[GDI PLUS and win32] - why i only get a black image?

Question

heres my image class:
class image
private:
ULONG_PTR m_gdiplusToken;
Gdiplus::GdiplusStartupInput gdiplusStartupInput;
HDC hdcimage=CreateCompatibleDC(NULL);
Gdiplus::Graphics *graphic;
Image *img;
int imageheight=0;
int imageweight=0;
int framecount=0;
int intSelectFrame=0;
int framedelay=0;
string strfilename="";
Gdiplus::Color clrBackColor=Gdiplus::Color::Transparent;
HDC hdcwindow;
bool blnTransparent=true;
public:
image()
Gdiplus::GdiplusStartup(&m_gdiplusToken, &gdiplusStartupInput, NULL);
HBITMAP hbitmap=CreateCompatibleBitmap(hdcimage,1,1);
SelectObject(hdcimage, hbitmap);
image(HDC hdcWindow)
Gdiplus::GdiplusStartup(&m_gdiplusToken, &gdiplusStartupInput, NULL);
hdcwindow=hdcWindow;
image(int width, int height)
Gdiplus::GdiplusStartup(&m_gdiplusToken, &gdiplusStartupInput, NULL);
hdcimage = CreateCompatibleDC(NULL);
HBITMAP hbitmap=CreateCompatibleBitmap(hdcimage,width,height);
SelectObject(hdcimage, hbitmap);
framecount=1;
image( const string & filename)
Gdiplus::GdiplusStartup(&m_gdiplusToken, &gdiplusStartupInput, NULL);
if(toupper(filename[filename.size()-3])=='C' && toupper(filename[filename.size()-2])=='U' && toupper(filename[filename.size()-1])=='R')
//create the transparent icon handle
HCURSOR hicon = (HCURSOR)LoadImage(NULL, filename.c_str(), IMAGE_CURSOR, imageweight, imageheight, LR_LOADFROMFILE|LR_SHARED|LR_DEFAULTSIZE|LR_LOADTRANSPARENT);
ICONINFO ii;
BOOL fResult = GetIconInfo(hicon, &ii);
if (fResult)
BITMAP bm;
fResult = GetObject(ii.hbmMask, sizeof(bm), &bm) == sizeof(bm);
if (fResult)
imageweight= bm.bmWidth;
imageheight= ii.hbmColor ? bm.bmHeight : bm.bmHeight / 2;
if (ii.hbmMask) DeleteObject(ii.hbmMask);
if (ii.hbmColor) DeleteObject(ii.hbmColor);
HBITMAP hbitmap=CreateBitmap(imageweight,imageheight,1,32,NULL);//create the bitmap with icon size
SelectObject(hdcimage, hbitmap);//add the bitmap to memory DC
DrawIconEx(hdcimage,0,0,hicon,imageweight,imageheight,0,0,DI_NORMAL);//draw the icon to DC with right size
//seems the DrawIcon(), always, draw it with 32X32 size
framecount=1;
else
Gdiplus::Image img2(towstring(filename).c_str());
HBITMAP hbitmap=CreateBitmap(img2.GetWidth(),img2.GetHeight(),1,32,NULL);
SelectObject(hdcimage, hbitmap);
Gdiplus::Graphics graphics(hdcimage);
graphics.DrawImage(&img2, 0, 0, img2.GetWidth(), img2.GetHeight());
Gdiplus::Font fnt(L"Verdana", 10);
Gdiplus::SolidBrush solidBrush(Gdiplus::Color(255, 255, 0, 0));
Gdiplus::PointF pt(2, 2);
Gdiplus::Pen pen(Gdiplus::Color(255,0,255,0));
graphics.DrawString(L"Drawing Text", -1,&fnt, pt,&solidBrush );
graphics.DrawLine(&pen, 0, 0, 200, 100);
imageweight=img2.GetWidth();
imageheight=img2.GetHeight();
UINT count = 0;
count = img2.GetFrameDimensionsCount();
GUID* pDimensionIDs = (GUID*)malloc(sizeof(GUID)*count);
img2.GetFrameDimensionsList(pDimensionIDs, count);
framecount=img2.GetFrameCount(&pDimensionIDs[0]);
framedelay =img2.GetPropertyItemSize(PropertyTagFrameDelay);
img=new Image(towstring(filename).c_str());
