Programming Forums > Application Development > C

Viper187 · Jun 1st, 2008, 1:41 PM

I've been programming in C, VB6, PHP, etc for a long time, but I was always too lazy to learn how to write C apps with GUIs. Now I decided to try my hand at it, and I'm kind of stumped. I use Dev-C++ and this code is compiling fine, but it refuses to run. I get the error: "Could not create main dialog"

If I can get something going to start with, figuring out how to access each control shouldn't be very hard. I should hopefully be able to just Google for anything I get hung up on.

ELFedit.c:

 c Syntax (Toggle Plain Text) 
 
#include "ELFedit.h"
 
BOOL CALLBACK MainCallB(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam) {
	LOGFONT lf;
 
	switch(uMsg) {
		case WM_INITDIALOG:
 
			//setup font
			hFont = (HFONT)SendMessage(hwndDlg, WM_GETFONT, 0, 0);
			GetObject(hFont, sizeof(LOGFONT), &lf);
			strcpy(lf.lfFaceName,"Courier");
			hNewFont = CreateFontIndirect(&lf);
 
			SendDlgItemMessage(hwndDlg,101,WM_SETFONT,(WPARAM)hNewFont,FALSE);
			SendDlgItemMessage(hwndDlg,102,WM_SETFONT,(WPARAM)hNewFont,FALSE);
			SendDlgItemMessage(hwndDlg,103,WM_SETFONT,(WPARAM)hNewFont,FALSE);
 
			//set text limits
			SendDlgItemMessage(hwndDlg,101,EM_SETLIMITTEXT,(TEXTSIZE-1),0);
			SendDlgItemMessage(hwndDlg,103,EM_SETLIMITTEXT,3,0);
 
			//tick checkbox
			CheckDlgButton(hwndDlg,401,BST_CHECKED);
 
 
			break;
		case WM_CLOSE:
		case WM_QUIT:
//			gcncryptKill();
			break;
		case WM_COMMAND:
			switch(HIWORD(wParam)) {
				case BN_CLICKED:
					switch(LOWORD(wParam)) {
						case 201: //Decrypt
//							DecryptParseList();
							break;
						case 202: //Encrypt
//							EncryptParseList();
							break;
						case 301: //Close
//							gcncryptKill();
							break;
						case 302: //Clear (input)
							SetDlgItemText(hwndDlg,101,"");
							break;
						case 303: //Clear (output)
							SetDlgItemText(hwndDlg,102,"");
							break;
						case 401: //Game ID:
//							SendDlgItemMessage(hwndDlg,103,EM_SETREADONLY,dogameid^1,0);
//							EnableWindow(GetDlgItem(hwndDlg,501),dogameid);
							break;
					}
					break;
			}
			break;
	}
	return FALSE;
}
 
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hprevinstance, LPSTR lpcmdline, int ncmdshow) {
	MSG msg;
	RECT wndRect,dskRect;
	int w,h;
 
	ghInstance = hInstance;
	hWindow = CreateDialog(ghInstance,"MAIN",NULL,MainCallB);
	if (!hWindow) {
		MessageBox(NULL, "Could not create main dialog", "ERROR", MB_ICONERROR | MB_OK);
		return 0;
	}
 
	//load and set dialog icons
	iWindow = LoadIcon(ghInstance,"ICON");
	SendMessage(hWindow,WM_SETICON,ICON_BIG,(LPARAM)iWindow);
	SendMessage(hWindow,WM_SETICON,ICON_SMALL,(LPARAM)iWindow);
 
	//change title bar to include version number
	SetWindowText(hWindow, TITLEBAR);
 
	//center dialog on screen
	GetWindowRect(hWindow,&wndRect);
	GetWindowRect(GetDesktopWindow(),&dskRect);
	w = (wndRect.right-wndRect.left);
	h = (wndRect.bottom-wndRect.top);
	MoveWindow(hWindow,((dskRect.right/2)-(w/2)),((dskRect.bottom/2)-(h/2)),w,h,TRUE);
 
