Disclaimer : Started this a few months back and now revisiting. Still not working much with Visual Studio and Windows API.
For the most part, the code works.
The issue is when an invalid directory reference is used, the directory string prints out incorrectly.
This is the line of code in question.
_tprintf("Invalid Handle %s <DIR>\n", ffd.cFileName);
This was a sample found and wonder if it was run with some other version of Visual Studio/Windows or project setting.
#include <windows.h>
#include <tchar.h>
#include <stdio.h>
#include <strsafe.h>
#pragma comment(lib, "User32.lib")
int _tmain(int argc, TCHAR* argv[])
{
WIN32_FIND_DATA ffd;
LARGE_INTEGER filesize;
TCHAR szDir[MAX_PATH];
size_t length_of_arg;
HANDLE hFind = INVALID_HANDLE_VALUE;
DWORD dwError = 0;
if (argc != 2)
{
_tprintf(TEXT("\nUsage: %s <directory name>\n"), argv[0]);
return (-1);
}
StringCchLength(argv[1], MAX_PATH, &length_of_arg);
if (length_of_arg > (MAX_PATH - 3))
{
_tprintf(TEXT("\nDirectory path is too long.\n"));
return (-1);
}
_tprintf(TEXT("\nTarget directory is %s\n\n"), argv[1]);
StringCchCopy(szDir, MAX_PATH, argv[1]);
StringCchCat(szDir, MAX_PATH, TEXT("\\*"));
hFind = FindFirstFile(szDir, &ffd);
if (INVALID_HANDLE_VALUE == hFind)
{
_tprintf("Invalid Handle %s <DIR>\n", ffd.cFileName);
return dwError;
}
:
///Doing other stuff here....
:
FindClose(hFind);
return dwError;
}
I try to build ipref3.dll for windows
I found How to compile iperf3 for Windows
Built it but i got only iperf3.exe and libiperf.a
I found, how create dll manual
gcc -s -shared -o iperf3.dll units.o timer.o tcp_window_size.o tcp_info.o net.o iperf_util.o iperf_sctp.o iperf_udp.o iperf_tcp.o iperf_server_api.o iperf_locale.o iperf_client_api.o iperf_error.o iperf_api.o cjson.o -Wl,--enable-auto-import,--export-all-symbols,--subsystem,windows
after i found how need to initialize
HMODULE h = LoadLibrary(TEXT("cygwin1.dll"));
PFN_CYGWIN_DLL_INIT init = (PFN_CYGWIN_DLL_INIT)GetProcAddress(h, "cygwin_dll_init");
init();
Now i can load dll and make initialization but when i start test iperf_run_client application is crashed
Unhandled exception at 0x611537C0 (cygwin1.dll) in iprerf-server.exe:
0xC0000005: Access violation reading location 0x00740000.
How can solve this problem?
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <WinSock2.h>
//#include <unistd.h>
#include <string.h>
//#include <sysexits.h>
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#include "iperf_api.h"
#ifdef WIN64
#pragma comment(lib, "iperf3_64.lib")
#else
#pragma comment(lib, "iperf3.lib")
#endif
#pragma comment(lib, "ws2_32.lib")
typedef void *register_frame();
typedef int *hello_f();
typedef int(*PFN_HELLO)();
typedef void(*PFN_CYGWIN_DLL_INIT)();
#pragma pack(push, 1)
int main(int argc, char** argv)
{
WSADATA wsaData;
int wsaErr = WSAStartup(MAKEWORD(2, 2), &wsaData);
if (wsaErr != 0) {
printf("WSAStartup failed with error: %d\n", wsaErr);
return 1;
}
//PFN_HELLO fnHello;
HMODULE /*hLib, */h = LoadLibrary(TEXT("cygwin1.dll"));
PFN_CYGWIN_DLL_INIT init = (PFN_CYGWIN_DLL_INIT)GetProcAddress(h, "cygwin_dll_init");
init();
char* argv0;
char* host;
int port;
struct iperf_test *test;
argv0 = strrchr(argv[0], '/');
if (argv0 != (char*)0)
++argv0;
else
argv0 = argv[0];
if (argc != 3) {
fprintf(stderr, "usage: %s [host] [port]\n", argv0);
exit(EXIT_FAILURE);
}
host = argv[1];
port = atoi(argv[2]);
test = iperf_new_test();
if (test == NULL) {
fprintf(stderr, "%s: failed to create test\n", argv0);
exit(EXIT_FAILURE);
}
iperf_defaults(test);
iperf_set_verbose(test, 1);
