implemented wrapping of common 'save' methods

.gitignore

@@ -1,4 +1,6 @@
-*.o
+.gitignore
+
+.o
 *.so
 *.a
 *.test

.vscode/settings.json

@@ -1,9 +0,0 @@
-{
-    "files.associations": {
-        "cstdlib": "c",
-        "memory": "cpp",
-        "semaphore": "cpp",
-        "stop_token": "cpp",
-        "iostream": "cpp"
-    }
-}

ABSTRACT.md

@@ -0,0 +1,17 @@
+# Windows Binary Fuzzing
+
+Modern-day fuzzing is one of the most efficient techniques to automatically detect bugs and vulnerabilities in software projects [1]. It works by automatically feeding pseudo-randomly generated input data to the target program under test. However, most fuzzing techniques are only possible for target programs with source code and without a GUI [2]. This is because closed-source programs and programs with a GUI cannot easily be harnessed by fuzzers. This means, that the fuzzer cannot automatically find a good way to feed input into the program. In the scope of this thesis/project, closed-source GUI programs on Windows should be fuzzed. Contrary to the Linux and open-source community, the Windows ecosystem has received little attention. Therefore, in the scope of this project, a tool should be developed, which automatically harnesses and fuzzes Windows applications. To achieve this, simple binary rewriting frameworks [3] may be used to replace GUI file opening dialoges with an automatic way to feed file input into a program. Then, well-established fuzzing tools [4,5,6] can be used to fuzz multiple Windows-only programs. This should provide a first look into, whether the applications in the Windows ecosystem are as vulnerable as expected.
+
+References:
+
+[1] https://github.com/google/oss-fuzz
+
+[2] https://www.usenix.org/system/files/usenixsecurity24-schilling.pdf
+
+[3] https://ieeexplore.ieee.org/abstract/document/8023154/
+
+[4] https://github.com/googleprojectzero/winafl
+
+[5] https://par.nsf.gov/servlets/purl/10308834
+
+[6] https://www.usenix.org/system/files/sec21-nagy.pdf

README.md

@@ -4,12 +4,17 @@
 
 - [x] `GetOpenFileNameA` (ANSI)
 - [x] `GetOpenFileNameW` (UTF-16)
+- [x] `GetSaveFileNameA` (ANSI)
+- [x] `GetSaveFileNameW` (UTF-16)
 - [x] `IFileOpenDialog`
+- [x] `IFileSaveDialog`
 - [x] `QFileDialog::getOpenFileName`
 - [ ] `QFileDialog::getOpenFileNames`
 - [x] `QFileDialog::getOpenFileUrl`
 - [ ] `QFileDialog::getOpenFileUrls`
 - [ ] `QFileDialog::getOpenFileContent`
+- [x] `QFileDialog::getSaveFileName`
+- [x] `QFileDialog::getSaveFileUrl`
 - [ ] `wxFileDialog`
 
 ## Build scripts

client/src/client.c

@@ -21,8 +21,11 @@ const char *MANGLED_QFileDialog_getOpenFileNames = "?getOpenFileNames@QFileDialo
 const char *MANGLED_QFileDialog_getOpenFileUrl = "?getOpenFileUrl@QFileDialog@@SA?AVQUrl@@PEAVQWidget@@AEBVQString@@AEBV2@1PEAV4@V?$QFlags@W4Option@QFileDialog@@@@AEBV?$QList@VQString@@@@@Z";
 const char *MANGLED_QFileDialog_getOpenFileUrls = "?getOpenFileUrls@QFileDialog@@SA?AV?$QList@VQUrl@@@@PEAVQWidget@@AEBVQString@@AEBVQUrl@@1PEAV4@V?$QFlags@W4Option@QFileDialog@@@@AEBV?$QList@VQString@@@@@Z";
 const char *MANGLED_QFileDialog_getOpenFileContent = "?getOpenFileContent@QFileDialog@@SAXAEBVQString@@AEBV?$function@$$A6AXAEBVQString@@AEBVQByteArray@@@Z@std@@PEAVQWidget@@@Z";
+const char *MANGLED_QFileDialog_getSaveFileName = "?getSaveFileName@QFileDialog@@SA?AVQString@@PEAVQWidget@@AEBV2@11PEAV2@V?$QFlags@W4Option@QFileDialog@@@@@Z";
+const char *MANGLED_QFileDialog_getSaveFileUrl = "?getSaveFileUrl@QFileDialog@@SA?AVQUrl@@PEAVQWidget@@AEBVQString@@AEBV2@1PEAV4@V?$QFlags@W4Option@QFileDialog@@@@AEBV?$QList@VQString@@@@@Z";
 
