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manc
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Posts: 551
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 Posted: Thu Aug 28, 2008 11:30 pm Post subject: [C++]PostMessage function.. |
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Trying to get familiar with win32 api / postmessage function. I simply wish to send a message to notepad.
| Code: | #include <windows.h>
using namespace std;
void main()
{
HWND hWnd = FindWindow( NULL, "Untitled - Notepad" );
HWND hWndChild = FindWindowEx( hWnd, NULL, "Edit", NULL );
PostMessage( hWndChild, WM_KEYDOWN, 0x5A, 0x5A );
} |
Major Error:
MSVCRTD.lib(crtexew.obj) : error LNK2019: unresolved external symbol _WinMain@16 referenced in function ___tmainCRTStartup
C:\Documents and Settings\Matt\Desktop\TestPM\Debug\TestPM.exe : fatal error LNK1120: 1 unresolved externals
Build log was saved at "file://c:\Documents and Settings\Matt\Desktop\TestPM\TestPM\Debug\BuildLog.htm"
TestPM - 2 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
Not sure whats wrong here.
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kitterz
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| Posted: Thu Aug 28, 2008 11:53 pm Post subject: |
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int main();
return 0;
I think.
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manc
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Posts: 551
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| Posted: Thu Aug 28, 2008 11:59 pm Post subject: |
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| Quote: | MSVCRTD.lib(crtexew.obj) : error LNK2019: unresolved external symbol _WinMain@16 referenced in function ___tmainCRTStartup
C:\Documents and Settings\Matt\Desktop\TestPM\Debug\TestPM.exe : fatal error LNK1120: 1 unresolved externals
Build log was saved at "file://c:\Documents and Settings\Matt\Desktop\TestPM\TestPM\Debug\BuildLog.htm"
TestPM - 2 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== |
Tried and got that.down to 1 error..
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hcavolsdsadgadsg
I'm a spammer
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Posts: 5801
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| Posted: Fri Aug 29, 2008 12:18 am Post subject: |
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Are you doing something funky to try and avoid the CRT?
Otherwise, check your subsystem setting in the linker settings and make sure it's set appropriately.
If you're still having trouble for some reason, the linker is expecting mainCRTStartup, so create your own function and you will be fine.
Last edited by hcavolsdsadgadsg on Fri Aug 29, 2008 3:27 am; edited 1 time in total |
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Symbol
I'm a spammer
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Joined: 18 Apr 2007
Posts: 5094
Location: Israel.
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| Posted: Fri Aug 29, 2008 3:21 am Post subject: |
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| Change "main" to "WinMain" or change the entry point at settings -> Linker -> Advanced.
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Renkokuken
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| Posted: Fri Aug 29, 2008 4:14 am Post subject: |
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| Your linker options are set to SUBSYSTEM:WINDOWS, while you're trying the entry point of a CONSOLE application. Either change the subsystem, or make it a WinMain entry point.
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manc
Grandmaster Cheater
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| Posted: Fri Aug 29, 2008 1:50 pm Post subject: |
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| Code: | #include <windows.h>
#include <iostream>
using namespace std;
int sendmsgplz()
{
HWND hWnd = FindWindow( NULL, "Untitled - Notepad" );
HWND hWndChild = FindWindowEx( hWnd, NULL, "Edit", NULL );
PostMessage( hWndChild, WM_KEYDOWN, 0x5A, 0x5A );
return 0;
} |
Still same external linker error.... :[
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lurc
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| Posted: Fri Aug 29, 2008 1:58 pm Post subject: |
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You created the project as a windows application, meaning the main entry point has to be WinMain as Symbol and Renko have mentioned.
Also the lParam of WM_KEYDOWN is the scan-code, repeat-count, etc. You can just leave it at 0. Also if your just gonna send a char to the edit then use WM_CHAR instead.