iperf_set_test_role(test, 'c');
iperf_set_test_server_hostname(test, host);
iperf_set_test_server_port(test, port);
/* iperf_set_test_reverse( test, 1 ); */
iperf_set_test_omit(test, 3);
iperf_set_test_duration(test, 5);
iperf_set_test_reporter_interval(test, 1);
iperf_set_test_stats_interval(test, 1);
/* iperf_set_test_json_output( test, 1 ); */
if (iperf_run_client(test) < 0) {
fprintf(stderr, "%s: error - %s\n", argv0, iperf_strerror(i_errno));
exit(EXIT_FAILURE);
}
if (iperf_get_test_json_output_string(test)) {
fprintf(iperf_get_test_outfile(test), "%zd bytes of JSON emitted\n",
strlen(iperf_get_test_json_output_string(test)));
}
iperf_free_test(test);
exit(EXIT_SUCCESS);
}
The reason why the shared lib is not built is:
libtool: warning: undefined symbols not allowed in x86_64-unknown-cygwin
shared libraries; building static only
the easy way to bypass it, in a clean build is to use:
$ make libiperf_la_LIBADD="-no-undefined"
The build will include the shared libray and the import library
$ find . -name "*dll*"
./src/.libs/cygiperf-0.dll
./src/.libs/libiperf.dll.a
For what I see to make a build on cygwin is also needed to remove a definition
in src/iperf_config.h after running configure
/* #define HAVE_SETPROCESSAFFINITYMASK 1 */
PS #1: iperf-2.0.5-1 is available as cygwin package
PS #2: your code is Windows-like while Cygwin is a Unix-like system, you can not mix them
I found solution
1) It need to create addition dll: my_crt0.dll
#include <sys/cygwin.h>
#include <stdlib.h>
typedef int (*MainFunc) (int argc, char *argv[], char **env);
void my_crt0 (MainFunc f)
{
cygwin_crt0(f);
}
gcc -c my_crt0.c
gcc -o my_crt0.dll my_crt0.o -s -shared -Wl,--subsystem,windows,--enable-auto-import,--export-all-symbols,--out-implib,my_crt0.lib
2) Modify main code
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <WinSock2.h>
#include <string.h>
#include "iperf_api.h"
#pragma comment(lib, "iperf3.lib")
#pragma comment(lib, "ws2_32.lib")
typedef int(*MainFunc) (int argc, char *argv[], char **env);
typedef void(*my_crt0)(MainFunc f);
int main2(int argc, char** argv, char **env)
{
char* argv0;
char* host;
int port;
struct iperf_test *test;
host = (char*)"127.0.0.1";
port = 4000;
test = iperf_new_test();
if (test == NULL) {
exit(EXIT_FAILURE);
}
iperf_defaults(test);
iperf_set_verbose(test, 1);
iperf_set_test_role(test, 'c');
iperf_set_test_server_hostname(test, host);
iperf_set_test_server_port(test, port);
/* iperf_set_test_reverse( test, 1 ); */
iperf_set_test_omit(test, 3);
iperf_set_test_duration(test, 5);
iperf_set_test_reporter_interval(test, 1);
iperf_set_test_stats_interval(test, 1);
/* iperf_set_test_json_output( test, 1 ); */
iperf_strerror(0);
if (iperf_run_client(test) < 0) {
fprintf(stderr, "%s: error - %s\n", argv0, iperf_strerror(i_errno));
exit(EXIT_FAILURE);
}
if (iperf_get_test_json_output_string(test)) {
fprintf(iperf_get_test_outfile(test), "%zd bytes of JSON emitted\n",
strlen(iperf_get_test_json_output_string(test)));
}
iperf_free_test(test);
exit(EXIT_SUCCESS);
return 1;
}
int main(int argc, char** argv)
{
WSADATA wsaData;
int wsaErr = WSAStartup(MAKEWORD(2, 2), &wsaData);
if (wsaErr != 0) {
printf("WSAStartup failed with error: %d\n", wsaErr);
return 1;
}
{
HMODULE /*hLib, */h = LoadLibrary(TEXT("my_crt0.dll"));
my_crt0 init = (my_crt0)GetProcAddress(h, "my_crt0");
init(main2);
}
exit(EXIT_SUCCESS);
}
Now it compiled and worked to VS 2015
How to determine font used for some control in some dialog window in runnning process on Windows? Something like Microsoft Spy++ does.
