c++ 获取文件图标，类型名称，属性 SHGetFileInfo

SHGetFileInfo是一个相当实用的Windows API函数。

// 【MoreWindows工作笔记4】 获取文件图标，类型名称，属性 SHGetFileInfo
#include <Windows.h>
#include <iostream>
using namespace std;
int main()
{
  printf("   【MoreWindows工作笔记4】 获取文件图标，类型名称，属性 SHGetFileInfo\n");
  printf(" - http://blog.csdn.net/morewindows/article/details/16358681 -\n");
  printf(" -- By MoreWindows( http://blog.csdn.net/MoreWindows ) --\n\n");  

  CoInitialize(NULL);
  char file_name[] = "C:\\MoreWindows.mp3";
  SHFILEINFO sfi = {};

  cout<<"file name = "<<file_name<<endl;

  // type name
  SHGetFileInfo(file_name, , &sfi, sizeof(sfi), SHGFI_USEFILEATTRIBUTES | SHGFI_TYPENAME);
  cout<<"type name = "<<sfi.szTypeName<<endl;

  // display name
  SHGetFileInfo(file_name, , &sfi, sizeof(sfi), SHGFI_USEFILEATTRIBUTES | SHGFI_DISPLAYNAME);
  cout<<"display name = "<<sfi.szDisplayName<<endl;

  // attribute
  SHGetFileInfo(file_name, , &sfi, sizeof(sfi), SHGFI_USEFILEATTRIBUTES | SHGFI_ATTRIBUTES);
  cout<<"attribute = "<<hex<<sfi.dwAttributes<<endl;  // 使用IShellFolder::GetAttributesOf函数解析

  // HICON
  // 除了SHGFI_ICON之外还有SHGFI_LARGEICON(大图标), SHGFI_SMALLICON(小图标)
  SHGetFileInfo(file_name, , &sfi, sizeof(sfi), SHGFI_USEFILEATTRIBUTES | SHGFI_ICON);
  cout<<"HICON = 0x"<<hex<<sfi.hIcon<<endl;  // 使用IShellFolder::GetAttributesOf函数解析
  DestroyIcon(sfi.hIcon);

  // HICON system index
  SHGetFileInfo(file_name, , &sfi, sizeof(sfi), SHGFI_USEFILEATTRIBUTES | SHGFI_SYSICONINDEX);
  cout<<"HICON system index = "<<sfi.iIcon<<endl;  // 使用IShellFolder::GetAttributesOf函数解析

  CoUninitialize();

  // SHGFI_USEFILEATTRIBUTES 的说明
  // Indicates that the function should not attempt to access the file specified by pszPath.
  // Rather, it should act as if the file specified by pszPath exists with the file attributes passed in dwFileAttributes.
  // This flag cannot be combined with the SHGFI_ATTRIBUTES, SHGFI_EXETYPE, or SHGFI_PIDL flags.
  return ;
}