Question

我的自动更新程序出现问题

它应该下载＆amp;保存来自网站的更新，但问题是（而且我确定这种情况很多但我无法说出能让我得到谷歌答案的关键字）它会保存它收到的.exe数据而不是因为它应该至。它保存了acsi中的字节...让我说明一下：

Offset      0  1  2  3  4  5  6  7   8  9  A  B  C  D  E  F

00000000   4D 5A 90 00 03 00 00 00  04 00 00 00 FF FF 00 00   MZ          ÿÿ  
00000010   B8 00 00 00 00 00 00 00  40 00 00 00 00 00 00 00   ¸       @       
00000020   00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00                   
00000030   00 00 00 00 00 00 00 00  00 00 00 00 B0 00 00 00               °

这个数据（这是正确的数据）在新程序中看起来像这样：

Offset      0  1  2  3  4  5  6  7   8  9  A  B  C  D  E  F

00000000   0D 0A 34 44 35 41 39 30  30 30 30 33 30 30 30 30     4D5A9000030000
00000010   30 30 30 34 30 30 30 30  30 30 46 46 46 46 30 30   0004000000FFFF00
00000020   30 30 42 38 30 30 30 30  30 30 30 30 30 30 30 30   00B8000000000000
00000030   30 30 34 30 30 30 30 30  30 30 30 30 30 30 30 30   0040000000000000

正如您所看到的，它将代码字节写为ascii值... 这是我正在使用的代码

接收部分：

char   szRecvBuff[10000] = "" ;
string szRecvHolder = "" ;      
int    iLastCharacter = 0;

    recv(Socket, szRecvBuff, sizeof(szRecvBuff), 0);

    szRecvHolder = szRecvBuff;

    iLastCharacter = szRecvHolder.find_last_of("\n");
    if(iLastCharacter < szRecvHolder.size() && iLastCharacter > 0 ){
    szRecvHolder.erase(iLastCharacter);
    }
  return szRecvHolder;
}
...
...
{
...
...
Recv();
string Edat = Recv();
std::ofstream put("Eprog.exe", ios::hex );
put <<  Edat.c_str();
put.close();

有没有人知道如何去做，我尝试使用谷歌，但我无法说出一个可以给我正确结果的问题

Answer 1

确保以二进制模式打开文件：

std::ofstream put("Eprog.exe", ios::binary | ios::hex );

Answer 2

我在您的代码中看到的更大问题是，当您致电Edat.c_str()时，您可能会向流提供const char*。这个指针没有关于写入流的数量的信息，因此它必须按照惯例停在第一个“\0”。

您应该使用write()调用并使用原始字符缓冲区。

Answer 3

我已经解决了这个问题，而不是试图让编译器将值解释为十六进制我只是简单地创建了一个包含所有256个可能字节的查找表。

unsigned char Table[] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7E, 0x7F, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F, 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF, 0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF, 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF, 0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF, 0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF, 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF };



int GetIndexNumber(string str){
unsigned long rint = NULL;
unsigned long size = str.size() - 2;
unsigned long fi[sizeof(str)];
unsigned long mul;

for( int i = 0; i != 2; i++){
    if( str.at(i+2) == '0' ) fi[i] = 0;
    if( str.at(i+2) == '1' ) fi[i] = 1;
    if( str.at(i+2) == '2' ) fi[i] = 2;
    if( str.at(i+2) == '3' ) fi[i] = 3;
    if( str.at(i+2) == '4' ) fi[i] = 4;
    if( str.at(i+2) == '5' ) fi[i] = 5;
    if( str.at(i+2) == '6' ) fi[i] = 6;
    if( str.at(i+2) == '7' ) fi[i] = 7;
    if( str.at(i+2) == '8' ) fi[i] = 8;
    if( str.at(i+2) == '9' ) fi[i] = 9;
    if( str.at(i+2) == 'A' ) fi[i] = 10;
    if( str.at(i+2) == 'B' ) fi[i] = 11;
    if( str.at(i+2) == 'C' ) fi[i] = 12;
    if( str.at(i+2) == 'D' ) fi[i] = 13;
    if( str.at(i+2) == 'E' ) fi[i] = 14;
    if( str.at(i+2) == 'F' ) fi[i] = 15;
}

for(int i = 0; i != 2 ; i++){
    mul = (1 * pow(16, (double)size-1));
    size--;
    rint += ( mul * fi[i]);
}
return rint;
}

Recv();
string Edat = Recv();
Edat += Recv();
cout<<Edat.c_str()<<endl<<endl;

unsigned char buffer[10000] = "";

for( int i = 0; i <= Edat.size(); i++){
    int PlaceHolder = Edat.find_first_of("0x");
    if(PlaceHolder <= Edat.size() && PlaceHolder > 0){ 
        string tmpstr = Edat.substr(PlaceHolder, 4);
        int TableNumber = GetIndexNumber(tmpstr);
         buffer[i] = Table[TableNumber];
    }
    Edat.replace(PlaceHolder, 4, "");
}

std::ofstream put("Eprog.exe", ios::binary);
put.write((char *)buffer, sizeof(buffer));
put.close(); 

return 0; 
}

C ++自动更新程序

3 个答案: