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oib111
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Posts: 2947
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 Posted: Fri May 09, 2008 9:06 am Post subject: [vsc++]win32 problem |
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Ok. Whenever I try making a Win32 Application with VC++ it always gives me some error that my other compiler doesn't. Even when I'm not even doing anything. Like right now, I tested it with just a plain old skeleton cold to just make a window, that's it, and it still gave me an error. This is the code I'm using:
| Code: |
#include <windows.h>
/* Make the class name into a global variable */
char szClassName[ ] = "WindowsApp";
int WINAPI WinMain (HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
HWND hwnd; /* This is the handle for our window */
MSG messages; /* Here messages to the application are saved */
WNDCLASSEX wincl; /* Data structure for the windowclass */
/* The Window structure */
wincl.hInstance = hThisInstance;
wincl.lpszClassName = szClassName;
wincl.lpfnWndProc = WindowProcedure; /* This function is called by windows */
wincl.style = 0; /* Catch double-clicks */
wincl.cbSize = sizeof (WNDCLASSEX);
/* Use default icon and mouse-pointer */
wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName = NULL; /* No menu */
wincl.cbClsExtra = 0; /* No extra bytes after the window class */
wincl.cbWndExtra = 0; /* structure or the window instance */
/* Use Windows's default color as the background of the window */
wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
/* Register the window class, and if it fails quit the program */
if (!RegisterClassEx (&wincl))
{
MessageBox(NULL, "Window Registration Failed!", "Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}
/* The class is registered, let's create the program*/
hwnd = CreateWindowEx (
0, /* Extended possibilites for variation */
szClassName, /* Classname */
"Windows App", /* Title Text */
WS_OVERLAPPEDWINDOW, /* default window */
CW_USEDEFAULT, /* Windows decides the position */
CW_USEDEFAULT, /* where the window ends up on the screen */
544, /* The programs width */
375, /* and height in pixels */
NULL, /* The window isn't a child */
NULL, /* No menu */
hInstance, /* Program Instance handler */
NULL /* No Window Creation data */
);
if(hwnd == NULL)
{
MessageBox(NULL, "Window Creation Failed!", "Error!",
MB_ICONEXCLAMATION | MB_OK);
return 0;
}
/* Make the window visible on the screen */
ShowWindow (hwnd, nCmdShow);
UpdateWindow(hwnd);
/* Run the message loop. It will run until GetMessage() returns 0 */
while (GetMessage (&messages, NULL, 0, 0) > 0)
{
/* Translate virtual-key messages into character messages */
TranslateMessage(&messages);
/* Send message to WindowProcedure */
DispatchMessage(&messages);
}
/* The program return-value is 0 - The value that PostQuitMessage() gave */
return messages.wParam;
}
/* This function is called by the Windows function DispatchMessage() */
LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message) /* handle the messages */
{
case WM_CREATE:
case WM_CLOSE:
DestroyWindow(hwnd);
case WM_DESTROY:
PostQuitMessage(0); /* send a WM_QUIT to the message queue */
break;
default: /* for messages that we don't deal with */
return DefWindowProc (hwnd, message, wParam, lParam);
}
return 0;
}
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And these are the errors it gives me...
| Quote: |
------ Build started: Project: test, Configuration: Debug Win32 ------
Compiling...
main.cpp
c:\documents and settings\oib\my documents\visual studio 2008\projects\test\test\main.cpp(17) : error C2065: 'hThisInstance' : undeclared identifier
c:\documents and settings\oib\my documents\visual studio 2008\projects\test\test\main.cpp(1 : error C2440: '=' : cannot convert from 'char [11]' to 'LPCWSTR'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
c:\documents and settings\oib\my documents\visual studio 2008\projects\test\test\main.cpp(19) : error C2065: 'WindowProcedure' : undeclared identifier
c:\documents and settings\oib\my documents\visual studio 2008\projects\test\test\main.cpp(37) : error C2664: 'MessageBoxW' : cannot convert parameter 2 from 'const char [28]' to 'LPCWSTR'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
c:\documents and settings\oib\my documents\visual studio 2008\projects\test\test\main.cpp(55) : error C2664: 'CreateWindowExW' : cannot convert parameter 2 from 'char [11]' to 'LPCWSTR'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
c:\documents and settings\oib\my documents\visual studio 2008\projects\test\test\main.cpp(60) : error C2664: 'MessageBoxW' : cannot convert parameter 2 from 'const char [24]' to 'LPCWSTR'
Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
Build log was saved at "file://c:\Documents and Settings\OIB\My Documents\Visual Studio 2008\Projects\test\test\Debug\BuildLog.htm"
test - 6 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
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And my other compiler doesn't give me any errors with this code.
_________________
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Ferocious
Advanced Cheater
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Joined: 06 Feb 2008
Posts: 54
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| Posted: Fri May 09, 2008 9:11 am Post subject: |
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this is because, visual studio compiles it in UNICODE. convert all your strings to unicode, or compile as multi-byte.
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tombana
Master Cheater
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Joined: 14 Jun 2007
Posts: 456
Location: The Netherlands
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| Posted: Fri May 09, 2008 9:22 am Post subject: Re: [vsc++]win32 problem |
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Hi, I don't know all but I know some of the problems:
1. | Code: | | wincl.hInstance = hThisInstance; |
Should be | Code: | | wincl.hInstance = hInstance; |
2. You should declare WindowProcedure at the top of you're file (before any functions):
| Code: | | LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam); |
3. | Code: | | char szClassName[ ] = "WindowsApp"; |
Should be changed to | Code: | | char* szClassName = "WindowsApp"; |
(Or change the code and put &szClassName)
4. I don't know so much about unicode and ascii and multibyte or whatever it's called in C++, but I think you have to prefix the strings with L or something: (The error tells you're using the unicode version of MessageBox, so you might try MessageBoxA (ascii))
| Code: | | MessageBox(NULL, L"Window Registration Failed!", "Error!",.... |
5. CreateWindowEx: same as at 4.
EDIT: Or change it at you're options, like Ferocious said.
I hope this helped you.
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Noz3001
I'm a spammer
 Reputation: 26
Joined: 29 May 2006
Posts: 6220
Location: /dev/null
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| Posted: Fri May 09, 2008 10:15 am Post subject: |
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| tombana's number 3 isn't really needed and to change the strings to unicode shove a L before the text or put it in _TEXT().
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oib111
I post too much
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Joined: 02 Apr 2007
Posts: 2947
Location: you wanna know why?
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| Posted: Fri May 09, 2008 4:46 pm Post subject: |
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Oh yeah the hInstance thing. I fixed that. But I Use a skeleton and I forgot to change the skeleton...so yeah. But normally that wouldn't be there.
_________________
| 8D wrote: |
cigs dont make people high, which weed does, which causes them to do bad stuff. like killing |
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killersamurai
Expert Cheater
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Joined: 10 Sep 2007
Posts: 197
Location: Colorado
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| Posted: Fri May 09, 2008 5:24 pm Post subject: |
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| The program will never run. It will, but it will end as soon as RegisterClassEx is called. Since there is no break on WM_CREATE, it will be treated as WM_CLOSE. Then, it will go to WM_DESTROY.
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oib111
I post too much
Reputation: 0
Joined: 02 Apr 2007
Posts: 2947
Location: you wanna know why?
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| Posted: Fri May 09, 2008 5:30 pm Post subject: |
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Btw, how do I use the window background that delphi and VSC++ uses (VSC++ when your doing a UI form and not Win32 APIs)
_________________
| 8D wrote: |
cigs dont make people high, which weed does, which causes them to do bad stuff. like killing |
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