-char *CUSTOM_FILE = "C:\\Users\\vboxuser\\Downloads\\spoofed_number.txt";
+char *OPEN_FILE = "C:\\Users\\vboxuser\\Downloads\\spoofed_number.txt";
+char *SAVE_FILE = "C:\\Users\\vboxuser\\Downloads\\spoofed_save.txt";
 
 // Function pointers for functions we need to call ourselves
 static void (*fn_QString_const)(void *qstring, const char *str) = NULL;
@@ -46,9 +49,11 @@ static void pre_IFileOpenDialog_GetResult(void *wrapctx, void **user_data);
 static void pre_IFileOpenDialog_Show(void *wrapctx, void **user_data);
 
 static HRESULT custom_IFileDialog_Show(void *, void *);
-static HRESULT custom_IFileDialog_GetResult(void *, IShellItem **ppsitem);
+static HRESULT custom_IFileOpenDialog_GetResult(void *, IShellItem **ppsitem);
+static HRESULT custom_IFileSaveDialog_GetResult(void *, IShellItem **ppsitem);
 
 struct IFileOpenDialogVtbl customFODVtbl = {};
+struct IFileSaveDialogVtbl customFSDVtbl = {};
 
 // --- drwrap Callbacks for WinAPI Functions ---
 
@@ -57,7 +62,7 @@ static void pre_GetOpenFileNameA(void *wrapctx, void **user_data)
     OPENFILENAMEA *ofn = (OPENFILENAMEA *)drwrap_get_arg(wrapctx, 0);
     if (ofn && ofn->lpstrFile)
     {
-        strncpy(ofn->lpstrFile, CUSTOM_FILE, ofn->nMaxFile - 1);
+        strncpy(ofn->lpstrFile, OPEN_FILE, ofn->nMaxFile - 1);
         ofn->lpstrFile[ofn->nMaxFile - 1] = '\0';
     }
 
@@ -69,7 +74,31 @@ static void pre_GetOpenFileNameW(void *wrapctx, void **user_data)
     OPENFILENAMEW *ofn = (OPENFILENAMEW *)drwrap_get_arg(wrapctx, 0);
     if (ofn && ofn->lpstrFile)
     {
-        mbstowcs(ofn->lpstrFile, CUSTOM_FILE, ofn->nMaxFile - 1);
+        mbstowcs(ofn->lpstrFile, OPEN_FILE, ofn->nMaxFile - 1);
+        ofn->lpstrFile[ofn->nMaxFile - 1] = L'\0';
+    }
+
+    drwrap_skip_call(wrapctx, (void *)1, 0);
+}
+
+static void pre_GetSaveFileNameA(void *wrapctx, void **user_data)
+{
+    OPENFILENAMEA *ofn = (OPENFILENAMEA *)drwrap_get_arg(wrapctx, 0);
+    if (ofn && ofn->lpstrFile)
+    {
+        strncpy(ofn->lpstrFile, SAVE_FILE, ofn->nMaxFile - 1);
+        ofn->lpstrFile[ofn->nMaxFile - 1] = '\0';
+    }
+
+    drwrap_skip_call(wrapctx, (void *)1, 0);
+}
+
+static void pre_GetSaveFileNameW(void *wrapctx, void **user_data)
+{
+    OPENFILENAMEW *ofn = (OPENFILENAMEW *)drwrap_get_arg(wrapctx, 0);
+    if (ofn && ofn->lpstrFile)
+    {
+        mbstowcs(ofn->lpstrFile, SAVE_FILE, ofn->nMaxFile - 1);
         ofn->lpstrFile[ofn->nMaxFile - 1] = L'\0';
     }
 
@@ -84,7 +113,7 @@ static void pre_QFileDialog_getOpenFileName(void *wrapctx, void **user_data)
         return;
     // The return value is passed as a pointer in the first argument (sret)
     void *qstring_ret_ptr = (void *)drwrap_get_arg(wrapctx, 0);
-    fn_QString_const(qstring_ret_ptr, CUSTOM_FILE);
+    fn_QString_const(qstring_ret_ptr, OPEN_FILE);
     drwrap_skip_call(wrapctx, NULL, 0);
 }
 
