error '' was not declared in this scope

[davinciomar]

i declared since .cpp file webcamwin.cpp
http://pastebin.com/6XsePmSs
Sorry for changing the theme but i tried to compile again and the above error was solved. But at the moment i have one little question about one similar error:
error: 'capCreateCaptureWindowA' was not declared in this scope ::hwndVideo = capCreateCaptureWindowA("captura",WS_POPUP ,1,1 ,240 ,320,NULL,0);
The file is the same: http://pastebin.com/6XsePmSs
^

[d_stranz]

error: 'capCreateCaptureWindowA' was not declared in this scope ::hwndVideo = capCreateCaptureWindowA("captura",WS_POPUP ,1,1 ,240 ,320,NULL,0);

This looks like native Windows code; it has nothing to do with Qt. You have probably forgotten to #include the ".h" file where this function is declared.