C++ 文件復制
阿新 • • 發佈:2017-05-07
pac count() 不足 內容 lose 讀取 文件 same 數組
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 return0; 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字節,放入buf數組中,同時文件指針向後移動2048字節 37 //若不足2048字節遇到文件結尾,則以實際提取字節讀取。 38 in.read(buf, 2048); 39 //gcount()用來提取讀取的字節數,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++ 文件復制