@@ -95,7 +124,46 @@ static void pre_QFileDialog_getOpenFileUrl(void *wrapctx, void **user_data)
 
     const char *prefix = "file:///";
     char urlbuf[MAX_PATH + 10];
-    snprintf(urlbuf, sizeof(urlbuf), "%s%s", prefix, CUSTOM_FILE);
+    snprintf(urlbuf, sizeof(urlbuf), "%s%s", prefix, OPEN_FILE);
+
+    // Replace backslashes for URL format
+    for (char *p = urlbuf; *p; ++p)
+    {
+        if (*p == '\\')
+            *p = '/';
+    }
+
+    // Create a temporary QString for the URL
+    char local_qstring[24]; // Allocate space for a QString object on the stack
+    fn_QString_const(local_qstring, urlbuf);
+
+    // Get the return QUrl object pointer (sret)
+    void *qurl_ret_ptr = (void *)drwrap_get_arg(wrapctx, 0);
+    fn_QUrl_const(qurl_ret_ptr, local_qstring, 0); // 0 is TolerantMode
+
+    drwrap_skip_call(wrapctx, NULL, 0);
+}
+
+static void pre_QFileDialog_getSaveFileName(void *wrapctx, void **user_data)
+{
+    if (fn_QString_const == NULL)
+        return;
+
+    // The return value is passed as a pointer in the first argument (sret)
+    void *qstring_ret_ptr = (void *)drwrap_get_arg(wrapctx, 0);
+    fn_QString_const(qstring_ret_ptr, SAVE_FILE);
+    drwrap_skip_call(wrapctx, NULL, 0);
+}
+
+static void pre_QFileDialog_getSaveFileUrl(void *wrapctx, void **user_data)
+{
+    if (fn_QString_const == NULL || fn_QUrl_const == NULL)
+        return;
+
+    const char *prefix = "file:///";
+    char urlbuf[MAX_PATH + 10];
+    snprintf(urlbuf, sizeof(urlbuf), "%s%s", prefix, SAVE_FILE);
+    
     // Replace backslashes for URL format
     for (char *p = urlbuf; *p; ++p)
     {
@@ -116,25 +184,54 @@ static void pre_QFileDialog_getOpenFileUrl(void *wrapctx, void **user_data)
 
 // --- COM Wrapping Logic ---
 
+const int TYPE_IFileOpenDialog = 1;
+const int TYPE_IFileSaveDialog = 2;
+
+struct CoCreateInstance_data {
+    int type;
+    void *dialog;
+};
+
 static void pre_CoCreateInstance(void *wrapctx, void **user_data)
 {
+    *user_data = NULL;
+
     // Arguments: rclsid, pUnkOuter, dwClsContext, riid, ppv
     const IID *riid = (const IID *)drwrap_get_arg(wrapctx, 3);
     const CLSID *rclsid = (const CLSID *)drwrap_get_arg(wrapctx, 0);
+    if (!rclsid || !riid) return;
 
-    // We are only interested in the creation of a FileOpenDialog
-    if (rclsid != NULL && IsEqualIID(rclsid, &CLSID_FileOpenDialog) &&
-        riid != NULL && IsEqualIID(riid, &IID_IFileOpenDialog))
+    int type = 0;
+    void *dialog = NULL;
+
+    if (IsEqualIID(rclsid, &CLSID_FileOpenDialog) && IsEqualIID(riid, &IID_IFileOpenDialog))
     {
-
         dr_printf("drwrap: Intercepting CoCreateInstance for FileOpenDialog\n");
         // Pass the pointer to the output interface pointer (ppv) to the post-hook
-        *user_data = drwrap_get_arg(wrapctx, 4);
+        dialog = drwrap_get_arg(wrapctx, 4);
+        type = TYPE_IFileOpenDialog;
     }
-    else
+
+    if (IsEqualIID(rclsid, &CLSID_FileSaveDialog) && IsEqualIID(riid, &IID_IFileSaveDialog))
     {
-        *user_data = NULL;
+        dr_printf("drwrap: Intercepting CoCreateInstance for FileSaveDialog\n");
+        // Pass the pointer to the output interface pointer (ppv) to the post-hook
+        dialog = drwrap_get_arg(wrapctx, 4);
+        type = TYPE_IFileSaveDialog;
     }
+
+    if (!type || !dialog) return;
+
+    struct CoCreateInstance_data *m_user_data = malloc(sizeof(*m_user_data));
+    if (!m_user_data) {
+        perror("malloc");
+        dr_exit_process(1);
+    }
+
+    m_user_data->type = type;
+    m_user_data->dialog = dialog;
+
+    *user_data = (void *)m_user_data;
 }
 