	//display dialog
	ShowWindow(hWindow,ncmdshow);
	UpdateWindow(hWindow);
 
	while (hWindow) {
		if (GetMessage(&msg,NULL,0,0)) {
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}
 
	return msg.wParam;
}
#include "ELFedit.h"

BOOL CALLBACK MainCallB(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam) {
	LOGFONT lf;

	switch(uMsg) {
		case WM_INITDIALOG:
  
			//setup font
			hFont = (HFONT)SendMessage(hwndDlg, WM_GETFONT, 0, 0);
			GetObject(hFont, sizeof(LOGFONT), &lf);
			strcpy(lf.lfFaceName,"Courier");
			hNewFont = CreateFontIndirect(&lf);

			SendDlgItemMessage(hwndDlg,101,WM_SETFONT,(WPARAM)hNewFont,FALSE);
			SendDlgItemMessage(hwndDlg,102,WM_SETFONT,(WPARAM)hNewFont,FALSE);
			SendDlgItemMessage(hwndDlg,103,WM_SETFONT,(WPARAM)hNewFont,FALSE);

			//set text limits
			SendDlgItemMessage(hwndDlg,101,EM_SETLIMITTEXT,(TEXTSIZE-1),0);
			SendDlgItemMessage(hwndDlg,103,EM_SETLIMITTEXT,3,0);

			//tick checkbox
			CheckDlgButton(hwndDlg,401,BST_CHECKED);


			break;
		case WM_CLOSE:
		case WM_QUIT:
//			gcncryptKill();
			break;
		case WM_COMMAND:
			switch(HIWORD(wParam)) {
				case BN_CLICKED:
					switch(LOWORD(wParam)) {
						case 201: //Decrypt
//							DecryptParseList();
							break;
						case 202: //Encrypt
//							EncryptParseList();
							break;
						case 301: //Close
//							gcncryptKill();
							break;
						case 302: //Clear (input)
							SetDlgItemText(hwndDlg,101,"");
							break;
						case 303: //Clear (output)
							SetDlgItemText(hwndDlg,102,"");
							break;
						case 401: //Game ID:
//							SendDlgItemMessage(hwndDlg,103,EM_SETREADONLY,dogameid^1,0);
//							EnableWindow(GetDlgItem(hwndDlg,501),dogameid);
							break;
					}
					break;
			}
			break;
	}
	return FALSE;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hprevinstance, LPSTR lpcmdline, int ncmdshow) {
	MSG msg;
	RECT wndRect,dskRect;
	int w,h;

	ghInstance = hInstance;
	hWindow = CreateDialog(ghInstance,"MAIN",NULL,MainCallB);
	if (!hWindow) {
		MessageBox(NULL, "Could not create main dialog", "ERROR", MB_ICONERROR | MB_OK);
		return 0;
	}

	//load and set dialog icons
	iWindow = LoadIcon(ghInstance,"ICON");
	SendMessage(hWindow,WM_SETICON,ICON_BIG,(LPARAM)iWindow);
	SendMessage(hWindow,WM_SETICON,ICON_SMALL,(LPARAM)iWindow);

	//change title bar to include version number
	SetWindowText(hWindow, TITLEBAR);

	//center dialog on screen
	GetWindowRect(hWindow,&wndRect);
	GetWindowRect(GetDesktopWindow(),&dskRect);
	w = (wndRect.right-wndRect.left);
	h = (wndRect.bottom-wndRect.top);
	MoveWindow(hWindow,((dskRect.right/2)-(w/2)),((dskRect.bottom/2)-(h/2)),w,h,TRUE);

	//display dialog
	ShowWindow(hWindow,ncmdshow);
	UpdateWindow(hWindow);

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

	return msg.wParam;
}

ELFedit.h:

 c Syntax (Toggle Plain Text) 
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
//win32 stuff
#define TITLEBAR "ELF Edit v0.0"
#define TEXTSIZE 32767
 
HWND hWindow;
HINSTANCE ghInstance;
HICON iWindow;
HFONT hFont,hNewFont;
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

