查找要在FindWindow wniapi C ++中使用的已启动应用程序的lpClassName？

Question

How can i find the lpClassName string of the FindWindow API call if i start application with CreateProcess API function

PROCESS_INFORMATION ProcessInfo; //This is what we get as an [out] parameter

STARTUPINFO StartupInfo; //This is an [in] parameter

ZeroMemory(&StartupInfo, sizeof(StartupInfo));
StartupInfo.cb = sizeof StartupInfo ; //Only compulsory field

if(CreateProcess("c:\\temp\\application1.exe", NULL,
NULL,NULL,FALSE,0,NULL,
NULL,&StartupInfo,&ProcessInfo))
{
WaitForSingleObject(ProcessInfo.hProcess,INFINITE);
CloseHandle(ProcessInfo.hThread);
CloseHandle(ProcessInfo.hProcess);
}
else
{
MessageBox("The process could not be started...");
}

also can i some how set only part of the name in the FindWindow ? for example if i know that allays the app name is "application< some version number>.exe" so it can be :
application1.exe
application1.1.exe
application1.2.1.exe

my final goal is to use Windows Message system and the SendMessage API method to send messages to the application.

Answer 1

It sounds like what you really want is the handle to the window created by your launched application.

The problem is, your process might create many windows. You can use the SetWindowsHookEx function to be notified whenever the process creates a new window.

Untested code incoming:

LRESULT CALLBACK CBTProc(int nCode,  WPARAM wParam,  LPARAM lParam) {
    if(nCode == HCBT_CREATEWND) {
        // wParam is a handle to a window your app just created.
    }
    return 0;
}

CreateProcess("c:\\temp\\application1.exe", NULL,
    NULL,NULL,FALSE,CREATE_SUSPENDED,NULL,
    NULL,&StartupInfo,&ProcessInfo);

SetWindowsHookEx(WH_CBT, procHook, NULL, ProcessInfo.hThread);

ResumeThread(ProcessInfo.hTread);