Hi Thanks.. it worked.... Deepak

Thanks.. It still isnt working though.. I have passed an LPARAM value of 0 into the function.. Would this matter?? D

Hi all, I am relatively new to api programming.I am trying to automate a process and am using EnumWindows to get all window handles. I am then using GetWindowText and strcmp to check which of the window handles corresponds to the relevent window. However it doesnt seem to work i.e., it doesnt simulate the push of the button.... I have pasted the code snippet below.. Any suggestions on how to resolve this will be terrific. In the main program i have EnumWindows((WNDENUMPROC) WinCallback, 0); My function is: BOOL CALLBACK WinCallback(HWND win, LPARAM nadda) { char temp[512]; GetWindowText(win, temp, 512); printf("%s",temp); if(!strcmp(temp,"RBNal_Optocomm")) { HWND hcomm = FindWindowEx((HWND) win,NULL,"BUTTON","COM 1"); LRESULT lResult2; lResult2 = SendMessage((HWND) hcomm,(UINT) BM_CLICK,0,0); return FALSE; } } Please let me know of any suggestions. D