Heres how it should look:
| Code: | #include <windows.h>
#include <tchar.h>
BOOL APIENTRY _tWinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nShowCmd )
{
UNREFERENCED_PARAMETER( hInstance );
UNREFERENCED_PARAMETER( hPrevInstance );
UNREFERENCED_PARAMETER( lpCmdLine );
UNREFERENCED_PARAMETER( nShowCmd );
HWND hWnd = FindWindow( _T("Notepad"), NULL ); // Use the class instead.
if ( hWnd != NULL )
{
HWND hChild = FindWindowEx( hWnd, NULL, WC_EDIT, NULL );
if ( hChild != NULL )
PostMessage( hChild, WM_CHAR, (WPARAM)'Z', 0 );
}
return 0;
} |
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manc
Grandmaster Cheater
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Posts: 551
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| Posted: Sat Aug 30, 2008 9:49 am Post subject: |
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| lurc wrote: | You created the project as a windows application, meaning the main entry point has to be WinMain as Symbol and Renko have mentioned.
Also the lParam of WM_KEYDOWN is the scan-code, repeat-count, etc. You can just leave it at 0. Also if your just gonna send a char to the edit then use WM_CHAR instead.
Heres how it should look:
| Code: | #include <windows.h>
#include <tchar.h>
BOOL APIENTRY _tWinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nShowCmd )
{
UNREFERENCED_PARAMETER( hInstance );
UNREFERENCED_PARAMETER( hPrevInstance );
UNREFERENCED_PARAMETER( lpCmdLine );
UNREFERENCED_PARAMETER( nShowCmd );
HWND hWnd = FindWindow( _T("Notepad"), NULL ); // Use the class instead.
if ( hWnd != NULL )
{
HWND hChild = FindWindowEx( hWnd, NULL, WC_EDIT, NULL );
if ( hChild != NULL )
PostMessage( hChild, WM_CHAR, (WPARAM)'Z', 0 );
}
return 0;
} |
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Error - "WC_EDIT" is an undeclared identifier.
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HomerSexual
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Posts: 1657
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| Posted: Sat Aug 30, 2008 9:52 am Post subject: |
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| manc wrote: | | lurc wrote: | You created the project as a windows application, meaning the main entry point has to be WinMain as Symbol and Renko have mentioned.
Also the lParam of WM_KEYDOWN is the scan-code, repeat-count, etc. You can just leave it at 0. Also if your just gonna send a char to the edit then use WM_CHAR instead.
Heres how it should look:
| Code: | #include <windows.h>
#include <tchar.h>
BOOL APIENTRY _tWinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nShowCmd )
{
UNREFERENCED_PARAMETER( hInstance );
UNREFERENCED_PARAMETER( hPrevInstance );
UNREFERENCED_PARAMETER( lpCmdLine );
UNREFERENCED_PARAMETER( nShowCmd );
HWND hWnd = FindWindow( _T("Notepad"), NULL ); // Use the class instead.
if ( hWnd != NULL )
{
HWND hChild = FindWindowEx( hWnd, NULL, WC_EDIT, NULL );
if ( hChild != NULL )
PostMessage( hChild, WM_CHAR, (WPARAM)'Z', 0 );
}
return 0;
} |
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Error - "WC_EDIT" is an undeclared identifier. |
Then look up what it should be instead of wanting him to hand you full code
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kb3z0n
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Posts: 542
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| Posted: Sat Aug 30, 2008 2:37 pm Post subject: |
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| Lol, this is why i stick to delphi.
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DeletedUser14087
I post too much
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Joined: 21 Jun 2006
Posts: 3069
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| Posted: Sat Aug 30, 2008 3:14 pm Post subject: |
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| NULL lparam, read more about notifications @ MSDN
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lurc
Grandmaster Cheater Supreme
Reputation: 2
Joined: 13 Nov 2006
Posts: 1900
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| Posted: Sat Aug 30, 2008 3:44 pm Post subject: |
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Oh yea, forgot to #include <commctrl.h> for WC_EDIT...
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