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我正在为名为 MusicBee 的音乐播放器编写一个插件。该插件适用于罗技 G 键盘 LCD。对于 Logitech G19 键盘，我将从位图文件中添加漂亮的背景。sdk说我必须使用HBITMAP来创建背景。现在我使用 HBITMAP 并且背景不显示。这是插件主页上的背景和徽标的代码。

m_lcd.ModifyDisplay(LG_COLOR);
    background =(HBITMAP) LoadImage( NULL, L"Logitech/G19logo.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
    m_lcd.SetBackground(background);
    logo = m_lcd.AddText(LG_STATIC_TEXT, LG_BIG, DT_CENTER, LGLCD_QVGA_BMP_WIDTH);
    m_lcd.SetOrigin(logo, 0, 50);
    m_lcd.SetText(logo, _T("MusicBee"));
    m_lcd.SetTextFontColor(logo, RGB(0,0,0));
    m_lcd.Update();

我的罗技课程的完整代码：

//-----------------------------------------------------------------
// Logitech File
// C++ Source - Logitech.cpp - version 2012 v1.0
//-----------------------------------------------------------------

//-----------------------------------------------------------------
// Include Files
//-----------------------------------------------------------------
#include "stdafx.h"
#include "Logitech.h"

//-----------------------------------------------------------------
// Logitech methods
//-----------------------------------------------------------------


//This LogitechObject is a instance of the Logitech class for using in the thread
Logitech * Logitech::LogitechObject;

Logitech::Logitech():   stopthread(false), firstTime(true), position(0), duration(0)
{
    LogitechObject = this;
}

Logitech::~Logitech()
{
    stopthread = true;
    this->state = StatePlay::Undefined;
    timerThread.detach();
}

void CALLBACK Logitech::TimerProc(void* lpParameter, BOOLEAN TimerOrWaitFired)
{
    if(LogitechObject->m_lcd.ButtonTriggered(LG_BUTTON_4))
    {
    LogitechObject->time = 0;
    LogitechObject->m_lcd.SetProgressBarPosition(LogitechObject->progressbar, static_cast<FLOAT>(100));
    LogitechObject->m_lcd.Update();
    }
}

bool Logitech::getFirstTime()
{
    return firstTime;
}

//Initialise Logitech LCD
BOOL Logitech::OnInitDialog()
{
    HRESULT hRes = m_lcd.Initialize(_T("MusicBee"), LG_DUAL_MODE, FALSE, TRUE);

    if (hRes != S_OK)
    {
        return FALSE;
    }

    m_lcd.SetAsForeground(true);

    //Create home screen Logitech Color LCD
    if(m_lcd.IsDeviceAvailable(LG_COLOR))
    {
        m_lcd.ModifyDisplay(LG_COLOR);
        //m_lcd.SetBackground(RGB(245,245,245));
        background =(HBITMAP) LoadImage( NULL, L"Logitech/G19logo.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
        m_lcd.SetBackground(background);
        logo = m_lcd.AddText(LG_STATIC_TEXT, LG_BIG, DT_CENTER, LGLCD_QVGA_BMP_WIDTH);
        m_lcd.SetOrigin(logo, 0, 50);
        m_lcd.SetText(logo, _T("MusicBee"));
        m_lcd.SetTextFontColor(logo, RGB(0,0,0));
        m_lcd.Update();
    }

    //Create home screen Logitech Monochrome LCD
    else if(m_lcd.IsDeviceAvailable(LG_MONOCHROME))
    {
        m_lcd.ModifyDisplay(LG_MONOCHROME);
        logo = m_lcd.AddText(LG_STATIC_TEXT, LG_BIG, DT_CENTER, LGLCD_BW_BMP_WIDTH);
        m_lcd.SetOrigin(logo, 0, 5);
        m_lcd.SetText(logo, _T("MusicBee"));
        m_lcd.Update();
    }

    //Start thread
    timerThread = thread(&Logitech::startThread);

    //CreateTimerQueueTimer(NULL,NULL,&Logitech::TimerProc,this,0,1250,WT_EXECUTEDEFAULT);

    return TRUE;  // return TRUE  unless you set the focus to a control
}

//Create playing screen for Logitech Monochrome LCD
VOID Logitech::createMonochrome()
{
    m_lcd.RemovePage(0);
    m_lcd.AddNewPage();
    m_lcd.ShowPage(0);

    if (logo != 0)
    {
        delete logo;
        logo = 0;
    }

    artist = m_lcd.AddText(LG_SCROLLING_TEXT, LG_MEDIUM, DT_CENTER, LGLCD_BW_BMP_WIDTH);
    m_lcd.SetOrigin(artist, 0, 0);

    title = m_lcd.AddText(LG_SCROLLING_TEXT, LG_MEDIUM, DT_CENTER, LGLCD_BW_BMP_WIDTH);
    m_lcd.SetOrigin(title, 0, 13);

    progressbar = m_lcd.AddProgressBar(LG_FILLED);
    m_lcd.SetProgressBarSize(progressbar, 136, 5);
    m_lcd.SetOrigin(progressbar, 12, 38);

    time = m_lcd.AddText(LG_STATIC_TEXT, LG_SMALL, DT_LEFT, 80);
    m_lcd.SetOrigin(time, 12, 29);

    time1 = m_lcd.AddText(LG_STATIC_TEXT, LG_SMALL, DT_LEFT, 80);
    m_lcd.SetOrigin(time1, 125, 29);