 static void post_CoCreateInstance(void *wrapctx, void *user_data)
@@ -143,31 +240,76 @@ static void post_CoCreateInstance(void *wrapctx, void *user_data)
     if (!user_data)
         return;
 
+    struct CoCreateInstance_data m_user_data;
+    m_user_data = *(struct CoCreateInstance_data *)user_data;
+
+    free(user_data);
+
+
     HRESULT hr = (HRESULT)drwrap_get_retval(wrapctx);
     if (SUCCEEDED(hr))
     {
-        // The user_data is the ppv argument from the pre-hook
-        IFileOpenDialog **ppv = (IFileOpenDialog **)user_data;
-        if (ppv && *ppv)
-        {
+        if (m_user_data.type == TYPE_IFileOpenDialog) {
+            IFileOpenDialog **ppv = (IFileOpenDialog **)m_user_data.dialog;
+            if (!ppv || !*ppv) return;
+            
             IFileOpenDialog *fod = *ppv;
             
+            WCHAR wfile[MAX_PATH];
+            mbstowcs(wfile, OPEN_FILE, MAX_PATH - 1);
+            wfile[MAX_PATH - 1] = L'\0';
+
+            fod->lpVtbl->SetFileName(fod, wfile);
+
             customFODVtbl = *fod->lpVtbl;
             customFODVtbl.Show = custom_IFileDialog_Show;
-            customFODVtbl.GetResult = custom_IFileDialog_GetResult;
+            customFODVtbl.GetResult = custom_IFileOpenDialog_GetResult;
 
             fod->lpVtbl = &customFODVtbl;
         }
+
+        if (m_user_data.type == TYPE_IFileSaveDialog) {
+            IFileSaveDialog **ppv = (IFileSaveDialog **)m_user_data.dialog;
+            if (!ppv || !*ppv) return;
+            
+            IFileSaveDialog *fsd = *ppv;
+            
+            WCHAR wfile[MAX_PATH];
+            mbstowcs(wfile, SAVE_FILE, MAX_PATH - 1);
+            wfile[MAX_PATH - 1] = L'\0';
+
+            customFSDVtbl = *fsd->lpVtbl;
+            customFSDVtbl.Show = custom_IFileDialog_Show;
+            customFSDVtbl.GetResult = custom_IFileSaveDialog_GetResult;
+
+            fsd->lpVtbl = &customFSDVtbl;
+        }
     }
 }
 
-static HRESULT custom_IFileDialog_Show(void *self, void *b) {
+static HRESULT custom_IFileDialog_Show(void *self, void *b)
+{
     return S_OK;
 }
 
-static HRESULT custom_IFileDialog_GetResult(void *self, IShellItem **ppsitem) {
+static HRESULT custom_IFileSaveDialog_GetResult(void *self, IShellItem **ppsitem)
+{
     WCHAR file[MAX_PATH];
-    mbstowcs(file, CUSTOM_FILE, MAX_PATH);
+    mbstowcs(file, SAVE_FILE, MAX_PATH);
+    file[MAX_PATH - 1] = L'\0';
+
+    HANDLE handle = CreateFileA(SAVE_FILE, GENERIC_ALL,
+                                FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+                                NULL, CREATE_NEW, FILE_ATTRIBUTE_NORMAL, NULL);
+    CloseHandle(handle);
+
+    return fn_SHCreateItemFromParsingName(file, NULL, &IID_IShellItem, (void **)ppsitem);
+}
+
+static HRESULT custom_IFileOpenDialog_GetResult(void *self, IShellItem **ppsitem)
+{
+    WCHAR file[MAX_PATH];
+    mbstowcs(file, OPEN_FILE, MAX_PATH);
     file[MAX_PATH - 1] = L'\0';
 
     return fn_SHCreateItemFromParsingName(file, NULL, &IID_IShellItem, (void **)ppsitem);
@@ -190,11 +332,11 @@ static void event_module_load(void *drcontext, const module_data_t *mod, bool lo
         }                                                                                  \
     }
 