image (const image &cSource)
framecount=cSource.framecount;
framedelay=cSource.framedelay;
clrBackColor=cSource.clrBackColor;
img=cSource.img->Clone();
imageweight=cSource.imageweight;
imageheight=cSource.imageheight;
BitBlt(hdcimage,0,0,imageweight,imageheight,cSource.hdcimage,0,0,SRCCOPY);
image& operator= (const image &cSource)
framecount=cSource.framecount;
framedelay=cSource.framedelay;
intSelectFrame=cSource.intSelectFrame;
clrBackColor=cSource.clrBackColor;
imageweight=cSource.imageweight;
imageheight=cSource.imageheight;
BitBlt(hdcimage,0,0,imageweight,imageheight,cSource.hdcimage,0,0,SRCCOPY);
return *this;
property <int> SelectFrame
Get(int)
return intSelectFrame;
Set(int selectframe)
intSelectFrame=selectframe;
UINT count = 0;
count = img->GetFrameDimensionsCount();
GUID* pDimensionIDs = (GUID*)malloc(sizeof(GUID)*count);
img->GetFrameDimensionsList(pDimensionIDs, count);
img->SelectActiveFrame(&pDimensionIDs[0],intSelectFrame);
graphic=new Graphics(hdcimage);
graphic->Clear(clrBackColor);
graphic->DrawImage(img, 0, 0, img->GetWidth(), img->GetHeight());
property<int> FramesCount
Get(int)
return framecount;
property<Gdiplus::Color> Backcolor
Get(Gdiplus::Color)
return clrBackColor;
Set(Gdiplus::Color bkcolor)
clrBackColor = bkcolor;
SetDCBrushColor(hdcimage,clrBackColor.ToCOLORREF());
void draw(HDC control)
//if (clrBackColor.GetValue() == Gdiplus::Color::Transparent)
if (clrBackColor.GetValue()== Gdiplus::Color::Transparent)
TransparentBlt(control, 0, 0,width(),height(),hdcimage, 0, 0,width(), height(), GetPixel(hdcimage,width()-1,height()-1));
else
BitBlt(control,0,0,width(),height(),hdcimage,0,0,SRCCOPY);
//InvalidateRect(WindowFromDC(control),NULL,false);
operator HBITMAP()
HBITMAP hbitmap=CreateBitmap(imageweight,imageheight,1,32,NULL);//create the bitmap with icon size
SelectObject(hdcimage, hbitmap);//add the bitmap to memory DC
MessageBox(NULL,to_string(GetLastError()).c_str(),"error",MB_OK);
return hbitmap;
int height()
return imageheight;
int width()
return imageweight;
operator HDC()
return hdcimage;
~image()
delete img;
Gdiplus::GdiplusShutdown(m_gdiplusToken);
//SelectObject(hdcimage, hbmOld);
DeleteDC(hdcimage);
when i create an image object i must put a file name. now i need show it on menus, by HBITMAP. so i did:
operator HBITMAP()
HBITMAP hbitmap=CreateBitmap(imageweight,imageheight,1,32,NULL);//create the bitmap with icon size
SelectObject(hdcimage, hbitmap);//add the bitmap to memory DC
MessageBox(NULL,to_string(GetLastError()).c_str(),"error",MB_OK);
return hbitmap;
//on menus
void bitmap(image imgImage)
//HBITMAP bitimage = (HBITMAP)LoadImage( NULL, filename.c_str(), IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
HMENU hMenu = NULL;
if(primeiromenu)
hMenu = mnuBar;
else
hMenu = MenuHandle;
SetMenuItemBitmaps(hMenu,menuposition,MF_BYPOSITION ,(HBITMAP)imgImage ,(HBITMAP)imgImage);
i don't get any errors. my problem is: why i get only a black color?
when i do:
SelectObject(hdcimage, hbitmap);
is copy everything from HDC to hbitmap, right?

