C/C++轻松实现文件下载

首先，我们先来了解几个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是路径

maxlen：是长度

功能是得到当前程序的路径

下一个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   
);

下面是代码：

#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;  
}

程序运行截图：

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