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In which sense doesn't it work? Compiler error, crash at run-time? With some more info maybe I can be more helpful.
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
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Dear Joaquín i require little help. The question is related to std::set
I am doing something like this:
std::hash_set<std::string> myset;<br />
std::string country="india";<br />
<br />
myset.insert(country);
But the code above is not working on my VC++ 7.0 compiler. I am getting an error. I am copying below:
c:\Program Files\Microsoft Visual Studio .NET\Vc7\include\xhash(38): error C2440: 'type cast' : cannot convert from 'const std::string' to 'size_t'
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Are you sure you've inserted the appropriate #include <string>? Other than that, I cannot figure out how such a simple piece of code is causing the compiler to go awry.
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
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Sorry, actually the code above is working, but if i use std::hash_set instead of std::set, it does not work. I am writing code below:
using namespace std;
int main(int argc, char* argv[])
{
string name = "india";
hash_set<string> val;
val.insert(name);
return 0;
}
The error i am getting is:
c:\Program Files\Microsoft Visual Studio .NET\Vc7\include\xhash(38): error C2440: 'type cast' : cannot convert from 'const std::string' to 'size_t'
Yes i am including all the required headers.
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how to add entry to personnel address book programatically
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Hello,
I'm using following function :
-----------------------------------------------------------------------
void DrawTransparentBitmap(HDC hdc, HBITMAP hBitmap, int xStart,
int yStart, COLORREF cTransparentColor)
{
BITMAP bm;
COLORREF cColor;
HBITMAP bmAndBack, bmAndObject, bmAndMem, bmSave;
HBITMAP bmBackOld, bmObjectOld, bmMemOld, bmSaveOld;
HDC hdcMem, hdcBack, hdcObject, hdcTemp, hdcSave;
POINT ptSize;
hdcTemp = CreateCompatibleDC(hdc);
SelectObject(hdcTemp, hBitmap); // Select the bitmap
GetObject(hBitmap, sizeof(BITMAP), (LPSTR)&bm);
ptSize.x = bm.bmWidth; // Get width of bitmap
ptSize.y = bm.bmHeight; // Get height of bitmap
DPtoLP(hdcTemp, &ptSize, 1); // Convert from device
// to logical points
// Create some DCs to hold temporary data.
hdcBack = CreateCompatibleDC(hdc);
hdcObject = CreateCompatibleDC(hdc);
hdcMem = CreateCompatibleDC(hdc);
hdcSave = CreateCompatibleDC(hdc);
// Create a bitmap for each DC. DCs are required for a number of
// GDI functions.
// Monochrome DC
bmAndBack = CreateBitmap(ptSize.x, ptSize.y, 1, 1, NULL);
// Monochrome DC
bmAndObject = CreateBitmap(ptSize.x, ptSize.y, 1, 1, NULL);
bmAndMem = CreateCompatibleBitmap(hdc, ptSize.x, ptSize.y);
bmSave = CreateCompatibleBitmap(hdc, ptSize.x, ptSize.y);
// Each DC must select a bitmap object to store pixel data.
bmBackOld = (HBITMAP)SelectObject(hdcBack, bmAndBack);
bmObjectOld = (HBITMAP)SelectObject(hdcObject, bmAndObject);
bmMemOld = (HBITMAP)SelectObject(hdcMem, bmAndMem);
bmSaveOld = (HBITMAP)SelectObject(hdcSave, bmSave);
// Set proper mapping mode.
SetMapMode(hdcTemp, GetMapMode(hdc));
// Save the bitmap sent here, because it will be overwritten.
BitBlt(hdcSave, 0, 0, ptSize.x, ptSize.y, hdcTemp, 0, 0, SRCCOPY);
// Set the background color of the source DC to the color.
// contained in the parts of the bitmap that should be transparent
cColor = SetBkColor(hdcTemp, cTransparentColor);
// Create the object mask for the bitmap by performing a BitBlt
// from the source bitmap to a monochrome bitmap.
BitBlt(hdcObject, 0, 0, ptSize.x, ptSize.y, hdcTemp, 0, 0,
SRCCOPY);
// Set the background color of the source DC back to the original
// color.
SetBkColor(hdcTemp, cColor);
// Create the inverse of the object mask.
BitBlt(hdcBack, 0, 0, ptSize.x, ptSize.y, hdcObject, 0, 0,
NOTSRCCOPY);
// Copy the background of the main DC to the destination.
BitBlt(hdcMem, 0, 0, ptSize.x, ptSize.y, hdc, xStart, yStart,
SRCCOPY);
// Mask out the places where the bitmap will be placed.
BitBlt(hdcMem, 0, 0, ptSize.x, ptSize.y, hdcObject, 0, 0, SRCAND);
// Mask out the transparent colored pixels on the bitmap.
BitBlt(hdcTemp, 0, 0, ptSize.x, ptSize.y, hdcBack, 0, 0, SRCAND);
// XOR the bitmap with the background on the destination DC.
BitBlt(hdcMem, 0, 0, ptSize.x, ptSize.y, hdcTemp, 0, 0, SRCPAINT);
// Copy the destination to the screen.
