从资源加载图像不起作用(C++ Dll)
Loading images from resource don't work(C++ Dll)
我正在为MusicBee编写一个Logitech插件。唯一的问题是，美术作品的图像，播放和暂停图像不加载。我已经测试了很多不同的方法来使用VS2012资源文件中的图像。但是没有一个是有效的。我必须在dll文件中加载图像，图像必须是HICON或HBITMAP。下面是我的项目的全部内容。完整的项目可以在Bitbucket上找到。
//This is the code I have used for loading an image.
playIcon = LoadIcon (GetModuleHandle(NULL), MAKEINTRESOURCE(IDI_ICON1));
playIconHandle = m_lcd.AddIcon(playIcon, 16, 16);
m_lcd.SetOrigin(playIconHandle, 2, 2);
//-----------------------------------------------------------------
// 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();
}
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));
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);
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_G19BACKGROUND, _T("PNG"));
//HBITMAP bmpBkg_ = background.GetHBITMAP();
//m_lcd.SetBackground(bmpBkg_);
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() );
}
LoadImage(GetModuleHandle(NULL), ...)
这在插件中是不正确的。GetModuleHandle(NULL)返回一个句柄到EXE，而不是你的DLL。假设您将资源嵌入到插件DLL中，您将需要使用DLL的模块句柄，即您在DllMain()函数中交给您的第一个参数。
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