C / C++ / MFC

int iVal = 100;
TCHAR buf[100];
_sntprintf(buf, "this is my integer: %d", iVal);
MessageBox(buf);

egerving wrote:

use the MessageBox function a lot to see what going on with code

egerving wrote:

API functions that return various types

Adassus wrote:

Im having a bit of trouble compiling a simple program

int nResult=MessageBox(NULL,L"An example of Cancel,Retry,Continue",L"Hello MessageBox!",MB_ICONERROR|MB_ABORTRETRYIGNORE);

#include <windows.h>

LRESULT CALLBACK WinProc(HWND hWnd,UINT message,WPARAM wParam,LPARAM lParam);

int WINAPI WinMain(HINSTANCE hInst,HINSTANCE hPrevInst,LPSTR lpCmdLine,int nShowCmd)
{
	WNDCLASSEX wClass;
	ZeroMemory(&wClass,sizeof(WNDCLASSEX));
	wClass.cbClsExtra=NULL;
	wClass.cbSize=sizeof(WNDCLASSEX);
	wClass.cbWndExtra=NULL;
	wClass.hbrBackground=(HBRUSH)COLOR_WINDOW;
	wClass.hCursor=LoadCursor(NULL,IDC_ARROW);
	wClass.hIcon=NULL;
	wClass.hIconSm=NULL;
	wClass.hInstance=hInst;
	wClass.lpfnWndProc=(WNDPROC)WinProc;
	wClass.lpszClassName="Window Class";
	wClass.lpszMenuName=NULL;
	wClass.style=CS_HREDRAW|CS_VREDRAW;

	if(!RegisterClassEx(&wClass))
	{
		int nResult=GetLastError();
		MessageBox(NULL,
			"Window class creation failed",
			"Window Class Failed",
			MB_ICONERROR);
	}

	HWND hWnd=CreateWindowEx(NULL,
			"Window Class",
			"Windows application",
			WS_OVERLAPPEDWINDOW,
			200,
			200,
			640,
			480,
			NULL,
			NULL,
			hInst,
			NULL);

	if(!hWnd)
	{
		int nResult=GetLastError();

		MessageBox(NULL,
			"Window creation failed",
			"Window Creation Failed",
			MB_ICONERROR);
	}

	ShowWindow(hWnd,nShowCmd);

	MSG msg;
	ZeroMemory(&msg,sizeof(MSG));

	while(GetMessage(&msg,NULL,0,0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	return 0;
}

LRESULT CALLBACK WinProc(HWND hWnd,UINT msg,WPARAM wParam,LPARAM lParam)
{
	switch(msg)
	{
		case WM_DESTROY:
		{
			PostQuitMessage(0);
			return 0;
		}
		break;
	}

	return DefWindowProc(hWnd,msg,wParam,lParam);
}

DriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] = SomeFunction

hFileHandle = INVALID_HANDLE_VALUE;
                //open handle
                hFileHandle = CreateFile("{00873fdf-61a8-11d1-aa5e-00c04fb1728b}", 
                                         GENERIC_READ | 
                                         GENERIC_WRITE,
                                         0,
                                         (IntPtr)0,
                                         OPEN_EXISTING,
                                         0,
                                         NULL);

                if (hFileHandle == INVALID_HANDLE_VALUE)
                {
                    Console.WriteLine("Cannot open driver handle");
                    return;
                }

TeslaShock wrote:

and then goes the reversed RGB data

transoft wrote:

I have a "CButton" which pointer should be available.

transoft wrote:

I plan to use GetDlgItem() to get it. But this function only functions correctly in "OnInitDialog".