BitBlt(hdc, xStart, yStart, ptSize.x, ptSize.y, hdcMem, 0, 0,
SRCCOPY);
// Place the original bitmap back into the bitmap sent here.
BitBlt(hdcTemp, 0, 0, ptSize.x, ptSize.y, hdcSave, 0, 0, SRCCOPY);
// Delete the memory bitmaps.
DeleteObject(SelectObject(hdcBack, bmBackOld));
DeleteObject(SelectObject(hdcObject, bmObjectOld));
DeleteObject(SelectObject(hdcMem, bmMemOld));
DeleteObject(SelectObject(hdcSave, bmSaveOld));
// Delete the memory DCs.
DeleteDC(hdcMem);
DeleteDC(hdcBack);
DeleteDC(hdcObject);
DeleteDC(hdcSave);
DeleteDC(hdcTemp);
}
-----------------------------------------------------------------------
I use function a lot and it works perfect. Recently , by chance i finded out
there's a problem in win98 ( second edition ) when using 16 BIT COLOR.
Here's example of how i use this function :
DrawTransparentBitmap(
m_hMemDC ,
HBITMAP(pictBubble),
nBubblePosX,
nBubblePosY,
CLR_TRANSPARENT);
Here's my define of transparent color ( "clean" CYAN )
#define CLR_TRANSPARENT RGB(0,255,255)
As i said , it works everywhere except win98 ( second edition ) when using 16 BIT COLOR.
As far as i know , each loaded image produces it's own palette. In some cases , it can
cause color to be changed to nearest color and obviously , transparency won't work in this
case since above function needs transparent color to be exact down to pixel.
So , i tried to use following to work it out :
cTransparentColor = GetNearestColor( hdc , CLR_TRANSPARENT );
But , it didn't work.
Need your help ( it's pretty urgent ) , thanks !
P.S. I just prefer solution that won't force me to change everything , but a small patch 
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All right I'll give you this one function, since it is in my list for posseble aticles to this site. (it is only a part of of the file - the MSDN has an aticle on this suject some where, not to mention the wwww)
////////////////////////////////
// John R. Shaw (2001/03/23)
// Transparent Blit for Windows 3.x and above
//////////////////////////////////////////////////////////
BOOL TransBitBlt(
HDC hdcDest, // handle to destination DC
int nXOriginDest, // x-coord of destination upper-left corner
int nYOriginDest, // y-coord of destination upper-left corner
int nWidthDest, // width of destination rectangle
int hHeightDest, // height of destination rectangle
HDC hdcSrc, // handle to source DC
int nXOriginSrc, // x-coord of source upper-left corner
int nYOriginSrc, // y-coord of source upper-left corner
int nWidthSrc, // width of source rectangle
int nHeightSrc, // height of source rectangle
UINT crTransparent // color to make transparent
)
{
// Win 98 and above
if( g_TransBlt.DrawTransparent(
hdcDest, nXOriginDest, nYOriginDest, nWidthDest, hHeightDest,
hdcSrc , nXOriginSrc , nYOriginSrc , nWidthSrc , nHeightSrc, crTransparent) )
{
return TRUE;
}
// Win 3.x and above
// Note: This technique may not necessarily work on printer devices.
// Create temporary DCs
HDC hdcTemp = CreateCompatibleDC(hdcDest);
if( hdcTemp == NULL )
return FALSE;
HDC hdcMask = CreateCompatibleDC(hdcDest);
if( hdcTemp == NULL )
{
DeleteDC(hdcTemp);
return FALSE;
}
// Create temporary Bitmaps
HBITMAP hBmpMask = CreateBitmap(nWidthSrc,nHeightSrc,1,1,NULL);
if( hBmpMask == NULL )
{
DeleteDC(hdcMask);
DeleteDC(hdcTemp);
return FALSE;
}
HBITMAP hBmpTemp = CreateCompatibleBitmap(hdcDest,nWidthSrc,nHeightSrc);
if( hBmpTemp == NULL )
{
DeleteObject(hBmpTemp);
DeleteDC(hdcMask);
DeleteDC(hdcTemp);
return FALSE;
}
HGDIOBJ hOldBmpMask = SelectObject(hdcMask,HGDIOBJ(hBmpMask));
// Use temporary DC to reduce flicker
HGDIOBJ hOldBmpTemp = SelectObject(hdcTemp,HGDIOBJ(hBmpTemp));
if( BitBlt(hdcTemp,0, 0, nWidthSrc,nHeightSrc, hdcDest, nXOriginDest, nYOriginDest, SRCCOPY) )
{
// If we made it here there should be no more possible problems
// Create mask using crTransparent
COLORREF OldBkColor = SetBkColor(hdcSrc,crTransparent);
BitBlt(hdcMask,0, 0, nWidthSrc,nHeightSrc,hdcSrc, nXOriginSrc,nYOriginSrc, SRCCOPY);
SetBkColor(hdcTemp,OldBkColor);
// Draw bitmap using mask
BitBlt(hdcTemp,0, 0, nWidthSrc,nHeightSrc,hdcSrc, nXOriginSrc,nYOriginSrc, SRCINVERT);
BitBlt(hdcTemp,0, 0, nWidthSrc,nHeightSrc,hdcMask, 0, 0, SRCAND);
BitBlt(hdcTemp,0, 0, nWidthSrc,nHeightSrc,hdcSrc, nXOriginSrc,nYOriginSrc, SRCINVERT);
// Copy Temporary DC to Destination DC
BitBlt(hdcDest,nXOriginDest, nYOriginDest, nWidthDest,hHeightDest,hdcTemp, 0, 0, SRCCOPY);
}
// Clean up
SelectObject(hdcMask,hOldBmpMask);
SelectObject(hdcTemp,hOldBmpTemp);
DeleteDC(hdcMask);
DeleteDC(hdcTemp);
DeleteObject(hBmpMask);
DeleteObject(hBmpTemp);
return TRUE;
}
Trust in the code Luke. Yea right!
