DirectX / C++ problem

[pauiel]

I'm new to both languages(C++ and DirectX), and I was putting the code from the book I got into my compiler. (Not the book actually, but it was from the CD that came with the book, so the code is accurate). The compiler puts up these warnings/errors:
In member function 'BOOL
Warning/passing NULL used for non-pointer argument 1 of virtual
Linker Error/undefined reference to DirectDrawCreate@12
Build Error/Project1.exe Error 1

Here's the codeif you scroll to the bottom and go up, you'll find where I marked the error)

//bmp.cpp: member functions for the bmp file reader

//Copyright Ian Parberry, 1999
//Last updated May 22, 2000

#include "bmp.h" //header file

//constructors and destructors

CBmpFileReader::CBmpFileReader(){ //constructor
m_cImage=0; //memory not yet allocated
}

CBmpFileReader::~CBmpFileReader(){ //destructor
delete[]m_cImage; //reclaim memory from image data
}

//member functions

BOOL CBmpFileReader::load(char *filename){ //load bmp from this file
HANDLE hfile; //input file handle
DWORD actualRead; //number of bytes actually read
int image_size; //size of image (width*height)
BOOL OK=TRUE; //no error has occurred yet
//open input file for reading
hfile=CreateFile(filename,GENERIC_READ,FILE_SHARE_READ,
(LPSECURITY_ATTRIBUTES)NULL,OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,(HANDLE)NULL);
//bail if file could not be opened
if(hfile==INVALID_HANDLE_VALUE)return FALSE;
//read the header and info structures
OK=ReadFile(hfile,&m_BMPFileHead,sizeof(m_BMPFileHead),
&actualRead,NULL);
if(OK)OK=ReadFile(hfile,&m_BMPFileInfo,
sizeof(m_BMPFileInfo),&actualRead,NULL);
//make sure the bmp is 8-bit color
if(OK)OK=m_BMPFileInfo.biBitCount==COLOR_DEPTH;
//get the bmp palette
if(OK)OK=ReadFile(hfile,m_rgbPalette,sizeof(m_rgbPalette),
&actualRead,NULL);
//bail out is something went wrong
if(!OK){CloseHandle(hfile); return FALSE;}
//allocate memory for image data
image_size=m_BMPFileInfo.biWidth*m_BMPFileInfo.biHeight;
if(m_cImage)delete[]m_cImage; //dispose of any old space
m_cImage=new BYTE[image_size]; //allocate new space
if(!m_cImage){ //bail if alloc failed
CloseHandle(hfile); return FALSE;
}
//round up line width to next multiple of 4
int width=(m_BMPFileInfo.biWidth+3)&~3;
//read bmp image
int i=0; //counter
BYTE trash[4]; //to hold the trash at the end of each line
int remainder=width-m_BMPFileInfo.biWidth; //width of trash
while(OK&&i<m_BMPFileInfo.biHeight){
//read data
OK=OK&&ReadFile(hfile,
(BYTE*)(m_cImage+i*m_BMPFileInfo.biWidth),
m_BMPFileInfo.biWidth,&actualRead,NULL);
//read trash at end of line
OK=OK&&ReadFile(hfile,trash,remainder,&actualRead,NULL);
i++; //next line
}
if(!OK)delete[]m_cImage; //clean up if failed
//close up and exit
CloseHandle(hfile);
return OK;
} //load

BOOL CBmpFileReader::draw(LPDIRECTDRAWSURFACE surface){
DDSURFACEDESC ddsd; //direct draw surface descriptor
BYTE *dest,*src; //destination and source pointers
int src_width; //width of source
//init surface descriptor
memset(&ddsd,0,sizeof(DDSURFACEDESC));
ddsd.dwSize=sizeof(ddsd);
//lock down surface
if(FAILED(surface->Lock(NULL,&ddsd,DDLOCK_WAIT,NULL)))
return FALSE;
//calculate addresses and width
dest=(BYTE*)ddsd.lpSurface; //destination
src=m_cImage+
((m_BMPFileInfo.biHeight-1)*m_BMPFileInfo.biWidth);
//trim bmp if too wide
if(m_BMPFileInfo.biWidth>ddsd.lPitch)src_width=ddsd.lPitch;
else src_width=m_BMPFileInfo.biWidth;
//move data to surface
for(int i=0; i<m_BMPFileInfo.biHeight; i++){
memcpy(dest,src,src_width);
dest+=ddsd.lPitch; src-=src_width;
}
//clean up and return
surface->Unlock(NULL);
return TRUE;
} //draw

BOOL CBmpFileReader::setpalette(LPDIRECTDRAWPALETTE palette){
PALETTEENTRY pe[COLORS]; //intermediate palette
//construct pe[]
for(int i=0; i<COLORS; i++){ //for each palette entry
pe.peRed=m_rgbPalette.rgbRed; //set red
pe.peGreen=m_rgbPalette.rgbGreen; //set green
pe.peBlue=m_rgbPalette.rgbBlue; //set blue
}
//load direct draw palette to surface
palette->SetEntries(NULL,0,COLORS,pe);//THE ERROR IS HERE
return TRUE;
}

 

[BlackDice]

I'm not sure if this will actually be helpful, but one thing I've found is that those DirectX books usually neglect to mention that you need to add the library files in your project settings (like D3D8.lib) and I've even seen them forget to add the header files in their .cpp files, so make sure you check that out also.

bdiamond

 

[Skute]

You need todo:

#pragma comment(lib, "D3D8.lib")

or whatever the name of the library is that you need. Put those at the top of the file.

Try the DX forum on here:

http://www.tek-tips.com/threadminder.cfm?spid=761

Skute

&quot;There are 10 types of people in this World, those that understand binary, and those that don't!&quot;