    /*      playIcon = static_cast<HICON>(LoadImage(GetModuleHandle(NULL), MAKEINTRESOURCE(IDB_PNG2), IMAGE_BITMAP, 16, 16, LR_MONOCHROME));
    playIconHandle = m_lcd.AddIcon(playIcon, 16, 16);
    m_lcd.SetOrigin(playIconHandle, 2, 29);*/

    firstTime = false;
    changeArtistTitle(this->artistString, this->albumString, this->titleString, this->duration, this->position);
}

//Create playing screen for Logitech Color LCD
VOID Logitech::createColor()
{
    m_lcd.RemovePage(0);
    m_lcd.AddNewPage();
    m_lcd.ShowPage(0);

    if (logo != 0)
    {
        delete logo;
        logo = 0;
    }

    //background.LoadFromResource(NULL, AfxGetInstanceHandle(), IDB_BITMAP2, _T("BMP"));
    background =(HBITMAP) LoadImage( NULL, L"Logitech/G19Background.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);

    //HBITMAP bmpBkg_ = background.GetHBITMAP();
    m_lcd.SetBackground(background);

    //m_lcd.SetBackground(RGB(184,220,240));

    artist = m_lcd.AddText(LG_SCROLLING_TEXT, LG_MEDIUM, DT_CENTER, LGLCD_QVGA_BMP_WIDTH);
    m_lcd.SetOrigin(artist, 5, 5);
    m_lcd.SetTextFontColor(artist, RGB(0,0,0));

    album = m_lcd.AddText(LG_SCROLLING_TEXT, LG_MEDIUM, DT_CENTER, LGLCD_QVGA_BMP_WIDTH);
    m_lcd.SetOrigin(album, 5, 30);
    m_lcd.SetTextFontColor(album, RGB(0,0,0));

    title = m_lcd.AddText(LG_SCROLLING_TEXT, LG_MEDIUM, DT_CENTER, LGLCD_QVGA_BMP_WIDTH);
    m_lcd.SetOrigin(title, 5, 55);
    m_lcd.SetTextFontColor(title, RGB(0,0,0));

    time = m_lcd.AddText(LG_STATIC_TEXT, LG_SMALL, DT_LEFT, 80);
    m_lcd.SetOrigin(time, 5, 80);
    m_lcd.SetTextFontColor(time, RGB(0,0,0));

    time1 = m_lcd.AddText(LG_STATIC_TEXT, LG_SMALL, DT_LEFT, 40);
    m_lcd.SetOrigin(time1, 275, 80);
    m_lcd.SetTextFontColor(time1, RGB(0,0,0));

    progressbar = m_lcd.AddProgressBar(LG_FILLED);//320�240 pixel color screen
    m_lcd.SetProgressBarSize(progressbar, 310, 20);
    m_lcd.SetProgressBarColors(progressbar, RGB(25,71,94),NULL);
    m_lcd.SetOrigin(progressbar, 5, 100);

    /*playIcon = static_cast<HICON>(LoadImage(AfxGetInstanceHandle(), MAKEINTRESOURCE(IDB_PNG1), IMAGE_ICON, 16, 16, LR_COLOR));
    playIconHandle = m_lcd.AddIcon(playIcon, 16, 16);
    m_lcd.SetOrigin(playIconHandle, 5, 29);*/

    firstTime = false;
    changeArtistTitle(this->artistString, this->albumString, this->titleString, this->duration, this->position);
}

void Logitech::startThread()
{
    while(!LogitechObject->stopthread)
    {
        this_thread::sleep_for( chrono::milliseconds(500) );

        if(!LogitechObject->stopthread && LogitechObject->progressbar != NULL)
        {
            //Update progressbar and position time on the screen after 1 second of music.
            if(LogitechObject->state == StatePlay::Playing)
            {
                this_thread::sleep_for( chrono::milliseconds(500) );
                LogitechObject->position++;
                float progresstime = ((float)LogitechObject->position / (float)LogitechObject->duration)*100;
                LogitechObject->m_lcd.SetProgressBarPosition(LogitechObject->progressbar, static_cast<FLOAT>(progresstime));
                LogitechObject->m_lcd.SetText(LogitechObject->time, LogitechObject->getTimeString(LogitechObject->position).c_str());
            }