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John,
Thanks , but your answer isn't answering my question. I do know how works
TransparentBlt function , i asked what's wrong in my function for drawing transparent BITMAPS.
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IncrediBuild[^] is a development tool that substantially boosts C/C++ compilation speed, reducing a project's build time by up to 90%.
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Hi Friends
I need to shutdown a PC By Code ?
I know ExitWindowsEx but can't understand all the Parameters
The Code Should be able to turn off the PC On All Windows OS.
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BOOL ExitWindowsEx(<br />
UINT uFlags,
DWORD dwReserved
);
set uFlags to EWX_POWEROFF to turn off !!
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I have to get the Bitmap of a HTML page,without displaying it .
The class used to load HTML is CDhtmlDialog .This is the sample code
CDhtmlDialog key;
Key.Navigate(fileName,0,NULL,NULL,NULL,0);
Key.SetWindowPos(this,rect1.left,rect1.top,rect1.Width(),rect1.Height(),SWP_SHOWWINDOW);//OK working
CDC * pDc=Key.GetDC();
HDC htmlDC=pDc->GetSafeHdc();
//create a sample image
CImage dest;
if(dest.CreateEx(118,88,24,BI_RGB,NULL,0)==FALSE)
{
AfxMessageBox("Error in extracting the Keyframe");
return FALSE;
}
HDC destDC=dest.GetDC();
SetStretchBltMode(destDC,HALFTONE);
//copy the
if(StretchBlt(destDC,0,0,118,88,htmlDC,0,0,rect1.Width(),rect1.Height(),SRCCOPY)==FALSE)
{
AfxMessageBox("Unable to Extract Key Frame");
return FALSE;
}
Now the problem with this is that the BItMap is not of the HTML page but of the application Mainframe window !!!!!!
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Hey Friends Can someone suggest a way to get the active
FrameWindow From the Document Class in case of an MDI .
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http://www.codeguru.com/FAQS/FAQ-A01.html
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I want to generate an alarm on the pressing of a certain button in my MFC application. I am totally blank in it. Plz suggest me relevent apis/codes e.t.c to do the particular task.
Reply me soon
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Hi, I tried to change the default document icon in my application but it doesn't reflect in the saved file. Does anybody help me how to do it?
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Did you change both the 16x16 and 32x32 versions of the document icon? Depending on how you have windows explorer setup, only one of these is actually displayed.
Dave
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I have downloaded smtp wrapper classes(infact an MGF project). The code compiles but when I send the mail an error message box appears. I am providing the right SMTP server address(IP) but connection to the server fails.
Thats where the error lies.
if( !m_wsSMTPServer.Connect( GetServerHostName(), GetPort() ) )
{
m_sError = _T( "Unable to connect to the server" );
m_wsSMTPServer.Close();
return FALSE;
}
Please suggest me what to do as I am a beginner and can't figure the errors out easily. So kindly guide me step by step or if you have any codes in working order Plz send me as I am running out of time.
__________________
Reply me soon
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HI,
I'm sure this problem has been reach at least by one developper : in a property sheet, property pages are not initialized (the window handle is invalid) while the user don't activate it.
What is the right manner to initialize all property pages ? Cause I must read the content of all of them in order to produce a XML output and I don't want to produce an update of the modified data.
Thanks !!
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During the OnInitDialog (or equivalent) of the propertysheet, you need to iterate through all the pages and make each one active in turn, I think SetActivePage() is what you want. You may have to add in a small message pumped delay between each SetActivePage() call so that he page can create itself properly.
Roger Allen
Sonork 100.10016
Were you different as a kid? Did you ever say "Ooohhh, shiny red" even once? - Paul Watson 11-February-2003
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Thanks Roger,
The same idea comes to me but I wasn't sure that it was such a good idea because I think this method will produce flickering during initialization, isn't it ?
For my current project, it'es not a problem because I use multiple SDI views and the view containing property sheet isn't showed by default 
Thank you agin !
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During the constructor, modify the m_psp struct of the newly added property page in this way:
this->m_YourPropertyPageDlg.m_psp.dwFlags |= PSP_PREMATURE;
hope this helps.
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Yeah too cool !! Exactly what I was looking for !! Thank you very much Joan !
Sincerly.
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