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以下代码是我的应用程序的一部分。我想使用编辑框从文件保存对话框中获取一个值。所以我使用 AddEditBox 函数和 GetEditBoxText 返回值。我在编辑框中输入“2000.0”,但 rturn 值为空。有什么问题吗?
wstring GetSaveFileForMakeDif(double & MinDistance) {
const DWORD CONTROL_GROUP = 5001;
const DWORD CONTROL_LABEL = 5002;
const DWORD CONTROL_EDITBOX_MINDIST = 5003;
wstring ret(L"");
HRESULT hr = S_FALSE;
IFileDialogCustomize *pfdc = NULL;
// Create a new common open file dialog.
IFileSaveDialog *pfd = NULL;
hr = CoCreateInstance(CLSID_FileSaveDialog, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pfd));
if (SUCCEEDED(hr))
{
DWORD dwOptions;
hr = pfd->GetOptions(&dwOptions);
// Set the title of the dialog.
if (SUCCEEDED(hr)) {
hr = pfd->SetTitle(L"Select Files");
hr = pfd->SetFileName(L"outputfile");
hr = pfd->SetDefaultExtension(L"txt");
}
// Set up the customization.
hr = pfd->QueryInterface(IID_PPV_ARGS(&pfdc));
if (SUCCEEDED(hr))
{
hr = pfdc->StartVisualGroup(CONTROL_GROUP, L"");
if (SUCCEEDED(hr))
hr = pfdc->AddText(CONTROL_LABEL, L"Min Distance:");
if (SUCCEEDED(hr))
hr = pfdc->AddEditBox(CONTROL_EDITBOX_MINDIST, L"2000.0");
pfdc->EndVisualGroup();
}
// Show the open file dialog.
if (SUCCEEDED(hr))
{
hr = pfd->Show(hMainWindow);
if (SUCCEEDED(hr))
{
IShellItem *psi = NULL;
hr = pfd->GetResult(&psi);
wchar_t *pszPath = new wchar_t[MAX_PATH];
psi->GetDisplayName(SIGDN_FILESYSPATH, &pszPath);
if (SUCCEEDED(hr))
{
ret = pszPath;
wchar_t * txt = NULL;
hr = pfdc->GetEditBoxText(CONTROL_EDITBOX_MINDIST, &txt);
//txt return L""
MinDistance = _wtof(txt);
}
}
}
pfd->Release();
}
pfdc->Release();
return ret;
};
最佳答案
需要事件处理来在对话框关闭之前捕获值。
这里有一个完整的 MSDN 示例: Common File Dialog Sample
目前下载链接似乎不可用。下面的示例显示了如何在 OnFileOk
请注意,您需要 CoTaskMemFree
来释放由 GetEditBoxText
分配的内存
#include <windows.h>
#include <shobjidl.h>
#include <shlwapi.h>
#include <new>
#pragma comment(linker, "\"/manifestdependency:type='Win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' processorArchitecture='*' publicKeyToken='6595b64144ccf1df' language='*'\"")
#pragma comment(lib, "Shlwapi.lib")
// Controls
#define CONTROL_GROUP 2000
#define CONTROL_LABEL 5002
#define CONTROL_EDITBOX_MINDIST 5003
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 *pfd);
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 *) { return S_OK; };
IFACEMETHODIMP OnOverwrite(IFileDialog *, IShellItem *, FDE_OVERWRITE_RESPONSE *) { return S_OK; };
// IFileDialogControlEvents methods
IFACEMETHODIMP OnItemSelected(IFileDialogCustomize *, DWORD, DWORD) { return S_OK; };
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;
};
// Instance creation helper
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;
}
//EDIT BEGIN ***************************
// IFileDialogEvents methods
IFACEMETHODIMP CDialogEventHandler::OnFileOk(IFileDialog *fileDialog)
{
IFileDialogCustomize *fileCustomize = NULL;
fileDialog->QueryInterface(IID_PPV_ARGS(&fileCustomize));
wchar_t *buf;
fileCustomize->GetEditBoxText(IDC_EDTI1, &buf);
MessageBox(0, buf, 0, 0);
CoTaskMemFree(buf);
fileCustomize->Release();
return S_OK;
}
//EDIT END *****************************
// This code snippet demonstrates how to add custom controls in the Common File Dialog.
HRESULT AddCustomControls()
{
// 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))
{
// Create an event handling object, and hook it up to the dialog.
IFileDialogEvents *pfde = NULL;
DWORD dwCookie = 0;
hr = CDialogEventHandler_CreateInstance(IID_PPV_ARGS(&pfde));
if (SUCCEEDED(hr))
{
// Hook up the event handler.
hr = pfd->Advise(pfde, &dwCookie);
if (SUCCEEDED(hr))
{
// Set up a Customization.
IFileDialogCustomize *pfdc = NULL;
if (SUCCEEDED(pfd->QueryInterface(IID_PPV_ARGS(&pfdc))))
{
pfdc->StartVisualGroup(CONTROL_GROUP, L"");
pfdc->AddText(CONTROL_LABEL, L"Min Distance:");
pfdc->AddEditBox(CONTROL_EDITBOX_MINDIST, L"2000.0");
pfdc->EndVisualGroup();
pfdc->Release();
}
else
{
// Unadvise here in case we encounter failures before we get a chance to show the dialog.
pfd->Unadvise(dwCookie);
}
}
pfde->Release();
}
if (SUCCEEDED(hr))
{
// Now show the dialog.
hr = pfd->Show(NULL);
if (SUCCEEDED(hr))
{
// You can add your own code here to handle the results.
}
// Unhook the event handler.
pfd->Unadvise(dwCookie);
}
pfd->Release();
}
return hr;
}
int APIENTRY wWinMain(HINSTANCE, HINSTANCE, PWSTR, int)
{
CoInitializeEx(NULL, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE);
AddCustomControls();
CoUninitialize();
return 0;
}
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