//win32 stuff
#define TITLEBAR "ELF Edit v0.0"
#define TEXTSIZE 32767

HWND hWindow;
HINSTANCE ghInstance;
HICON iWindow;
HFONT hFont,hNewFont;

Main.rc:

 c Syntax (Toggle Plain Text) 
#include <windows.h>
#define MAIN 1000
#define ELFDIS 1001
 
MAIN DIALOGEX 6,6,409,243
CAPTION "ELF Edit"
FONT 8,"MS Sans Serif",0,0,0
STYLE WS_VISIBLE|WS_OVERLAPPEDWINDOW
BEGIN
  CONTROL "",ELFDIS,"ListBox",WS_CHILD|WS_VISIBLE|WS_TABSTOP|LBS_NOINTEGRALHEIGHT|LBS_HASSTRINGS|LBS_NOTIFY,16,22,378,201,WS_EX_CLIENTEDGE
END
#include <windows.h>
#define MAIN 1000
#define ELFDIS 1001

MAIN DIALOGEX 6,6,409,243
CAPTION "ELF Edit"
FONT 8,"MS Sans Serif",0,0,0
STYLE WS_VISIBLE|WS_OVERLAPPEDWINDOW
BEGIN
  CONTROL "",ELFDIS,"ListBox",WS_CHILD|WS_VISIBLE|WS_TABSTOP|LBS_NOINTEGRALHEIGHT|LBS_HASSTRINGS|LBS_NOTIFY,16,22,378,201,WS_EX_CLIENTEDGE
END

The Dark · Jun 2nd, 2008, 5:28 PM

You should return TRUE in your callback function when you handle a message, this might be causing the problem, as Windows thinks you haven't handled the INITDIALOG message.
You can use GetLastError and FormatMessage after the CreateDialog call fails to get a more detailed error description, it might point you in the right direction.

Viper187 · Jun 3rd, 2008, 12:47 PM

I finally found a good tutorial to work from. http://www.winprog.org/tutorial/

Now I'd love it if someone could tell me how inline assemblers work. Is it possible to enable editing a single row in a listbox? Or is it some special grid/excel spreadsheet-like control?

