C++ 檔案複製

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 1 #include<iostream> 2 #include<fstream> 3  4 void copy(char* src, char* dst); 5 int main() 6 { 7     using namespace std; 8     char src[50] = "E:/test/jdk-8u121-windows-x64.exe"; 9     char dst[50] = "E:\\test\\jdk-8u121-windows-x64_bak.exe";10     copy(src, dst);11     12     return 0;13 }14 15 void copy(char* src, char* dst)16 {17     using namespace std;18     ifstream in(src,ios::binary);19     ofstream out(dst,ios::binary);20     if (!in.is_open()) {21         cout << "error open file " << src << endl;22         exit(EXIT_FAILURE);23     }24     if (!out.is_open()) {25         cout << "error open file " << dst << endl;26         exit(EXIT_FAILURE);27     }28     if (src == dst) {29         cout << "the src file can‘t be same with dst file" << endl;30         exit(EXIT_FAILURE);31     }32     char buf[2048];33     long long totalBytes = 0;34     while(in)35     {36         //read從in流中讀取2048位元組，放入buf數組中，同時檔案指標向後移動2048位元組37         //若不足2048位元組遇到檔案結尾，則以實際提取位元組讀取。38         in.read(buf, 2048);    39         //gcount()用來提取讀取的位元組數，write將buf中的內容寫入out流。40         out.write(buf, in.gcount());    41         totalBytes += in.gcount();42     }43     in.close();44     out.close();45 }

 

C++ 檔案複製