-#define GET_FUNCTION_POINTER(var, name)                                                        \
+#define GET_FUNCTION_POINTER(var, name)                                                              \
     {                                                                                                \
         if (var == NULL)                                                                             \
         {                                                                                            \
-            var = (void *)dr_get_proc_address(mod->handle, name);                                      \
+            var = (void *)dr_get_proc_address(mod->handle, name);                                    \
             if (var != NULL)                                                                         \
                 dr_printf("Found function pointer %s in %s\n", name, dr_module_preferred_name(mod)); \
         }                                                                                            \
@@ -203,18 +345,21 @@ static void event_module_load(void *drcontext, const module_data_t *mod, bool lo
     // WinAPI Hooks
     WRAP_FUNCTION("GetOpenFileNameA", pre_GetOpenFileNameA, NULL);
     WRAP_FUNCTION("GetOpenFileNameW", pre_GetOpenFileNameW, NULL);
+    WRAP_FUNCTION("GetSaveFileNameA", pre_GetSaveFileNameA, NULL);
+    WRAP_FUNCTION("GetSaveFileNameW", pre_GetSaveFileNameW, NULL);
     WRAP_FUNCTION("CoCreateInstance", pre_CoCreateInstance, post_CoCreateInstance);
 
     // Qt Hooks
     WRAP_FUNCTION(MANGLED_QFileDialog_getOpenFileName, pre_QFileDialog_getOpenFileName, NULL);
     WRAP_FUNCTION(MANGLED_QFileDialog_getOpenFileUrl, pre_QFileDialog_getOpenFileUrl, NULL);
+    WRAP_FUNCTION(MANGLED_QFileDialog_getSaveFileName, pre_QFileDialog_getSaveFileName, NULL);
+    WRAP_FUNCTION(MANGLED_QFileDialog_getSaveFileUrl, pre_QFileDialog_getSaveFileUrl, NULL);
 
     // Get pointers to functions we need to call ourselves
     GET_FUNCTION_POINTER(fn_QString_const, MANGLED_QString_const);
     GET_FUNCTION_POINTER(fn_QUrl_const, MANGLED_QUrl_const);
     GET_FUNCTION_POINTER(fn_CoTaskMemAlloc, "CoTaskMemAlloc");
     GET_FUNCTION_POINTER(fn_SHCreateItemFromParsingName, "SHCreateItemFromParsingName");
-    
 }
 
 static void event_exit(void)

programs/build.bat

@@ -1,10 +1,11 @@
 cl /Fe:compiled\Foo.exe source\Foo.c /Zi /Od /link /MACHINE:X64
 
 cl /Fe:compiled\GetOpenFileNameA.exe comdlg32.lib source\GetOpenFileNameA.c /Zi /Od /link /MACHINE:X64
-
 cl /Fe:compiled\GetOpenFileNameW.exe comdlg32.lib source\GetOpenFileNameA.c /Zi /Od /link /MACHINE:X64
-
-cl /Fe:compiled\IFileDialog.exe uuid.lib ole32.lib source\IFileDialog.c /Zi /Od /link /MACHINE:X64
+cl /Fe:compiled\GetSaveFileNameA.exe comdlg32.lib source\GetSaveFileNameA.c /Zi /Od /link /MACHINE:X64
+cl /Fe:compiled\GetSaveFileNameW.exe comdlg32.lib source\GetSaveFileNameA.c /Zi /Od /link /MACHINE:X64
+cl /Fe:compiled\IFileOpenDialog.exe uuid.lib ole32.lib source\IFileOpenDialog.c /Zi /Od /link /MACHINE:X64
+cl /Fe:compiled\IFileSaveDialog.exe uuid.lib ole32.lib source\IFileSaveDialog.c /Zi /Od /link /MACHINE:X64
 
 qmake source\QT_getOpenFileContent.pro
 nmake
@@ -21,5 +22,11 @@ nmake
 qmake source\QT_getOpenFileUrls.pro
 nmake
 
