C++自動更新程序

Question

我有

它應該下載&保存所有來自網站的更新，但問題是（我敢肯定，這種情況很多與我的自動更新程序問題但我不能短語的關鍵字，會讓我在谷歌的答案）它保存所收到的.exe數據不是它應該的。這樣可以節省字節ACSI ...讓我舉例說明：

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    ° 

這個數據，（這是正確的數據）貌似這個新計劃：

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 

正如你所看到的它寫碼 - 字節的ASCII值... 這是我使用

接收部分代碼：

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(); 

有人知道如何去做，我試過使用谷歌，但我不能說一個問題，會給我正確的結果

Answer 1

我看到你的代碼更大的問題是，當你打電話給Edat.c_str()你大概給const char*流。這個指針沒有寫入流的信息，所以它必須按照慣例在第一個'\0'停止。

您應該改用write()調用並使用原始字符緩衝區。

Answer 2

確保你打開你出的文件以二進制方式：

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

Answer 3

我已經解決了這個問題，而不是試圖使編譯器解釋值作爲十六進制我只是做一個查找表包含全部256個可能的字節。

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; 
}