未解决的链接器错误许多Windows功能在Qt [英] unresolved linker errors for many windows functions in Qt

问题描述

在Qt，我得到未解决的链接器错误许多Windows函数，如 SHGetKnownFolderPath

  #includepip.h
 #includeui_pip.h
 #include< QFileDialog> 
 #include< QMessageBox> 
 #include< Objbase.h> 
 #include< iostream> 
 #include< fstream> 
 #include< string> 
 #include< sstream> 
 #include< algorithm> 
 #include< QtNetwork / QHostAddress> 
 #include< shlobj.h> 
 #include< windows.h> 
 #include< Shlwapi.h> 
 #include< Knownfolders.h> 
  

功能：

  PWSTR appData = 0; 
 
 if（SUCCEEDED（SHGetKnownFolderPath（FOLDERID_Desktop，
 0，
 NULL，
& appData）））
 {
 wcout< < appData<< endl; 
} 
  

链接器错误：

  pip.obj：error LNK2019：未解析的外部符号_SHGetKnownFolderPath @ 16 
引用函数private：void __thiscall pip :: on_submitButton_clicked（void）
 on_submitButton_clicked @ pip @@ AAEXXZ）
  

我需要告诉QT哪里 Shell32.dll 库是 shlobj.h 吗？

解决方案

您必须使用实现该符号的库（ shell32.lib ）链接 >

您应该在.PRO文件中添加如下内容：

  LIBS + = -LC：\\Path\\Microsoft SDK\\Windows\\v7.1\\Lib-lshell32 
  

In Qt, I am getting unresolved linker errors for many windows functions such as SHGetKnownFolderPath

#include "pip.h"
#include "ui_pip.h"
#include <QFileDialog>
#include <QMessageBox>
#include <Objbase.h>
#include <iostream>
#include <fstream>
#include <string>
#include <sstream>
#include <algorithm>
#include <QtNetwork/QHostAddress>
#include <shlobj.h>
#include <windows.h>
#include <Shlwapi.h>
#include <Knownfolders.h>

Function:

PWSTR appData = 0;

    if (SUCCEEDED(SHGetKnownFolderPath(FOLDERID_Desktop,
                                   0,
                                   NULL,
                                   &appData)))
{
    wcout << appData << endl;
}

Linker Error:

pip.obj : error LNK2019: unresolved external symbol _SHGetKnownFolderPath@16 
referenced in function "private: void __thiscall pip::on_submitButton_clicked(void)" 
(?on_submitButton_clicked@pip@@AAEXXZ)

Do I need to tell QT where the Shell32.dll library is or something for shlobj.h?

解决方案

You have to link your project with the library (shell32.lib) that implements that symbol!

You should add something like the following to the .PRO file:

LIBS += -L"C:\\Path\\Microsoft SDK\\Windows\\v7.1\\Lib" -lshell32

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