+qmake source\QT_getSaveFileName.pro
+nmake
+
+qmake source\QT_getSaveFileUrl.pro
+nmake
+
 qmake source\QT_TestLib.pro
 nmake -f Makefile.Debug

programs/source/GetSaveFileNameA.c

@@ -0,0 +1,42 @@
+#include <windows.h>
+#include <commdlg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int main() {
+    char file[MAX_PATH] = {0};
+
+    OPENFILENAME ofn = {
+        .lStructSize = sizeof(ofn),
+        .lpstrFilter = "Text Files\0*.txt\0All Files\0*.*\0",
+        .lpstrFile = file,
+        .nMaxFile = MAX_PATH,
+        .lpstrTitle = "Save File As",
+        .Flags = OFN_PATHMUSTEXIST | OFN_OVERWRITEPROMPT
+    };
+
+    int res = GetSaveFileNameA(&ofn);
+
+    if (!res) {
+        puts("File selection cancelled or failed!");
+        exit(1);
+    }
+
+    FILE *f = fopen(ofn.lpstrFile, "w");
+    if (!f) {
+        perror("Error opening file for writing");
+        exit(1);
+    }
+
+    if (fprintf(f, "foo") < 0) {
+        perror("Error writing to file");
+        fclose(f);
+        exit(1);
+    } else {
+        printf("Successfully wrote \"foo\" to '%s'.\n", ofn.lpstrFile);
+    }
+
+    fclose(f);
+
+    return 0;
+}

programs/source/GetSaveFileNameW.c

@@ -0,0 +1,42 @@
+#include <windows.h>
+#include <commdlg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int main() {
+    WCHAR file[MAX_PATH] = {0};
+
+    OPENFILENAMEW ofn = {
+        .lStructSize = sizeof(ofn),
+        .lpstrFilter = L"Text Files\0*.txt\0All Files\0*.*\0",
+        .lpstrFile = file,
+        .nMaxFile = MAX_PATH,
+        .lpstrTitle = L"Select File to Write To",
+        .Flags = OFN_FILEMUSTEXIST | OFN_PATHMUSTEXIST
+    };
+
+    int res = GetOpenFileNameW(&ofn);
+
+    if (!res) {
+        _putws(L"File selection cancelled or failed!");
+        exit(1);
+    }
+
+    FILE *f = _wfopen(ofn.lpstrFile, L"w");
+    if (!f) {
+        _wperror(L"Error opening file for writing");
+        exit(1);
+    }
+
+    if (fwprintf(f, L"foo") < 0) {
+        _wperror(L"Error writing to file");
+        fclose(f);
+        exit(1);
+    } else {
+        wprintf(L"Successfully wrote \"foo\" to '%s'.\n", ofn.lpstrFile);
+    }
+
+    fclose(f);
+
+    return 0;
+}

programs/source/IFileOpenDialog.c

@@ -1,5 +1,5 @@
 #include <windows.h>
-#include <shobjidl.h> // Required for IFileDialog and related interfaces
+#include <shobjidl.h>
 #include <stdio.h>
 #include <stdlib.h>
 