Answer 1

now works fine. thanks for all
class image
private:
ULONG_PTR m_gdiplusToken;
Gdiplus::GdiplusStartupInput gdiplusStartupInput;
HDC hdcimage=CreateCompatibleDC(NULL);
HGDIOBJ obj=NULL;
HBITMAP btBitmap;
Image *img;
int imageheight=0;
int imageweight=0;
int framecount=0;
int intSelectFrame=0;
int framedelay=0;
string strfilename="";
Gdiplus::Color clrBackColor=Gdiplus::Color::Transparent;
HDC hdcwindow;
bool blnTransparent=true;
public:
image()
Gdiplus::GdiplusStartup(&m_gdiplusToken, &gdiplusStartupInput, NULL);
btBitmap=CreateCompatibleBitmap(hdcimage,1,1);
obj = SelectObject(hdcimage, btBitmap);
image(HDC hdcWindow)
Gdiplus::GdiplusStartup(&m_gdiplusToken, &gdiplusStartupInput, NULL);
hdcwindow=hdcWindow;
image(int width, int height)
Gdiplus::GdiplusStartup(&m_gdiplusToken, &gdiplusStartupInput, NULL);
hdcimage = CreateCompatibleDC(NULL);
btBitmap = CreateCompatibleBitmap(hdcimage,width,height);
obj = SelectObject(hdcimage, btBitmap);
framecount=1;
image( const string & filename)
strfilename=filename;
Gdiplus::GdiplusStartup(&m_gdiplusToken, &gdiplusStartupInput, NULL);
if(toupper(filename[filename.size()-3])=='C' && toupper(filename[filename.size()-2])=='U' && toupper(filename[filename.size()-1])=='R')
//create the transparent icon handle
HCURSOR hicon = (HCURSOR)LoadImage(NULL, filename.c_str(), IMAGE_CURSOR, imageweight, imageheight, LR_LOADFROMFILE|LR_SHARED|LR_DEFAULTSIZE|LR_LOADTRANSPARENT);
ICONINFO ii;
BOOL fResult = GetIconInfo(hicon, &ii);
if (fResult)
BITMAP bm;
fResult = GetObject(ii.hbmMask, sizeof(bm), &bm) == sizeof(bm);
if (fResult)
imageweight= bm.bmWidth;
imageheight= ii.hbmColor ? bm.bmHeight : bm.bmHeight / 2;
if (ii.hbmMask) DeleteObject(ii.hbmMask);
if (ii.hbmColor) DeleteObject(ii.hbmColor);
btBitmap=CreateBitmap(imageweight,imageheight,1,32,NULL);//create the bitmap with icon size
obj = SelectObject(hdcimage, btBitmap);//add the bitmap to memory DC
DrawIconEx(hdcimage,0,0,hicon,imageweight,imageheight,0,0,DI_NORMAL);//draw the icon to DC with right size
//seems the DrawIcon(), always, draw it with 32X32 size
framecount=1;
DestroyCursor(hicon);
else
Gdiplus::Image img2(towstring(filename).c_str());
btBitmap=CreateBitmap(img2.GetWidth(),img2.GetHeight(),1,32,NULL);
obj = SelectObject(hdcimage, btBitmap);
Gdiplus::Graphics graphics(hdcimage);
graphics.DrawImage(&img2, 0, 0, img2.GetWidth(), img2.GetHeight());
imageweight=img2.GetWidth();
imageheight=img2.GetHeight();
UINT count = 0;
count = img2.GetFrameDimensionsCount();
GUID* pDimensionIDs = (GUID*)malloc(sizeof(GUID)*count);
img2.GetFrameDimensionsList(pDimensionIDs, count);
framecount=img2.GetFrameCount(&pDimensionIDs[0]);
if (framecount>1)
framedelay =img2.GetPropertyItemSize(PropertyTagFrameDelay);
else
framedelay =0;
img=new Image(towstring(filename).c_str());
free(pDimensionIDs);
image (const image &cSource)
Gdiplus::GdiplusStartup(&m_gdiplusToken, &gdiplusStartupInput, NULL);
framecount=cSource.framecount;
framedelay=cSource.framedelay;
clrBackColor=cSource.clrBackColor;
img=cSource.img->Clone();
imageweight=cSource.imageweight;
imageheight=cSource.imageheight;
strfilename=cSource.strfilename;
btBitmap=CreateBitmap(imageweight,imageweight,1,32,NULL);
obj = SelectObject(hdcimage, btBitmap);
BitBlt(hdcimage,0,0,imageweight,imageheight,cSource.hdcimage,0,0,SRCCOPY);
image& operator= (const image &cSource)
Gdiplus::GdiplusStartup(&m_gdiplusToken, &gdiplusStartupInput, NULL);
framecount=cSource.framecount;
framedelay=cSource.framedelay;
clrBackColor=cSource.clrBackColor;
img=cSource.img->Clone();
imageweight=cSource.imageweight;