Jun 1st, 2008, 1:41 PM	#1
Viper187 Newbie Join Date: Jun 2008 Posts: 2 Rep Power: 0	Need help getting an API app started/working I've been programming in C, VB6, PHP, etc for a long time, but I was always too lazy to learn how to write C apps with GUIs. Now I decided to try my hand at it, and I'm kind of stumped. I use Dev-C++ and this code is compiling fine, but it refuses to run. I get the error: "Could not create main dialog" If I can get something going to start with, figuring out how to access each control shouldn't be very hard. I should hopefully be able to just Google for anything I get hung up on. ELFedit.c: c Syntax (Toggle Plain Text) #include "ELFedit.h" BOOL CALLBACK MainCallB(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam) { LOGFONT lf; switch(uMsg) { case WM_INITDIALOG: //setup font hFont = (HFONT)SendMessage(hwndDlg, WM_GETFONT, 0, 0); GetObject(hFont, sizeof(LOGFONT), &lf); strcpy(lf.lfFaceName,"Courier"); hNewFont = CreateFontIndirect(&lf); SendDlgItemMessage(hwndDlg,101,WM_SETFONT,(WPARAM)hNewFont,FALSE); SendDlgItemMessage(hwndDlg,102,WM_SETFONT,(WPARAM)hNewFont,FALSE); SendDlgItemMessage(hwndDlg,103,WM_SETFONT,(WPARAM)hNewFont,FALSE); //set text limits SendDlgItemMessage(hwndDlg,101,EM_SETLIMITTEXT,(TEXTSIZE-1),0); SendDlgItemMessage(hwndDlg,103,EM_SETLIMITTEXT,3,0); //tick checkbox CheckDlgButton(hwndDlg,401,BST_CHECKED); break; case WM_CLOSE: case WM_QUIT: // gcncryptKill(); break; case WM_COMMAND: switch(HIWORD(wParam)) { case BN_CLICKED: switch(LOWORD(wParam)) { case 201: //Decrypt // DecryptParseList(); break; case 202: //Encrypt // EncryptParseList(); break; case 301: //Close // gcncryptKill(); break; case 302: //Clear (input) SetDlgItemText(hwndDlg,101,""); break; case 303: //Clear (output) SetDlgItemText(hwndDlg,102,""); break; case 401: //Game ID: // SendDlgItemMessage(hwndDlg,103,EM_SETREADONLY,dogameid^1,0); // EnableWindow(GetDlgItem(hwndDlg,501),dogameid); break; } break; } break; } return FALSE; } int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hprevinstance, LPSTR lpcmdline, int ncmdshow) { MSG msg; RECT wndRect,dskRect; int w,h; ghInstance = hInstance; hWindow = CreateDialog(ghInstance,"MAIN",NULL,MainCallB); if (!hWindow) { MessageBox(NULL, "Could not create main dialog", "ERROR", MB_ICONERROR \| MB_OK); return 0; } //load and set dialog icons iWindow = LoadIcon(ghInstance,"ICON"); SendMessage(hWindow,WM_SETICON,ICON_BIG,(LPARAM)iWindow); SendMessage(hWindow,WM_SETICON,ICON_SMALL,(LPARAM)iWindow); //change title bar to include version number SetWindowText(hWindow, TITLEBAR); //center dialog on screen GetWindowRect(hWindow,&wndRect); GetWindowRect(GetDesktopWindow(),&dskRect); w = (wndRect.right-wndRect.left); h = (wndRect.bottom-wndRect.top); MoveWindow(hWindow,((dskRect.right/2)-(w/2)),((dskRect.bottom/2)-(h/2)),w,h,TRUE); //display dialog ShowWindow(hWindow,ncmdshow); UpdateWindow(hWindow); while (hWindow) { if (GetMessage(&msg,NULL,0,0)) { TranslateMessage(&msg); DispatchMessage(&msg); } } return msg.wParam; } #include "ELFedit.h" BOOL CALLBACK MainCallB(HWND hwndDlg, UINT uMsg, WPARAM wParam, LPARAM lParam) { LOGFONT lf; switch(uMsg) { case WM_INITDIALOG: //setup font hFont = (HFONT)SendMessage(hwndDlg, WM_GETFONT, 0, 0); GetObject(hFont, sizeof(LOGFONT), &lf); strcpy(lf.lfFaceName,"Courier"); hNewFont = CreateFontIndirect(&lf); SendDlgItemMessage(hwndDlg,101,WM_SETFONT,(WPARAM)hNewFont,FALSE); SendDlgItemMessage(hwndDlg,102,WM_SETFONT,(WPARAM)hNewFont,FALSE); SendDlgItemMessage(hwndDlg,103,WM_SETFONT,(WPARAM)hNewFont,FALSE); //set text limits SendDlgItemMessage(hwndDlg,101,EM_SETLIMITTEXT,(TEXTSIZE-1),0); SendDlgItemMessage(hwndDlg,103,EM_SETLIMITTEXT,3,0); //tick checkbox CheckDlgButton(hwndDlg,401,BST_CHECKED); break; case WM_CLOSE: case WM_QUIT: // gcncryptKill(); break; case