사용자 콤퓨터가 어떤 상태인지에 맞춰 스크린샷(화면캡쳐) 이미지 저장하기.

//---------------------------------------------------------------------------
bool __fastcall TForm1::isWorkstationLocked()
{
    HDESK hDesktop = OpenDesktopW(L"default", 0, FALSE, DESKTOP_SWITCHDESKTOP);
    if (hDesktop != 0)
    {
        bool result = !SwitchDesktop(hDesktop);
        CloseDesktop(hDesktop);
        return result;
    }
    return false;
}
//---------------------------------------------------------------------------
bool __fastcall TForm1::screenCapture_myApplication(String stFileName)
{
    TImage *ImageCAPTURE = new TImage(NULL) ;
    TJPEGImage *jpgImage = new TJPEGImage() ;
    bool bl_return ;
    bl_return = true ;

    // Check if the system locked
    bool bl_isLocked = this->isWorkstationLocked() ;  // 잠금모드인지 확인.

    try {
        if (bl_isLocked) {      // 잠금 상태면 내 프로그램 이미지만 저장.
            HDC hdHandle = GetWindowDC(this->Handle) ;

            ImageCAPTURE->Width  = this->Width ;
            ImageCAPTURE->Height = this->Height ;
            ImageCAPTURE->Picture->Bitmap = NULL ;
            BitBlt(ImageCAPTURE->Canvas->Handle, 0, 0, this->Width, this->Height, hdHandle, 0, 0, SRCCOPY) ;

        } else {                // 사용 중인 상태면 전체 스크린 이미지 저장 (만약 화면 잠금상태에서 아래코드가 작동되면 하얀(또는 까만) 이미지만 자장됨.)
           
            ImageCAPTURE->Width  = Screen->Width ;
            ImageCAPTURE->Height = Screen->Height ;
            ImageCAPTURE->Picture->Bitmap = NULL ;
            BitBlt(ImageCAPTURE->Canvas->Handle, 0, 0, Screen->Width, Screen->Height, GetDC(0), 0, 0, SRCCOPY) ;
        } ;
        jpgImage->CompressionQuality = 100 ;
        jpgImage->Assign(ImageCAPTURE->Picture->Bitmap) ;
        jpgImage->SaveToFile(stFileName) ;
    } catch(...) {
        bl_return = false ;
    } ;

    delete ImageCAPTURE ;
    delete jpgImage ;

    return bl_return ;

}

// 사용 방법
//---------------------------------------------------------------------------
void __fastcall TForm1::Button1Click(TObject *Sender)
{
    String stFilename ;
    stFilename = "myScreenshot_" + Now().FormatString("yyyy_mm_dd-hhnnss") + ".jpg" ;
    this->myScreenCapture( stFilename ) ;
}
//---------------------------------------------------------------------------