imageheight=cSource.imageheight;
strfilename=cSource.strfilename;
btBitmap=CreateBitmap(imageweight,imageweight,1,32,NULL);
obj = SelectObject(hdcimage, btBitmap);
BitBlt(hdcimage,0,0,imageweight,imageheight,cSource.hdcimage,0,0,SRCCOPY);
return *this;
property <int> SelectFrame
Get(int)
return intSelectFrame;
Set(int selectframe)
intSelectFrame=selectframe;
UINT count = 0;
count = img->GetFrameDimensionsCount();
GUID* pDimensionIDs = (GUID*)malloc(sizeof(GUID)*count);
img->GetFrameDimensionsList(pDimensionIDs, count);
img->SelectActiveFrame(&pDimensionIDs[0],intSelectFrame);
Gdiplus::Graphics graphics(hdcimage);
graphics.Clear(clrBackColor);
graphics.DrawImage(img, 0, 0, img->GetWidth(), img->GetHeight());
free(pDimensionIDs);
property<int> FramesCount
Get(int)
return framecount;
property<string> FileName
Get(string)
return strfilename;
Set(string filename)
delete img;
DeleteObject(btBitmap);
DeleteObject(obj);
strfilename=filename;
if(toupper(filename[filename.size()-3])=='C' && toupper(filename[filename.size()-2])=='U' && toupper(filename[filename.size()-1])=='R')
//create the transparent icon handle
HCURSOR hicon = (HCURSOR)LoadImage(NULL, filename.c_str(), IMAGE_CURSOR, imageweight, imageheight, LR_LOADFROMFILE|LR_SHARED|LR_DEFAULTSIZE|LR_LOADTRANSPARENT);
ICONINFO ii;
BOOL fResult = GetIconInfo(hicon, &ii);
if (fResult)
BITMAP bm;
fResult = GetObject(ii.hbmMask, sizeof(bm), &bm) == sizeof(bm);
if (fResult)
imageweight= bm.bmWidth;
imageheight= ii.hbmColor ? bm.bmHeight : bm.bmHeight / 2;
if (ii.hbmMask) DeleteObject(ii.hbmMask);
if (ii.hbmColor) DeleteObject(ii.hbmColor);
btBitmap=CreateBitmap(imageweight,imageheight,1,32,NULL);//create the bitmap with icon size
obj = SelectObject(hdcimage, btBitmap);//add the bitmap to memory DC
DrawIconEx(hdcimage,0,0,hicon,imageweight,imageheight,0,0,DI_NORMAL);//draw the icon to DC with right size
//seems the DrawIcon(), always, draw it with 32X32 size
framecount=1;
DestroyCursor(hicon);
else
Gdiplus::Image img2(towstring(filename).c_str());
btBitmap=CreateBitmap(img2.GetWidth(),img2.GetHeight(),1,32,NULL);
obj = SelectObject(hdcimage, btBitmap);
Gdiplus::Graphics graphics(hdcimage);
graphics.DrawImage(&img2, 0,0,img2.GetWidth(),img2.GetHeight());
imageweight=img2.GetWidth();
imageheight=img2.GetHeight();
UINT count = 0;
count = img2.GetFrameDimensionsCount();
GUID* pDimensionIDs = (GUID*)malloc(sizeof(GUID)*count);
img2.GetFrameDimensionsList(pDimensionIDs, count);
framecount=img2.GetFrameCount(&pDimensionIDs[0]);
framedelay =img2.GetPropertyItemSize(PropertyTagFrameDelay);
img=new Image(towstring(filename).c_str());
free(pDimensionIDs);
property<Gdiplus::Color> Backcolor
Get(Gdiplus::Color)
return clrBackColor;
Set(Gdiplus::Color bkcolor)
clrBackColor = bkcolor;
SetDCBrushColor(hdcimage,clrBackColor.ToCOLORREF());
void draw(HDC control)
//if (clrBackColor.GetValue() == Gdiplus::Color::Transparent)
if (clrBackColor.GetValue()== Gdiplus::Color::Transparent)
TransparentBlt(control, 0, 0,width(),height(),hdcimage, 0, 0,width(), height(), GetPixel(hdcimage,width()-1,height()-1));
else
BitBlt(control,0,0,width(),height(),hdcimage,0,0,SRCCOPY);
//InvalidateRect(WindowFromDC(control),NULL,false);
operator HBITMAP()
return btBitmap;
int height()
return imageheight;
int width()
return imageweight;
operator HDC()
return hdcimage;
~image()
//delete graphic; //isn't needed, because i, now, don't use it //and i don't use the new keyword
DeleteObject(obj);
delete img;
Gdiplus::GdiplusShutdown(m_gdiplusToken);
//DeleteObject(btBitmap);//don't show me the image. so isn't need too
DeleteDC(hdcimage);
thanks for all