidget *parent) :
    QDialog(parent),
    ui(new Ui::Dialog_Source_Select)
{
    ui->setupUi(this);

    m_vSource.clear();
    m_strManuName.clear();
    m_dll = nullptr;
    memset(&m_saneApi, 0, sizeof(SANEAPI));

    setWindowFlags(Qt::Dialog | Qt::WindowCloseButtonHint);

    const char **p1 = manuNames;
    const char **p2 = sanePaths;
    while (*p1 != NULL && *p2 != NULL)
    {
        std::pair<std::string, std::string> pr;
        pr.first = *p1;
        pr.second = *p2;
        m_vSource.push_back(pr);
        ui->listWidget->addItem(*p1);
        ++p1;
        ++p2;
    }

    if (!m_vSource.empty())
    {
        ui->listWidget->setCurrentRow(0);
    }
}

Dialog_Source_Select::~Dialog_Source_Select()
{
    delete ui;
}

std::string Dialog_Source_Select::GetManuName()
{
    return m_strManuName;
}

HGDll Dialog_Source_Select::GetDll()
{
    return m_dll;
}

void Dialog_Source_Select::GetSaneAPI(SANEAPI *saneAPI)
{
    memcpy(saneAPI, &m_saneApi, sizeof(SANEAPI));
}

void Dialog_Source_Select::on_pushButton_OK_clicked()
{
    int index = ui->listWidget->currentRow();
    if (index < 0)
    {
        return;
    }

    HGDll dll = nullptr;
    HGResult ret = HGBase_CreateDll(m_vSource[index].second.c_str(), &dll);
    if (HGBASE_ERR_OK != ret)
    {
        QMessageBox::information(this, tr("tips"), tr("Load library failed"));
        return;
    }

    SANEAPI saneAPI;
    ret = FindFunctions(dll, m_vSource[index].first.c_str(), &saneAPI);
    if (HGBASE_ERR_OK != ret)
    {
        HGBase_DestroyDll(dll);
        dll = NULL;
        QMessageBox::information(this, tr("tips"), tr("Find function failed"));
        return;
    }

    m_strManuName = m_vSource[index].first;
    m_dll = dll;
    memcpy(&m_saneApi, &saneAPI, sizeof(SANEAPI));
    accept();
}

void Dialog_Source_Select::on_pushButton_Cancel_clicked()
{
    reject();
}

HGResult Dialog_Source_Select::FindFunctions(HGDll dll, const HGChar* saneManu, SANEAPI *saneAPI)
{
    HGResult ret = HGBASE_ERR_OK;

    do
    {
        HGChar funcName[256];

        sprintf(funcName, "sane_%s_init", saneManu);
        ret = HGBase_GetDllProcAddress(dll, funcName, (HGPointer*)&saneAPI->sane_init_api);
        if (HGBASE_ERR_OK != ret)
            break;

        sprintf(funcName, "sane_%s_exit", saneManu);
        ret = HGBase_GetDllProcAddress(dll, funcName, (HGPointer*)&saneAPI->sane_exit_api);
        if (HGBASE_ERR_OK != ret)
            break;

        sprintf(funcName, "sane_%s_get_devices", saneManu);
        ret = HGBase_GetDllProcAddress(dll, funcName, (HGPointer*)&saneAPI->sane_get_devices_api);
        if (HGBASE_ERR_OK != ret)
            break;

        sprintf(funcName, "sane_%s_open", saneManu);
        ret = HGBase_GetDllProcAddress(dll, funcName, (HGPointer*)&saneAPI->sane_open_api);
        if (HGBASE_ERR_OK != ret)
            break;

        sprintf(funcName, "sane_%s_close", saneManu);
        ret = HGBase_GetDllProcAddress(dll, funcName, (HGPointer*)&saneAPI->sane_close_api);
        if (HGBASE_ERR_OK != ret)
            break;

        sprintf(funcName, "sane_%s_start", saneManu);
        ret = HGBase_GetDllProcAddress(dll, funcName, (HGPointer*)&saneAPI->sane_start_api);
        if (HGBASE_ERR_OK != ret)
            break;

        sprintf(funcName, "sane_%s_read", saneManu);
        ret = HGBase_GetDllProcAddress(dll, funcName, (HGPointer*)&saneAPI->sane_read_api);
        if (HGBASE_ERR_OK != ret)
            break;

        sprintf(funcName, "sane_%s_cancel", saneManu);
        ret = HGBase_GetDllProcAddress(dll, funcName, (HGPointer*)&saneAPI->sane_cancel_api);
        if (HGBASE_ERR_OK != ret)
            break;

        sprintf(funcName, "sane_%s_set_io_mode", saneManu);
        ret = HGBase_GetDllProcAddress(dll, funcName, (HGPointer*)&saneAPI->sane_set_io_mode_api);
        if (HGBASE_ERR_OK != ret)
            break;

        sprintf(funcName, "sane_%s_strstatus", saneManu);
        ret = HGBase_GetDllProcAddress(dll, funcName, (HGPointer*)&saneAPI->sane_strstatus_api);
        if (HGBASE_ERR_OK != ret)
            break;

        sprintf(funcName, "sane_%s_get_parameters", saneManu);
        ret = HGBase_GetDllProcAddress(dll, funcName, (HGPointer*)&saneAPI->sane_get_parameters_api);
        if (HGBASE_ERR_OK != ret)
            break;

        sprintf(funcName, "sane_%s_get_option_descriptor", saneManu);
        ret = HGBase_GetDllProcAddress(dll, funcName, (HGPointer*)&saneAPI->sane_get_option_descriptor_api);
        if (HGBASE_ERR_OK != ret)
            break;

        sprintf(funcName, "sane_%s_control_option", saneManu);
        ret = HGBase_GetDllProcAddress(dll, funcName, (HGPointer*)&saneAPI->sane_control_option_api);
        if (HGBASE_ERR_OK != ret)
            break;

        sprintf(funcName, "sane_%s_io_control", saneManu);
        ret = HGBase_GetDllProcAddress(dll, funcName, (HGPointer*)&saneAPI->sane_io_control_api);
        if (HGBASE_ERR_OK != ret)
            break;

    } while (0);

    return ret;
}