C / C++ / MFC

jkirkerx wrote:

But I guess if you run a function, the wndproc stops looping until the function stops, and then the wndproc listens again.

jkirkerx wrote:

If I run a function, I have to have a callback...

long thread_id;
HANDLE h = _beginthreadex(NULL, 0, ActuallyGetStats, NULL, 0, (unsigned *)&thread_id);

unsigned int __stdcall ActuallyGetStats(void *)
{
    // do stuff with my network connection until it's done, then return
    return ERROR_SUCCESS;
}

#define WIN32_LEAN_AND_MEAN

#include <windows.h>
#include <process.h>
#include "resource.h"
#include <stdio.h>



#define WM_THREAD_COMPLETE WM_USER+1

typedef void (*voidFuncPtr)(void*);

typedef struct
{
    int delayMs;
    int myThreadId;
    voidFuncPtr callbackFunc;
    long winThreadId;
    uintptr_t handle;
} threadHeader_t;


HINSTANCE hInst;
HWND mainDlgHwnd;
threadHeader_t threadList[10];


unsigned int __stdcall myThreadFunc(void *data)
{
    threadHeader_t *header;
    header = (threadHeader_t *)data;
    printf("In thread func %d, delay %dMs\n", header->myThreadId, header->delayMs);
    Sleep(header->delayMs);
    if (header->callbackFunc)
        header->callbackFunc(header);
    return ERROR_SUCCESS;
}

void myCompletionCallback(void *data)
{
    threadHeader_t *header;
    header = (threadHeader_t *)data;
    PostMessage(mainDlgHwnd, WM_THREAD_COMPLETE, header->myThreadId, 0);
}

void onTestBtn()
{
    int i;

    for (i=0; i<10; i++)
    {
        threadList[i].callbackFunc = myCompletionCallback;
        threadList[i].delayMs = (10-i)*1000;
        threadList[i].myThreadId = i;
        threadList[i].handle = _beginthreadex(NULL, 0, myThreadFunc, &threadList[i], 0, (unsigned *)&threadList[i].winThreadId);
    }
}


BOOL CALLBACK DialogProc(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch(uMsg)
    {
        case WM_INITDIALOG:
            mainDlgHwnd = hwndDlg;
            return TRUE;

        case WM_CLOSE:
            EndDialog(hwndDlg, 0);
            return TRUE;

        case WM_THREAD_COMPLETE:
            MessageBeep(MB_OK);
            return true;

        case WM_COMMAND:
            switch(LOWORD(wParam))
            {
                case IDC_BTN_TEST:
                    onTestBtn();
                    return TRUE;

                case IDC_BTN_QUIT:
                    EndDialog(hwndDlg, 0);
                    return TRUE;
            }
    }

    return FALSE;
}


int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
    hInst = hInstance;
    return DialogBox(hInstance, MAKEINTRESOURCE(DLG_MAIN), NULL, (DLGPROC)DialogProc);
}

jkirkerx wrote:

I 'm not really sure what MFC is

jkirkerx wrote:

Does it make real windows programs?.

void CScreenShotDlg::OnPaint()
{
    // device context for painting
    CPaintDC dc(this);

    // Get the window handle of the application.
    HWND hWnd = ::FindWindow( 0, _T( "myWindow" ));

    // Take screenshot.
    PrintWindow( hWnd,
                 dc.GetSafeHdc(),
                 0 );
}