I did not find this functionality in Spy++, but here's a small program that I just wrote for this task:
#include <windows.h>
#include <stdio.h>
int main(int argc, char **argv)
{
if (argc != 2) {
fprintf(stderr, "Usage: findfont WINDOWTITLE\n");
return 1;
}
LPCSTR title = argv[1];
HWND hWnd = FindWindow(NULL, title);
if (hWnd == NULL) {
fprintf(stderr, "Window titled \"%s\" not found\n", title);
return 1;
}
HFONT hFont = (HFONT) SendMessage(hWnd, WM_GETFONT, 0, 0);
if (hFont == NULL) {
fprintf(stderr, "WM_GETFONT failed\n");
return 1;
}
LOGFONT lf = { 0 };
if (!GetObject(hFont, sizeof(LOGFONT), &lf)) {
fprintf(stderr, "GetObject failed\n");
return 1;
}
printf("Face name: %s Height: %ld\n", lf.lfFaceName, lf.lfHeight);
return 0;
}
Given a file that contains one integer per line, I am trying to use this code to read the file and store the numbers in a vector.
Strangely, after finishing reading the file, my program is printing the string "stoi". Is this just a behavior of std::stoi? I couldn't find anything about this in documentation.
I am using g++ 6.2.1.
Here is the relevant code:
#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include <vector>
void usage() {
std::cout << "Usage: ./binary_tree [FILE]\n";
}
int main(int argc, char* argv[]) {
try{
if (argc <= 1) {
usage();
return 1;
}
std::ifstream inputFile;
inputFile.open(argv[1], std::ios::in);
if (!inputFile.is_open()) throw std::runtime_error("Failed to open file");
std::string line;
std::vector<int> nums;
while(!inputFile.eof()) {
getline(inputFile, line);
int num = std::stoi(line);
nums.push_back(num);
}
// Clean up
inputFile.close();
return 0;
}
catch(const std::exception& e) {
std::cerr << e.what() << std::endl;
}
}
I want to use transient scrollbar (Transient scroll bars appear when the content is scrolled and disappear when they are no longer needed) in Qt application. For this purpose I have inheritanced class QproxyStyle and reimplemented function styleHint. Code placed below.
File ScrollBar.h:
#include <QStyle>
#include <QCommonStyle>
#include <QProxyStyle>
class ScrollBarStyle : public QProxyStyle
{
public:
int styleHint(StyleHint sh, const QStyleOption *opt, const QWidget *widget, QStyleHintReturn *hret) const;
};
File ScrollBar.c:
#include "ScrollBar.h"
int ScrollBarStyle::styleHint(StyleHint sh, const QStyleOption *opt, const QWidget *widget,QStyleHintReturn *hret) const
{
int ret = 0;
switch (sh) {
case SH_ScrollBar_Transient:
ret = true;
break;
default:
return QProxyStyle::styleHint(sh, opt, widget, hret);
}
return ret;
}
File MainWindow.h:
#include <QMainWindow>
#include <QTextEdit>
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = 0);
~MainWindow();
};
File MainWindow.cpp:
#include <QTextEdit>
#include "MainWindow.h"
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
QTextEdit *l = new (std::nothrow) QTextEdit(this);
if (l == 0)
return;
setCentralWidget(l);
}
MainWindow::~MainWindow()
{
}
File main.cpp:
#include "ScrollBar.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
ScrollBarStyle *style = new (std::nothrow) ScrollBarStyle;
if(style == 0)
return -1;
style->setBaseStyle(a.style());
w.show();
return a.exec();
}
But I have got a problem: transient scrollbar has been appearing only once (when text doesn't fit in the text area) then it has been disappeared and never come back visible.
So how can I fix this problem?
Thanks!
You have forgotten to set the style to application.
a.setStyle(style);