            //If music stopped then the progressbar and time must stop immediately
            else if(LogitechObject->state == StatePlay::Stopped)
            {
                LogitechObject->position = 0;
                LogitechObject->m_lcd.SetProgressBarPosition(LogitechObject->progressbar, 0);
                LogitechObject->m_lcd.SetText(LogitechObject->time, LogitechObject->getTimeString(LogitechObject->position).c_str());
            }

            LogitechObject->m_lcd.Update();
        }
    }
}

void Logitech::changeArtistTitle(wstring artistStr, wstring albumStr, wstring titleStr, int duration, int position)
{
    this->artistString = artistStr;
    this->albumString = albumStr;
    this->titleString = titleStr;
    this->durationString = getTimeString(duration/1000);
    this->position = position;
    this->duration = duration/1000;

    if(!firstTime)
    {
        if(m_lcd.IsDeviceAvailable(LG_COLOR))
        {
            m_lcd.SetText(album, albumStr.c_str());
        }


        m_lcd.SetText(artist, artistStr.c_str());
        m_lcd.SetText(title, titleStr.c_str());
        m_lcd.SetText(time, getTimeString(position).c_str());

        string s( durationString.begin(), durationString.end() );

        if(s.size() < 5)
        {
            s = "0" + s;
        }

        wstring ws( s.begin(), s.end() );

        m_lcd.SetText(time1, ws.c_str());
        ws.clear();

        ///*playIcon = static_cast<HICON>(LoadImage(AfxGetInstanceHandle(), MAKEINTRESOURCE(IDB_PNG1), IMAGE_ICON, 16, 16, LR_COLOR));
        //playIconHandle = m_lcd.AddIcon(playIcon, 16, 16);
        //m_lcd.SetOrigin(playIconHandle, 5, 29);*/

        m_lcd.Update();

        artistStr.clear();
        albumStr.clear();
        titleStr.clear();

    }
}

//Set current playing position
void Logitech::setPosition(int pos)
{
    this->position = pos/1000;
    m_lcd.SetText(time, getTimeString(this->position).c_str());
    m_lcd.Update();
}

void Logitech::setDuration(int duration)
{
    this->duration = duration/1000;
    m_lcd.SetText(time1, getTimeString(this->duration).c_str());
    m_lcd.Update();
}

//Change play state of the current playing song
void Logitech::changeState(StatePlay state)
{
    this->state = state;

    if(state == StatePlay::Playing && firstTime)
    {
        if(m_lcd.IsDeviceAvailable(LG_COLOR))
        {
            createColor();
        }

        else if(m_lcd.IsDeviceAvailable(LG_MONOCHROME))
        {
            createMonochrome();
        }
    }
}


//Change int of time to string
wstring Logitech::getTimeString(int time)
{
    string minutes = to_string((int)time /60);
    string seconds = to_string((int)time%60);

    if(minutes.size() < 2)
    {
        minutes = "0" + minutes;
    }

    if(seconds.size() < 2)
    {
        seconds = "0" + seconds;
    }

    string timeString = minutes + ":" + seconds;

    return wstring( timeString.begin(), timeString.end() );
}

背景nog显示的问题是什么？

4

1 回答 1

0

从您在评论中的回复来看，问题似乎出在 LoadImage 调用上，因此我们现在可以忽略其余代码。在 LoadImage调用GetLastError失败后立即调用并查看它返回的内容。

像这样的 LoadImage 调用只会出现一些问题：

  • 你可能有错误的文件名。（GetLastError 将返回 ERROR_FILE_NOT_FOUND）
  • 您使用的是相对路径，但当前工作目录可能不是您认为的位置。（GetLastError 将返回 ERROR_FILE_NOT_FOUND 或 ERROR_PATH_NOT_FOUND。）
  • 也许该 API 不能使用斜杠代替反斜杠。
  • 也许您无权读取该文件。（GetLastError 将返回 ERROR_ACCESS_DENIED 或 ERROR_NETWORK_ACCESS_DENIED。）
  • 也许另一个应用程序打开了文件而不共享。（GetLastError 将返回 ERROR_SHARING_VIOLATION。）
  • 也许该文件不是有效的位图。（我不确定 GetLastError 会在这里返回什么。可能类似于 ERROR_INVALID_PARAMETER。）
  • 也许它是一个巨大的位图，没有足够的内存来加载它。（GetLastError 将返回 ERROR_NOT_ENOUGH_MEMORY。）

通常，在调试时，隔离代码中出现问题的点（一旦您知道 LoadImage 失败，您就可以不再担心之后发生的所有代码）。然后尽可能多地获取信息（例如，如果是失败的 Windows API 调用，则调用 GetLastError 并重新读取该 API 的整个 MSDN 页面，使用调试器检查此时的相对状态）。从那里开始，通常会很明显该做什么。如果没有，请编写执行相同步骤的最简单程序。如果可行，请研究您的简单示例和实际代码之间的差异。

于 2013-02-05T21:15:04.397 回答