C/C++輕鬆實現檔案下載

首先，我們先來瞭解幾個API

_getcwd

Gets the current working directory.

char *_getcwd(      char *buffer,     int maxlen   );

buffer

Storage location for the path.

maxlen

Maximum length of the path in characters: char for _getcwd and wchar_t for _wgetcwd.

易知：buffer是路徑

maxlen：是長度

功能是得到當前程式的路徑

下一個API

URLDownloadToFile function

Downloads bits from the Internet and saves them to a file.

char *_getcwd(      char *buffer,     int maxlen   );  wchar_t *_wgetcwd(      wchar_t *buffer,     int maxlen   );

下面是代碼：

#include <Windows.h>  #include <stdio.h>  #include  <direct.h>    #pragma comment(lib,"URlmon")    int main()  {      char buffer[MAX_PATH];      _getcwd(buffer, MAX_PATH);      strcat_s(buffer, "//1.jpg");      HRESULT Result = URLDownloadToFileA(NULL, "http://112.22.245.11:443/down/de0243d60205717a2a74aea53c0c500c-46353/1.jpg?cts=yd-f-U13274580&    ctp=111A23A228A125&ctt=1484747960&limit=1&spd=1300000&ctk=4ab73a4a76e47ad0b181d0f9fc47b6a1&chk=de0243d60205717a2a74aea53c0c500c-46353", buffer, 0, NULL);      switch (Result)      {      case S_OK:printf("The download started successfully.\n");break;      case E_OUTOFMEMORY: printf("The buffer length is invalid, or there is insufficient memory to complete the operation.\n"); break;      }      return 0;  }

程式運行：

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