programs/source/IFileSaveDialog.c

@@ -0,0 +1,82 @@
+#include <windows.h>
+#include <shobjidl.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int main() {
+    HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE);
+    if (FAILED(hr)) {
+        fprintf(stderr, "CoInitializeEx failed: 0x%lx\n", hr);
+        exit(1);
+    }
+
+    char file[MAX_PATH] = {0};
+    IFileSaveDialog *pFileSave = NULL;
+    IShellItem *pItem = NULL;
+    PWSTR pszFilePath = NULL;
+
+    hr = CoCreateInstance(&CLSID_FileSaveDialog, NULL, CLSCTX_ALL,
+                          &IID_IFileSaveDialog, (void**)&pFileSave);
+
+    if (SUCCEEDED(hr)) {
+        COMDLG_FILTERSPEC rgSpec[] = {{L"All Files",      L"*.*"}};
+        pFileSave->lpVtbl->SetFileTypes(pFileSave, ARRAYSIZE(rgSpec), rgSpec);
+
+        pFileSave->lpVtbl->SetTitle(pFileSave, L"Save File As");
+
+        DWORD dwFlags;
+        pFileSave->lpVtbl->GetOptions(pFileSave, &dwFlags);
+        pFileSave->lpVtbl->SetOptions(pFileSave, dwFlags | FOS_OVERWRITEPROMPT | FOS_PATHMUSTEXIST | FOS_NOCHANGEDIR);
+
+        hr = pFileSave->lpVtbl->Show(pFileSave, NULL);
+
+        if (SUCCEEDED(hr)) {
+            printf("GetResult...\n");
+            hr = pFileSave->lpVtbl->GetResult(pFileSave, &pItem);
+
+            if (SUCCEEDED(hr)) {
+                printf("GetDisplayName...\n");
+                hr = pItem->lpVtbl->GetDisplayName(pItem, SIGDN_FILESYSPATH, &pszFilePath);
+
+                if (SUCCEEDED(hr)) {
+                    wcstombs(file, pszFilePath, MAX_PATH);
+                    printf("Selected file: %s\n", file);
+                }
+            }
+        }
+    }
+
+    if (pszFilePath) {
+        CoTaskMemFree(pszFilePath);
+    }
+    if (pItem) {
+        pItem->lpVtbl->Release(pItem);
+    }
+    if (pFileSave) {
+        pFileSave->lpVtbl->Release(pFileSave);
+    }
+    CoUninitialize();
+
+    if (FAILED(hr) || file[0] == '\0') {
+        puts("File selection cancelled or failed.");
+        exit(1);
+    }
+
+    FILE *f = fopen(file, "w");
+    if (!f) {
+        perror("Error opening file for writing");
+        exit(1);
+    }
+
+    if (fprintf(f, "foo") < 0) {
+        perror("Error writing to file");
+        fclose(f);
+        exit(1);
+    } else {
+        puts("Successfully wrote \"foo\" to the file.");
+    }
+
+    fclose(f);
+
+    return 0;
+}

programs/source/QT_getSaveFileName.cpp

@@ -0,0 +1,34 @@
+#include <QApplication>
+#include <QFileDialog>
+#include <QFile>
+#include <QTextStream>
+#include <QDebug>
+#include <iostream>
+
+int main(int argc, char *argv[]) {
+    QApplication app(argc, argv);
+
+    QString fileName = QFileDialog::getSaveFileName(nullptr, "Select File", "", "All Files (*.*)");
+
+    if (fileName.isEmpty()) {
+        qDebug() << "File selection cancelled.";
+        return 0;
+    }
+
+    QFile file(fileName);
+
+    if (!file.open(QIODevice::WriteOnly | QIODevice::Text)) {
+        std::cerr << "Failed to open file for writing: " << file.errorString().toStdString() << std::endl;
+        return 1;
+    }
+
+    QTextStream out(&file);
+
+    out << "foo";
+
+    file.close();
+
+    qDebug() << "Successfully wrote \"foo\" to:" << fileName;
+
+    return 0;
+}

programs/source/QT_getSaveFileName.pro

@@ -0,0 +1,5 @@
+QT += core widgets
+CONFIG += console
+SOURCES += QT_getSaveFileName.cpp
+TARGET = QT_getSaveFileName
+DESTDIR = compiled

programs/source/QT_getSaveFileUrl.cpp

@@ -0,0 +1,31 @@
+#include <QApplication>
+#include <QFileDialog>
+#include <QFile>
+#include <QTextStream>
+#include <QDebug>
+#include <iostream>
+#include <QUrl>
+
+int main(int argc, char *argv[]) {
+    QApplication app(argc, argv);
+
+    QUrl url = QFileDialog::getSaveFileUrl(nullptr, "Select File", QUrl(), "All Files (*.*)");
+    if (!url.isValid() || !url.isLocalFile()) {
+        qDebug() << "File selection cancelled.";
+        return 1;
+    }
+
+    QFile file(url.toLocalFile());
+    if (!file.open(QIODevice::WriteOnly | QIODevice::Text)) {
+        std::cerr << "Failed to open file for writing: " << file.errorString().toStdString() << std::endl;
+        return 1;
+    }
+
+    QTextStream out(&file);
+    out << "foo";
+    file.close();
+
+    qDebug() << "Successfully wrote \"foo\" to:" << url.toLocalFile();
+
+    return 0;
+}

programs/source/QT_getSaveFileUrl.pro

@@ -0,0 +1,5 @@
+QT += core widgets
+CONFIG += console
+SOURCES += QT_getSaveFileUrl.cpp
+TARGET = QT_getSaveFileUrl
+DESTDIR = compiled