WM_COMMAND: switch(HIWORD(wParam)) { case BN_CLICKED: switch(LOWORD(wParam)) { case 201: //Decrypt // DecryptParseList(); break; case 202: //Encrypt // EncryptParseList(); break; case 301: //Close // gcncryptKill(); break; case 302: //Clear (input) SetDlgItemText(hwndDlg,101,""); break; case 303: //Clear (output) SetDlgItemText(hwndDlg,102,""); break; case 401: //Game ID: // SendDlgItemMessage(hwndDlg,103,EM_SETREADONLY,dogameid^1,0); // EnableWindow(GetDlgItem(hwndDlg,501),dogameid); break; } break; } break; } return FALSE; } int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hprevinstance, LPSTR lpcmdline, int ncmdshow) { MSG msg; RECT wndRect,dskRect; int w,h; ghInstance = hInstance; hWindow = CreateDialog(ghInstance,"MAIN",NULL,MainCallB); if (!hWindow) { MessageBox(NULL, "Could not create main dialog", "ERROR", MB_ICONERROR \| MB_OK); return 0; } //load and set dialog icons iWindow = LoadIcon(ghInstance,"ICON"); SendMessage(hWindow,WM_SETICON,ICON_BIG,(LPARAM)iWindow); SendMessage(hWindow,WM_SETICON,ICON_SMALL,(LPARAM)iWindow); //change title bar to include version number SetWindowText(hWindow, TITLEBAR); //center dialog on screen GetWindowRect(hWindow,&wndRect); GetWindowRect(GetDesktopWindow(),&dskRect); w = (wndRect.right-wndRect.left); h = (wndRect.bottom-wndRect.top); MoveWindow(hWindow,((dskRect.right/2)-(w/2)),((dskRect.bottom/2)-(h/2)),w,h,TRUE); //display dialog ShowWindow(hWindow,ncmdshow); UpdateWindow(hWindow); while (hWindow) { if (GetMessage(&msg,NULL,0,0)) { TranslateMessage(&msg); DispatchMessage(&msg); } } return msg.wParam; } ELFedit.h: c Syntax (Toggle Plain Text) #include <windows.h> #include <stdio.h> #include <stdlib.h> #include <string.h> //win32 stuff #define TITLEBAR "ELF Edit v0.0" #define TEXTSIZE 32767 HWND hWindow; HINSTANCE ghInstance; HICON iWindow; HFONT hFont,hNewFont; #include <windows.h> #include <stdio.h> #include <stdlib.h> #include <string.h> //win32 stuff #define TITLEBAR "ELF Edit v0.0" #define TEXTSIZE 32767 HWND hWindow; HINSTANCE ghInstance; HICON iWindow; HFONT hFont,hNewFont; Main.rc: c Syntax (Toggle Plain Text) #include <windows.h> #define MAIN 1000 #define ELFDIS 1001 MAIN DIALOGEX 6,6,409,243 CAPTION "ELF Edit" FONT 8,"MS Sans Serif",0,0,0 STYLE WS_VISIBLE\|WS_OVERLAPPEDWINDOW BEGIN CONTROL "",ELFDIS,"ListBox",WS_CHILD\|WS_VISIBLE\|WS_TABSTOP\|LBS_NOINTEGRALHEIGHT\|LBS_HASSTRINGS\|LBS_NOTIFY,16,22,378,201,WS_EX_CLIENTEDGE END #include <windows.h> #define MAIN 1000 #define ELFDIS 1001 MAIN DIALOGEX 6,6,409,243 CAPTION "ELF Edit" FONT 8,"MS Sans Serif",0,0,0 STYLE WS_VISIBLE\|WS_OVERLAPPEDWINDOW BEGIN CONTROL "",ELFDIS,"ListBox",WS_CHILD\|WS_VISIBLE\|WS_TABSTOP\|LBS_NOINTEGRALHEIGHT\|LBS_HASSTRINGS\|LBS_NOTIFY,16,22,378,201,WS_EX_CLIENTEDGE END

Jun 2nd, 2008, 5:28 PM	#2
The Dark Expert Programmer Join Date: Jun 2005 Posts: 852 Rep Power: 4	Re: Need help getting an API app started/working You should return TRUE in your callback function when you handle a message, this might be causing the problem, as Windows thinks you haven't handled the INITDIALOG message. You can use GetLastError and FormatMessage after the CreateDialog call fails to get a more detailed error description, it might point you in the right direction.

Jun 3rd, 2008, 12:47 PM	#3
Viper187 Newbie Join Date: Jun 2008 Posts: 2 Rep Power: 0	Re: Need help getting an API app started/working I finally found a good tutorial to work from. http://www.winprog.org/tutorial/ Now I'd love it if someone could tell me how inline assemblers work. Is it possible to enable editing a single row in a listbox? Or is it some special grid/excel spreadsheet-like control?

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Programming Forums > Application Development > C

Need help getting an API app started/working