Solved

linking gdi

Posted on 2007-12-04
6
403 Views
Last Modified: 2012-06-21
this pops

C:\DOCUME~1\ADMINI~1\LOCALS~1\Temp/ccaAbaaa.o:hdc.cpp:(.text+0x39a): undefined reference to `CreateDIBSection@24'
collect2: ld returned 1 exit status



when I try to compile this, and it's been suggested that the way to solving it is to

"You need to link with gdi32.lib - I thin, with MinGW, that is libgdi32.a"



how do I do that?








#include <sstream>
#include <windows.h>
#include <iostream>
#include <vector>
#include <string.h>
#include <stdio.h>

using namespace std;


// save window and hdc hdc return are the same color?
// do they have the same picture?
// ie, what

void SaveWindow(HWND hwnd, const char* pName);
void savewindow ( HWND hwnd1, string string1 );
// save the window given hwnd


int main ()
{
     
     
     
     
     
      return 0;
}



void savewindow ( HWND hwnd1, string string1 )
{
      stringstream ss;
      ss << string1 << ".bmp";
      SaveWindow( hwnd1, ss.str().c_str());
}
     
     
void SaveWindow(HWND hwnd, const char* pName)
{
        BYTE* pDrawingSurfaceBits;
        RECT rc;
        HDC hDC = GetDC(hwnd);
        BITMAPINFOHEADER BMIH;

        GetWindowRect(hwnd,&rc);

        BMIH.biSize = sizeof(BITMAPINFOHEADER);
        BMIH.biBitCount = 24;
        BMIH.biPlanes = 1;
        BMIH.biCompression = BI_RGB;
        BMIH.biWidth = rc.right - rc.left;
        BMIH.biHeight = rc.bottom - rc.top;
        BMIH.biSizeImage = ((((BMIH.biWidth * BMIH.biBitCount)
                           + 31) & ~31) >> 3) * BMIH.biHeight;
        HBITMAP hDrawingSurface = CreateDIBSection(hDC,
                 (CONST BITMAPINFO*)&BMIH, DIB_RGB_COLORS,
                 (void**)&pDrawingSurfaceBits, NULL, 0);
        ReleaseDC(hwnd,hDC);

       
        //Create a new file for writing
        FILE *pFile = fopen(pName, "wb");
        if(pFile == NULL)
        {
            MessageBox(NULL,"Cannot open file","Error",MB_OK);
            return;
        }
        BITMAPFILEHEADER bmfh;
        int nBitsOffset = sizeof(BITMAPFILEHEADER) + BMIH.biSize;
        LONG lImageSize = BMIH.biSizeImage;
        LONG lFileSize = nBitsOffset + lImageSize;
        bmfh.bfType = 'B'+('M'<<8);
        bmfh.bfOffBits = nBitsOffset;
        bmfh.bfSize = lFileSize;
        bmfh.bfReserved1 = bmfh.bfReserved2 = 0;
        //Write the bitmap file header
        UINT nWrittenFileHeaderSize = fwrite(&bmfh, 1,
                     sizeof(BITMAPFILEHEADER), pFile);
        //And then the bitmap info header
        UINT nWrittenInfoHeaderSize = fwrite(&BMIH,
               1, sizeof(BITMAPINFOHEADER), pFile);
        //Finally, write the image data itself
        //-- the data represents our drawing
        UINT nWrittenDIBDataSize =
             fwrite(pDrawingSurfaceBits, 1, lImageSize, pFile);

        fclose(pFile);
}
0
Comment
Question by:Troudeloup
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 3
6 Comments
 
LVL 86

Expert Comment

by:jkr
ID: 20408710
As I wrote in your other Q, under MinGW, that probably is name libgdi32.a, or

g++ mycode.cpp -lgdi32
0
 
LVL 86

Accepted Solution

by:
jkr earned 500 total points
ID: 20408718
BTW, the '-lgdi32' is not a typo, it follows the GCC naming conventions: libs are created as 'libmycode.a' and referred to as '-lmycode' when building.
0
 

Author Comment

by:Troudeloup
ID: 20408719
so for this specific compile, I need to add -lgdi32    ?
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 86

Expert Comment

by:jkr
ID: 20408723
Yup, give that a try...
0
 

Author Comment

by:Troudeloup
ID: 20408752
yes it works :)
0
 

Author Comment

by:Troudeloup
ID: 20408755
however, it's black alright.
0

Featured Post

Secure Your Active Directory - April 20, 2017

Active Directory plays a critical role in your company’s IT infrastructure and keeping it secure in today’s hacker-infested world is a must.
Microsoft published 300+ pages of guidance, but who has the time, money, and resources to implement? Register now to find an easier way.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Templates For Beginners Or How To Encourage The Compiler To Work For You Introduction This tutorial is targeted at the reader who is, perhaps, familiar with the basics of C++ but would prefer a little slower introduction to the more ad…
This article will show you some of the more useful Standard Template Library (STL) algorithms through the use of working examples.  You will learn about how these algorithms fit into the STL architecture, how they work with STL containers, and why t…
The goal of the video will be to teach the user the concept of local variables and scope. An example of a locally defined variable will be given as well as an explanation of what scope is in C++. The local variable and concept of scope will be relat…
The viewer will be introduced to the member functions push_back and pop_back of the vector class. The video will teach the difference between the two as well as how to use each one along with its functionality.

730 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question