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From: lbrtchx AT hotmail DOT com (CPPNewbie)
Newsgroups: comp.os.msdos.djgpp
Subject: no matching function for call
Organization: Acecape, Inc.
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Date: 17 Dec 2001 22:57:41 GMT
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Reply-To: djgpp AT delorie DOT com


  Hi,

  I was testing code that I was able to run using VC++6 without a hitch, but djgpp is giving me the compile time error:

 no matching function for call to 
`std::basic_ofstream<char, std::char_traits<char> >::write(unsigned char*&, unsigned int)'
c:/djgpp/lang/cxx-v3/bits/ostream.tcc:

 because I try to read data from and write to files using 

ofstream's  .write((unsigned char*) &ut, sizeof(unsigned char))

 and 

 unsigned char* ucAr = new unsigned char[ASCIIVOL]; 
 ifBinStrm.read((unsigned char*) ucAr, ASCIIVOL); 

 Is there a way to make the compiler/linker swallow these kinds of C-like code and keep going?

 My question would be then. How do you read/write a number of raw bytes from/to a file?

 Thanks

// - - - - - - CODE EXAMPLE - - - - - - - -

#include <fstream.h> 

// __ Constant  
const unsigned int ASCIIVOL = 256; 

int main(void){
 unsigned int ut, utStrt = 0, utTp = ASCIIVOL; 

// __ writing byte size binary data 
 ofstream ofBinStrm; 
 ofBinStrm.open("TmpFl.bin.", ios::out|ios::binary); 
 for(ut = 0; (ut < utTp); ++ut){ ofBinStrm.write((unsigned char*) &ut, sizeof(unsigned char)); } 
 cerr << " ofBinStrm.tellp()=" << ofBinStrm.tellp() << endl; 
 ofBinStrm.close(); 

// __ Opening file as ifstream 
 ifstream ifBinStrm; 
 ifBinStrm.open("TmpFl.bin.", ios::in|ios::binary); 

// __ Dumping file at once on the array 
 unsigned char* ucAr = new unsigned char[ASCIIVOL]; 
 ifBinStrm.read((unsigned char*) ucAr, ASCIIVOL); 
 cerr << " ifBinStrm.tellg()=" << ifBinStrm.tellg() << endl; 
 ifBinStrm.close(); 

// __ printing array 
 for(ut = 0; (ut < utTp); ++ut){
  cerr << ut << "," << (unsigned int)ucAr[ut] <<", ucAr[" << ut << "]=" << ucAr[ut] << endl;
 }
 delete[] ucAr;
// __ 
 return(0);
}//  main