我一直在关注创建Vista / 7打开文件对话框的几个指南/示例，现在由于错误消息声明main.cpp（189）：错误C3861：'CDialogEventHandler_CreateInstance'：标识符，现在已经死了没找到。
我在Google上找不到任何相关信息，只有一页有人重写了示例代码而不使用CDialogEventHandler类。
这是我的代码。 CDialogEventHandler类和函数定义直接来自CommonFileDialogApp的Windows 7 SDK示例：
#include "resource.h"
#include <windows.h> // For common windows data types and function headers
#define STRICT_TYPED_ITEMIDS
#include <objbase.h> // For COM headers
#include <shobjidl.h> // for IFileDialogEvents and IFileDialogControlEvents
#include <shlwapi.h>
#include <knownfolders.h> // for KnownFolder APIs/datatypes/function headers
#include <propvarutil.h> // for PROPVAR-related functions
#include <propkey.h> // for the Property key APIs/datatypes
#include <propidl.h> // for the Property System APIs
#include <strsafe.h> // for StringCchPrintfW
#include <shtypes.h> // for COMDLG_FILTERSPEC
#include <new>
// Controls
#define CONTROL_GROUP 2000
#define CONTROL_RADIOBUTTONLIST 2
#define CONTROL_RADIOBUTTON1 1
#define CONTROL_RADIOBUTTON2 2 // It is OK for this to have the same IDas CONTROL_RADIOBUTTONLIST,
// because it is a child control under CONTROL_RADIOBUTTONLIST
// IDs for the Task Dialog Buttons
#define IDC_BASICFILEOPEN 100
#define IDC_ADDITEMSTOCUSTOMPLACES 101
#define IDC_ADDCUSTOMCONTROLS 102
#define IDC_SETDEFAULTVALUESFORPROPERTIES 103
#define IDC_WRITEPROPERTIESUSINGHANDLERS 104
#define IDC_WRITEPROPERTIESWITHOUTUSINGHANDLERS 105
HWND ghMainWnd = 0;
HINSTANCE ghAppInst = 0;
RECT winRect;
void centerWnd(HWND parent_window);
void openDB();
class CDialogEventHandler : public IFileDialogEvents,
public IFileDialogControlEvents
{
public:
// IUnknown methods
IFACEMETHODIMP QueryInterface(REFIID riid, void** ppv)
{
static const QITAB qit[] = {
QITABENT(CDialogEventHandler, IFileDialogEvents),
QITABENT(CDialogEventHandler, IFileDialogControlEvents),
{ 0 },
};
return QISearch(this, qit, riid, ppv);
}
IFACEMETHODIMP_(ULONG) AddRef()
{
return InterlockedIncrement(&_cRef);
}
IFACEMETHODIMP_(ULONG) Release()
{
long cRef = InterlockedDecrement(&_cRef);
if (!cRef)
delete this;
return cRef;
}
// IFileDialogEvents methods
IFACEMETHODIMP OnFileOk(IFileDialog *) { return S_OK; };
IFACEMETHODIMP OnFolderChange(IFileDialog *) { return S_OK; };
IFACEMETHODIMP OnFolderChanging(IFileDialog *, IShellItem *) { return S_OK; };
IFACEMETHODIMP OnHelp(IFileDialog *) { return S_OK; };
IFACEMETHODIMP OnSelectionChange(IFileDialog *) { return S_OK; };
IFACEMETHODIMP OnShareViolation(IFileDialog *, IShellItem *, FDE_SHAREVIOLATION_RESPONSE *) { return S_OK; };
IFACEMETHODIMP OnTypeChange(IFileDialog *pfd);
IFACEMETHODIMP OnOverwrite(IFileDialog *, IShellItem *, FDE_OVERWRITE_RESPONSE *) { return S_OK; };
// IFileDialogControlEvents methods
IFACEMETHODIMP OnItemSelected(IFileDialogCustomize *pfdc, DWORD dwIDCtl, DWORD dwIDItem);
IFACEMETHODIMP OnButtonClicked(IFileDialogCustomize *, DWORD) { return S_OK; };
IFACEMETHODIMP OnCheckButtonToggled(IFileDialogCustomize *, DWORD, BOOL) { return S_OK; };
IFACEMETHODIMP OnControlActivating(IFileDialogCustomize *, DWORD) { return S_OK; };
CDialogEventHandler() : _cRef(1) { };
private:
~CDialogEventHandler() { };
long _cRef;
};
LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch (msg)
{
case WM_COMMAND:
switch(LOWORD(wParam))
{
case ID_FILE_OPENDB:
openDB();
break;
default:
break;
}
break;
case WM_LBUTTONDOWN:
MessageBox(0, "WM_LBUTTONDOWN message.", "Msg", MB_OK);
return 0;
case WM_KEYDOWN:
if (wParam == VK_ESCAPE)
DestroyWindow(ghMainWnd);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hWnd, msg, wParam, lParam);
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR cmdLine, int showCmd)
{
ghAppInst = hInstance;
HMENU mMenu = LoadMenu(hInstance, MAKEINTRESOURCE(IDR_MENU1));
WNDCLASS wc;
wc.style = CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = ghAppInst;
wc.hIcon = ::LoadIcon(0, IDI_APPLICATION);
wc.hCursor = ::LoadCursor(0, IDC_ARROW);
wc.hbrBackground = (HBRUSH) ::GetStockObject(WHITE_BRUSH);
wc.lpszMenuName = 0;
wc.lpszClassName = "MyWndClassName";
RegisterClass(&wc);
centerWnd(GetDesktopWindow());
ghMainWnd = ::CreateWindow("MyWndClassName", "Space Crusade Database Editor V1.0", WS_OVERLAPPEDWINDOW, winRect.left, winRect.top, 1280, 720, 0, mMenu, ghAppInst, 0);
if(ghMainWnd == 0)
{
::MessageBox(0, "CreateWindow - Failed", 0, 0);
return false;
}
ShowWindow(ghMainWnd, showCmd);
UpdateWindow(ghMainWnd);
MSG msg;
ZeroMemory(&msg, sizeof(MSG));
while (GetMessage(&msg, 0, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return (int)msg.wParam;
}
void centerWnd(HWND parent_window)
{
GetClientRect(parent_window, &winRect);
winRect.left = (winRect.right/2) - (1280/2);
winRect.top = (winRect.bottom/2) - (720/2);
}
void openDB()
{
//Cocreate the file open dialog object
IFileDialog *pfd = NULL;
HRESULT hr = CoCreateInstance(CLSID_FileOpenDialog, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pfd));
if (SUCCEEDED(hr))
{
//Stuff needed for later
const COMDLG_FILTERSPEC rgFExt[] = {{L"SQLite3 Database (*.sqlite)", L"*.sqlite"}};
WCHAR fPath[MAX_PATH] = {};
//Create event handling
IFileDialogEvents *pfde = NULL;
hr = CDialogEventHandler_CreateInstance(IID_PPV_ARGS(&pfde));
if(SUCCEEDED(hr))
{
//Hook the event handler
DWORD dwCookie;
hr = pfd->Advise(pfde, &dwCookie);
if (SUCCEEDED(hr))
{
//Set options for the dialog
DWORD dwFlags;
//Get options first so we do not override
hr = pfd->GetOptions(&dwFlags);
if (SUCCEEDED(hr))
{
//Get shell items only
hr = pfd->SetOptions(dwFlags | FOS_FORCEFILESYSTEM);
if (SUCCEEDED(hr))
{
//Types of files to display (not default)
hr = pfd->SetFileTypes(ARRAYSIZE(rgFExt), rgFExt);
if (SUCCEEDED(hr))
{
//Set default file type to display
hr = pfd->SetDefaultExtension(L"sqlite");
if (SUCCEEDED(hr))
{
//Show dialog
hr = pfd->Show(NULL);
if (SUCCEEDED(hr))
{
//Get the result once the user clicks on open
IShellItem *result;
hr = pfd->GetResult(&result);
if (SUCCEEDED(hr))
{
//Print out the file name
PWSTR fName = NULL;
hr = result->GetDisplayName(SIGDN_FILESYSPATH, &fName);
if (SUCCEEDED(hr))
{
TaskDialog(NULL,NULL,L"File Name",fName,NULL,TDCBF_OK_BUTTON,TD_INFORMATION_ICON,NULL);
CoTaskMemFree(fName);
}
result->Release();
}
}
}
}
}
}
}
pfd->Unadvise(dwCookie);
}
pfde->Release();
}
pfd->Release();
}
HRESULT CDialogEventHandler_CreateInstance(REFIID riid, void **ppv)
{
*ppv = NULL;
CDialogEventHandler *pDialogEventHandler = new (std::nothrow) CDialogEventHandler();
HRESULT hr = pDialogEventHandler ? S_OK : E_OUTOFMEMORY;
if (SUCCEEDED(hr))
{
hr = pDialogEventHandler->QueryInterface(riid, ppv);
pDialogEventHandler->Release();
}
return hr;
}
HRESULT CDialogEventHandler::OnTypeChange(IFileDialog *pfd)
{
IFileSaveDialog *pfsd;
HRESULT hr = pfd->QueryInterface(&pfsd);
if (SUCCEEDED(hr))
{
UINT uIndex;
hr = pfsd->GetFileTypeIndex(&uIndex); // index of current file-type
if (SUCCEEDED(hr))
{
IPropertyDescriptionList *pdl = NULL;
}
pfsd->Release();
}
return hr;
}
// IFileDialogControlEvents
// This method gets called when an dialog control item selection happens (radio-button selection. etc).
// For sample sake, let's react to this event by changing the dialog title.
HRESULT CDialogEventHandler::OnItemSelected(IFileDialogCustomize *pfdc, DWORD dwIDCtl, DWORD dwIDItem)
{
IFileDialog *pfd = NULL;
HRESULT hr = pfdc->QueryInterface(&pfd);
if (SUCCEEDED(hr))
{
if (dwIDCtl == CONTROL_RADIOBUTTONLIST)
{
switch (dwIDItem)
{
case CONTROL_RADIOBUTTON1:
hr = pfd->SetTitle(L"Longhorn Dialog");
break;
case CONTROL_RADIOBUTTON2:
hr = pfd->SetTitle(L"Vista Dialog");
break;
}
}
pfd->Release();
}
return hr;
}
答案 0 :(得分：1)
所以我设法让代码工作。我所做的是从原始帖子中提到的Sample中获取了解决方案文件，并尝试构建并运行它。这是成功的，这使我相信问题出在项目设置中。我尝试切换回Unicode用于排版，但这并没有解决问题。
最后，我刚刚选择了Sample项目，现在我正在改变它的需求。我不确定需要哪些项目选项来使其工作，但我几乎可以肯定它与链接器选项中的某些内容有关。
答案 1 :(得分：0)
对于centerWnd和openDB，你使用了函数原型（我相信它们被称为主函数之前的函数的前向声明），而不是CDialogEventHandler_CreateInstance函数。尝试添加
HRESULT CDialogEventHandler_CreateInstance(REFIID riid, void **ppv);
下
void openDB();
答案 2 :(得分：0)
不确定您是否已获取完整的示例代码，请尝试使用以下库的github示例进行首次编译。
//Libraries I added to get this to work.
#pragma comment(lib,"comctl32.lib")
#pragma comment(lib,"propsys.lib")
#pragma comment(lib,"shlwapi.lib")